ssg ch07/99-114 (page 99) - siemens · nema 3r construction. switchboard distribution sections all...

Whether the design is for a 240V AC,400 ampere system; a 600V AC, 4000ampere system; or something inbetween, Siemens Switchboards shouldbe considered. Every aspect of designhas been aimed at improving layout con-venience, reducing installation costs, andminimizing the impact and cost of sys-tem changes. These switchboards pro-vide the rugged construction and serviceflexibility necessary in systems for indus-trial plants, hi-rise complexes, hospitals,and commercial buildings, and are built toUL-891 and NEMA PB-2 standards.

Type SB1 for Limited SpaceApplications

The SB1 switchboard has been specifi-cally designed for those applicationswhere floor space is at a premium. Therear of all sections align so the switch-board can be installed against a wall. TheSB1 contains front-connected main pro-tective devices and through-bus ratingsup to 2000 amperes at 600V AC.

Type SB2 for Increased Service andMore Load Cable Room

Siemens SB2 switchboard can have extradepth behind the vertical bus in each dis-tribution section, and contains main pro-tective devices and through-bus rated upto 4000 amperes at 600V AC. The rear ofall sections align as a standard. Front andrear alignment is available as an option.

Type SB3 For Custom Options

The SB3 switchboard is available withmain bus up to 6000 amperes. All sec-tions are front and rear aligned. Optionsinclude, but are not limited to, incomingand outgoing busway, SiemensACCESS™ System communications,aand cold sequence utility C.T.Compartments.

Type RCIII Rear ConnectedSwitchboards

The RCIII switchboard differs from theSB3 switchboard primarily in the mount-ing of the devices in the distribution sec-tion. The branch and feeder devices areindividually mounted. Because of thismethod of mounting, access to outgoingcable terminations must be from the rearof the switchboard. Bus bar extensionsfrom the feeder devices are run back tothe rear of the unit for easy access.

The front and rear of all sections align,designed for mounting away from thewall. RCIII switchboards will accommo-date systems up to 6000 amperes, 600volts maximum in any three-phase three-wire or three-phase four-wire configura-tion. The main bus can be specified for600 to 6000 ampere rating. Main devicesand bus ties are available up to 5000amperes, branch devices up to 2000amperes. As with Type SB3, the RCIIIswitchboard can be of indoor or outdoorNEMA 3R construction.

Switchboard Distribution Sections

All standard distribution sections are 90 in.(2286) mm) high and 38 in. (965 mm)wide. Optional height of 70 in. (1778 mm)and optional width of 32 in. (813 mm) and46 in. (1168 mm) are also available. SB1 distribution sections are 20 in. (508 mm) deep. For deeper sections, SB2and SB3 switchboards must be chosen.SB2 distribution sections have a standarddepth of 20 in. (508 mm) but can also bespecified in depth of 28 in. (711 mm) and38 in. (965 mm) when additional space isrequired. Rear access is required to makeuse of the additional depth of the SB2 andSB3 switchboards, and to provide accessto bus connections, where required. SB2may be installed against a wall. a See Section 1 of this Guide for a complete discussion of

Siemens ACCESS™ system.

Sentron™ SwitchboardsTypes SB1, SB2, SB3 and RCIII

99CSI Section 16470 Siemens Electrical Products and SystemsSpecification Guide

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Type SB1 Switchboard Pictorial

Type SB2 Switchboard Pictorial

Sentron™ SwitchboardsTypes SB1, SB2, SB3, and RCIII

General

100 CSI Section 16470Siemens Electrical Products and SystemsSpecification Guide

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RCIII Switchboard –– Fixed MountedDevices

RCIII Switchboard –– Drawout MountedDevices

Switch-boardType

InstallAgainstWall?

SB1

SB2

SB3

RCIII

to 2000 Front Front YesYesNoNo

FrontRearRear

FrontFrontRear

to 4000to 6000to 6000

Main Bus AmpereRating Connected Access

Table 7.1 General

a Distribution section with two high 800 or 1200AVacu- Break is 28 in. (711 mm) deep.

b Distribution section with two high bolted pressureswitch is 38 in. (965 mm) deep minimum.

c

d

e

Width depends on branch device. See page 128.Fixed mounted only.Drawout or fixed mounted.

Switch-boardType

Molded CaseCircuitBreakerFixed

Vacu-BreakFusibleSwitchFixed

BoltedPressureFusible SwitchFixed

HCPFusibleSwitch

InsulatedCaseBreaker

LVPowerCircuitBreaker

SB1

SB2

SB3

RCIII

Yes

Yes

Yes

Yes

400-2000A400-1200A400-3200A400-1200A400-3200A400-1200A400-3200A

Yes

Yes

YesNo

800-1200A400-600A400-1200A400-600A400-1200A400-600A400-1200A

400-1200A400-1200A400-1200A400-1200A400-1200A400-1200A400-1200A

800-2000A—800-4000A—800-4000A—800-4000A

—

800-4000A d

800-5000A e

800-5000AFixed /Drawout

—

—

—

800-4000ADrawout

Table 7.2 Main Devices

Mounting

Individual Panel

Switch-boardType

Molded CaseCircuitBreakerFixed

Vacu-BreakFusibleSwitchFixed

BoltedPressureFusible SwitchFixed

HCPFusibleSwitch

InsulatedCaseBreaker

LVPowerCircuitBreaker

SB1

SB2

SB3

RCIII

NoYes

Yes

Yes-Rear

15-1200A—15-1200A400-3000A

15-1200A100-2000A

Yes

Yes

YesNo

30-600A800-1200A30-600A800-1200A

30-600A100-1200A

400-1200A400-1200A400-1200A400-1200A

400-1200A400-1200A

———800-4000A

—800-4000A

———

—

800-2000A e—

800-4000AFixed /Drawout

——

—

800-1600ADrawout

Table 7.3 Branch Devices

Mounting

Individual Panel

Switch-boardType

SB1

SB2

SB3

RCIII

Front

Front

Front &Rear

Rear

—90 (2286) 38 (965) 32 or 46(813 or 1168)

20 (508) —

—90 (2286) 38 (965) 32 or 46(813 or 1168)

20 (508) a 28 or 38(711 or 965) a

70 (1778)90 (2286) 38 (965) 32 or 46(813 or 1168)

20 (508) a b 28, 38, 48, or 58(711, 965, 1219 or 1473) a b

70 (1778)90 (2286) 25, 32, 38,(635, 813,or 965) c

32 or 46(813 or 1168)

48 or 58(1219 or 1473)

—

Table 7.4 Distribution Sections

Height Width Depth

Dimensions in inches (mm)

Access Std. Opt. Std. Opt. Std. Opt.

—

—

—

—

Service SectionsBussed or Non-Bussed Pull Sections

With Siemens switchboards, a non-bussed pull section, or a cross-bussedpull section for underground feed can be selected. The unique cross-bussedsection permits cable to be run straightfrom underground to the bus bars at thetop of the section. Non-bussed pull sec-tions have openings for carrying theunderground feed cables to the servicesection bus.Typical switchboards consist of a servicesection, and one or more distribution sec-tions. Service sections can be fed directlyfrom overhead by cable or busway.When fed from underground, a separatepull section is usually added. The servicesection is then fed from the adjacentunderground pull section. Bolted Pressure Switches, Vacu-Break®

and HCP Switches equipped for bottomfeed will accept cable directly fromunderground into the service section.

Service Section Options UtilityMetering

In addition to the main disconnect, theservice section usually contains utilitymetering provisions. ”Hot“ metering(CT‘s on the line side of the main discon-nect) is normal, but ”cold“ metering pro-visions (CT‘s on the load side of the maindisconnect) can also be furnished. Whether hot or cold metering is required,the CT’s provided by the utility companywill be mounted in a completely separatecompartment. The compartment will bebuilt to utility company standards, withhinged doors and provisions for meteringequipment provided by the utility.

Customer Metering

The service section often provides space for many user instrument require-ments. Ammeters, voltmeters, and theirassociated selector switches can bemounted in the service section along

with the main disconnect. A separatesection would be needed only if a largeinstrument or an unusual number ofinstruments were required.

Main Disconnect OptionsMain protective devices can be mountedindividually for quick access in an emer-gency. Switchboards will accommodate avariety of main protective devices.Selection depends on the characteristicsof each electrical system.

Type RL Power Circuit Breakers

Power circuit breakers, 800 – 5000amperes, 600 volts AC, with solid-stateovercurrent trip devices offer stored-energy tripping plus optional ground faultprotection, selective tripping, and a broadrange of accessories.

Type SB Encased Systems Breakers

Insulated case circuit breakers, 800 – 5000amperes, 600 volts AC, with solid-statetrip devices, offer stored energy trippingplus optional ground fault protection,selective tripping, and a broad range ofaccessories.

Molded Case Circuit BreakersHeavy Duty

Standard interrupting capacity, thermal-magnetic breakers, 400 – 2000 amperes,600 volts AC, provide protection thatallows “immediate restoration of power”for normal system requirements. A widerange of accessory options is available,including shunt trip, motor operator, auxil-iary switches, alarm switches, and others.

Extra Heavy Duty Breakers

High-interrupting-capacity thermal-magnetic breakers, 400 – 2000 amperes,600 volts AC, provide increased protec-tions where high available fault currentsexist, with the same convenience andaccessory feature offered in standardinterrupting capacity breakers.

Solid-State Sensitrip®

Full function breakers 400 – 3200amperes, 600 volts AC, have solid-statecircuitry which assures minimal damagethrough the quick interruption control offault currents, and includes short-timedelay and ground fault trip for branchdevice coordination.

Fuseless Current Limiting

Molded case breakers, 400 – 1600amperes, 600 volts AC, with thermal-magnetic protection provide coordinatedprotection for branch devices and circuitswhere extremely high fault currents areavailable. Solid state current limitingmolded case breakers also available inratings of 400 – 1600A.

Fusible Switches

Vacu-Break® Fusible Switches, 400 – 1200amperes, 600 volts AC, provide protec-tion, coordination with branch protectivefusible switches, and application flexibilityin systems where high available fault currents are encountered.

HCP Fusible Switch

HCP switches, 400 – 1200 amperes, 600 volts AC, combine economy withextremely high interrupting capacity inconjunction with Class J and Class Lfuses. Has visible contacts and optionalauxiliary contacts, shunt trip and groundfault relaying.

Bolted Pressure Switches

Bolted pressure switches, 800 – 4000amperes, 480 volts AC, combine econ-omy with extremely high interruptingcapacity in conjunction with Class Lfuses. Options include short trip, groundfault relaying, and a wide range of otheraccessories.

Ground Fault Relays

All main protective devices, except Vacu-Break fusible switches, can beequipped with ground fault relays tocomply with the National Electrical Code(Section 230-95) ground fault protectionrequirements.

Sentron™ SwitchboardsTypes SB1, SB2, SB3, and RCIII


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Type RL, LV Power Circuit Breaker

Customer Metering Compartment

Type SB Encased Systems Breaker

Bus Bars Design

Siemens switchboard bus bars are avail-able in standard tin-finished aluminum oroptional silver-finished copper. Standardbus is sized to limit heat rise to 65°Cabove an ambient temperature of 40°Cmaximum in accordance with UL 891.As an option, conductor material can besized according to density limits, basedon bus material. The applicable limits are:Aluminum — 750 amperes / sq. in.Copper — 1000 amperes / sq. in.In accordance with NEMA and UL 891standards, at each distribution section,the through-bus capacity is reduced asload is taken off. The through-bus istapered to a minimum of one-third theampacity of the incoming service mains. If required by special system characteris-tics, switchboards can be supplied withoptional full-capacity bus; i.e., the ampac-ity of the through-bus remains at the fullampacity of the main throughout theswitchboard.

Splice Plates

All splice plates can be accessed, bolted,and unbolted from the front of theswitchboard to make connection of adjacent sections easy. Each splice plateis attached with one 1/2-inch grade 2bolt, and a 2-inch or 3-inch Belville washer on each end. This reduces instal-lation time while increasing contact pressure at the joint. To make installation and servicing of thesplice plates easier, all phase and neutralthrough-busses are stacked one abovethe other, eliminating the need to stuffbolts in between bus bars that arestacked one behind the other in thesame horizontal plane.

Disconnect Links in Service EntranceEquipment

In switchboard service sections to beused as service entrance equipment on1Ø3W and 3Ø4W systems, provisionsmust be included to isolate the neutralbus from the grounded service neutral.This removable link gives you the abilityto check branch neutral continuity on theload side of the main disconnect. To maintain a service ground to theswitchboard frame while the neutral link is removed, a bonding strap is con-nected from the switchboard frame tothe neutral bus on the line side of theremovable link. UL and “SUSE” (suitable for use as ser-vice entrance) labels will be furnished on

service sections specified for serviceentrance.

Cable Terminals

Screw mechanical connectors (lugs) areprovided as standard equipment on alldevices. However, compression connec-tors are available as an option on all mainlugs, main bolted pressure switches,main power circuit breakers, mainmolded case, main fusible devices, andmain insulated case circuit breakers.

Distribution Sections

Siemens switchboard distribution sec-tions are engineered for accessibility andexpanded use. For expanded wiring roomand exceptional accessibility, generoustop and bottom gutters have been cre-ated by locating through-bus in the rearcenter of the distribution section. In cableentrance sections, no obstructions areless than 8 in. (203 mm) above the floor,and no live bus bars are located less than10 in. (254 mm) off the floor. So there isplenty of room to run cables into the dis-tribution section for connections. Standard bolted gutter covers give com-plete access to load conductors. Optionalhinged gutter covers can be furnishedwhere quick access to load connectors isdesired. Heavy channels form a rigid ring at thebase and top of each section, and heavygauge structural members are used forthe vertical corner posts eliminatingencroachment of additional bracing intothe top and bottom gutter areas. To provide additional room for top loadcable routing where needed, pull boxextensions are available in heights of10,15, 20, 25, and 30 in. (254, 381, 508,and 762 mm) to mount on any standarddistribution section. Top plates on all sec-

tions are easily removed in the field fordrilling, punching, and cutting conduitentry holes. Because all distribution sections canaccommodate any combination of panel-mounted branch devices, includingmolded case circuit breakers, Vacu-Breakfusible switches, and motor starters,future system modifications are easier to handle without adding switchboardsections. To make additional distribution sectionseasier to install when they are necessary,the through-bus in each distribution sec-tion is extended, and the end is pre-drilled to accept splice plate bolts. To adda section to an existing switchboard, setthe new section flush against the side ofthe existing distribution section, and bolttogether the bus bar splice plates.

Sentron™ SwitchboardsFront-Connected Construction –– Types SB1, SB2, and SB3

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Bus Bars and Lug Construction Splice Plates

Screw Mechanical Connectors

Distribution Sections (cont’d)

Distribution sections of SB1, SB2, andSB3 switchboards can accept any combi-nation of molded case circuit breakersand fusible switches. If the system callsfor a mixture of these devices, there isthe option of grouping the devices in logi-cal patterns within a single section. Aseparate section is not needed for eachtype of device. And because all types ofdevices can be put in a single section,the total number of sections required inthe system can be reduced. For future modifications, devices can beadded or replaced as the system growsand changes. If a motor starter has to beadded after the installation, an entireswitchboard section need not be providedto house it. It can be installed in any distri-bution section with available unit space.

Operating Temperatures

All distribution sections contain louversboth at the top and bottom to assurecool operation in accordance with ULStandard 891.

Bus Location

All through-bus to adjoining sections islocated in the rear center of the distribu-tion section. This design provides large,unobstructed wiring gutters at the topand bottom of each section. Wiring takesless time and costs less to install.

Motor Starter Switchboards

Type SB3 switchboards offer a completeline of group-mounted starters that pro-vide a compact and convenient methodof combining power distribution and control circuits in one location. Motor starter units are available with fullybussed circuit breaker or fusible Vacu-Break units, factory-wired on the loadside to full voltage, non-reversing startersto reduce installation time. Type A wiring is standard without termi-nal blocks. The fusible switch, circuitbreaker, or starter unit is factory wired;however, control and load cabling is connected by the installer directly ontothe starter. Type B wiring is available as an option.Control wiring is brought out to terminalblocks and identified. Starter load termi-nals are conveniently located near thevertical wiring gutters and adjacent tocontrol terminal blocks. No wiring exter-nal to the unit is furnished. Type C wiring is not available in motorstarter switchboards.

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Front Connected Switchboards, Type SB1

RClll Construction Details —Distribution Feeder SectionSiemens Type RClll switchboard differsfrom front connected switchboards pri-marily in the distribution section. Thebranch and feeder devices are individuallymounted. Because of this method ofmounting, access to outgoing cable ter-minations must be from the rear. Bus barextensions from the feeder devices arerun back to the rear of the unit for easyaccess.

Molded Case Circuit BreakersFixed or Plug-in Individually MountedDevices

This design consists of a front sectionwhere the distribution devices aremounted, a bus section in the center, anda cable termination area in the rear. Thefront metal cover represents a groundedprotection for the operator at the front ofthe switchboard. The main through-busruns near the bottom of the switchboard.Section bus risers from the main bus arelocated in the center of the distributionsection with taps to branch breakers. The load side terminals of each frontmounted device are extended throughthe bus compartment into the rear cablecompartment. These bus extensions areinsulated where necessary as they pass

the main bus bars. Additional protectioncan be provided with optional barriersbetween devices and bus compartment,between individual devices, between busand cable compartment, and between

vertical sections. For further information on Siemensmolded case circuit breakers, see Section 17.

Type SB EncasedSystems BreakersDrawout or Fixed Mounted Devices

Insulated case circuit breakers are individ-ually mounted in their own compart-ments as standard. Metal barriers areprovided at the sides of each compart-ment and an insulation horizontal barrieris located between breakers in the samevertical section. Access is providedthrough a removable cover on fixedmounted breakers and a hinged accessdoor on drawout breakers.The insulated case circuit breaker draw-out assembly is a self-contained, integralunit that permits quick circuit breakerreplacement or inspection and mainte-nance of breakers without de-energizingthe entire switchboard. The easily acces-sible and maintainable spring loaded pri-mary disconnect fingers are mounted onthe breaker. The drawout assembly con-sists of a stationary frame and a movablecarriage to support the breaker. The sec-ondary disconnects for accessory controlcircuits are mounted on the movable car-riage. A matching set is mounted on the

stationary frame. The drawout design ofinsulated case circuit breakers makes itpossible to place the breaker in a fullywithdrawn, disengaged test, or engagedposition. The load side of each breakerhas bus bars extending into the rear cable

compartment. Additional protection canbe provided with optional barriersbetween the bus and cable compartmentand between vertical sections. For furtherinformation on Siemens SB breakers, seeSection 16.

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Front View

Type RClll Switchboard with Individually Mounted Molded Case Circuit Breakers

General

Rear View

Type RClll Switchboard with SB Encased Systems Breakers.



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Type RL Low Voltage Power Circuit Breakers

Incoming Service and Distribution Feeder Section for Type RL Drawout LV Power Circuit Breakers.

Front View of Incoming Service andDistribution Feeder Section

Rear View of Bus and Cable Compartmentof Feeder System –– Barriers Installed

Rear View of Bus and Cable Compartmentof Feeder System –– Barriers Removed

Rear ViewFront View

Distribution Feeder SectionType SB Encased Systems Breakers

TransformerConnection

Distribution Feeder Section

Drawout low-voltage power circuit break-ers are also individually mounted in theirown compartments as standard. Metalbarriers are provided at the sides and rearof each compartment and a horizontalmetal barrier is located between breakersin the same vertical sections. Access isprovided through a hinged metal door oneach breaker compartment.

Safe Closed-Door Drawout Mechanism

The low voltage power circuit breakercan be moved from “connect” through“test” to “disconnect” position withoutopening the door. In the “connect” posi-tion, both the primary and secondary dis-connects are engaged. In the “test”position, the primary disconnect termi-nals are disengaged; however, the sec-ondary disconnects are maintained topermit operation of the circuit breaker. Inthe “disconnect” position, the primaryand secondary disconnects are disen-gaged and separated a safe distancefrom the corresponding stationary termi-nals. In the “fully withdrawn” position,both primary and secondary contacts aredisconnected and the circuit breaker maybe inspected or removed for more com-plete accessibility. The load side of each breaker has busbars extending from the rear of the primary disconnect through the bus com-partment into the rear cable compart-ment. Additional optional barriers can beprovided between bus and cable com-partments and between vertical sections.

Testing

Testing conducted by Siemens includesboth production testing of switchboardsections for compliance with UL require-ments, and developmental, design verifi-cation, and quality control testing. Production tests check structural integrityand are performed on all switchboard sec-tions in accordance with UL procedures.A test voltage equal to twice the ratedvoltage plus 1000 volts (Vt = 2Vr + 1000)is applied for one minute to each switch-board section to check the integrity of theconductor and insulator materials, and theswitchboard assembly. These tests areperformed routinely to verify properequipment fabrication and assembly.

For more sophisticated design verificationand developmental testing a separate lab-oratory is used. This test lab is fullyinstrumented for advanced, multi-phaseelectrical test work over a wide range ofsystem conditions. Among the tasks performed is the deter-mination of heat rise at busway con-nections, and at protective deviceterminations on both line and load sides. All heat rise tests are conducted in strictaccordance with applicable UL standards.Heat rise data from the tests are care-fully compared to UL allowable levels.

Another important laboratory program isthe systematic verification of short circuitwithstand capabilities for all switchboardconductor materials. Switchboard bushas been thoroughly tested and is ULshort circuit withstand rated (UL File #E-22578). Switchboard sections withdesigns conforming to test specificationswill carry a label noting the short circuitcurrent withstand rating applicable to thatsection. For additional information onSiemens RL breakers, see pages 54-61.


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Type RCIII Cutaway Side View

Type RL Low Voltage Power Circuit Breakers (cont’d)

MeteringUtility Metering

Requirements for power company meter-ing and instrument transformer require-ments vary with serving utility. Typically,utility company current transformersrequire a 30 in. (762 mm) high compart-ment in SB1, SB2, SB3, and RCIII con-struction. Service sections meet mostutility metering standards.

Customer Metering

A full compartment of switchboard instru-ments with appropriate current trans-formers, potential transformers andselector switches are available in allSiemens switchboards. The meters and instrument switches aremounted on hinged panels with potentialtransformers and fuses behind the door.Current transformers are mounted on themain bus or, in the case of branch feedermetering, at the load terminals of thebranch protective device and normally donot require additional unit space.

4300, 4700 and 4720 Power Meters

The 4300 PowerMeter is provided as a standard meteringoption for SB1, SB2, SB3, and RCIIIswitchboards. Alter-nate metering optionsfor SB3 and RCIIIinclude the higher

accuracy 4700 Power Meter or analogmetering equipment if specified. The4300, 4700 and 4720 Power Meters aremicroprocessor-based, three-phasemeters that provide advanced features atan affordable price. These meters aredesigned as an alternative to full-featureddigital instrumentation packages, provid-ing highly accurate, reliable, transientsurge and hipot-withstand capabilities.Voltage and amperage measurementsare true RMS, including harmonics. The 4300, 4700 and 4720 Power Meterscan be configured to operate in Wye(Star), Delta, or single-phase voltagemodes. The meter is equipped to monitor

the measurements shown in Table 7.5.The display module has a high visibility,liquid crystal display (LCD). Functions but-tons display measured data, includingvolts, amperage, power function, all threevoltage and amperage phases. Replacing analog meters and selectorswitches, the two-module design simpli-fies wiring and reduces installation time.This makes the Power Meter ideallysuited for economical metering on three-phase industrial and commercial switch-boards. A communications port allowsthe power meter to be used as a stand-alone power monitoring station or as oneelement in a large energy-managementnetwork.When used as part of a SiemensACCESS installation, the 4300, 4700 and4720 Power Meters can communicatewith up to 128 ACCESS-compatibledevices. Using a direct PC connection ora dial-up modem, the module interfaceswith Siemens SIEServe™ on-line soft-ware that monitors any ACCESS compo-nent on the electrical distribution system.

Ammeters and Voltmeters (Analog)

Ammeters are switchboard type with±1% accuracy, 0 to 6000 amperes maxi-mum. The included instrument switchwill provide positions to read each phaseand will include an OFF position. Paneltype ammeters with ±3% accuracy, 800ampere maximum, can be furnished forbranch feeder metering to conservepanel space.Voltmeters are switchboard type with±1% accuracy, 0 to 600 volts AC. Theincluded instrument switch provides posi-tions to read each phase-to-phase voltageand each phase-to-neutral voltage, andhas an OFF position.

Current Transformers / PotentialTransformers

Potential transformers are recommendedwherever the system voltage exceeds150 volts AC phase-to-neutral to lowervoltage levels for instrument switchesand meters mounted on the switchboardfront panel.

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System Volts C/T P/T Scale C/T C/T P/T C/T C/T C/T C/TP/T P/T P/T P/T P/T P/TP/T

1Ø3W 120/240

240

480

120/240

120/208

277/480

3Ø3W

3Ø4W

222333

——2

——3

0-3000-3000-6000-3000-3000-600

2 ——2

———

———333

—————2

————33

—————3

222333

—222

—2

222333

— 111111

— ——1

——1

—22

——2

22222

222

—2

22

———

Table 7.5—Number of CT's and or PT's required for Typical Meters Applied on Selected System Voltages

Ammeter Voltometer 2 Element 2.5 Element 3 Element Wattmeter VarmeterPower Fac-tory Meter

FrequencyMeter

Synchro-scope

Watthour Meters

4 digit 4 digit 5 digit / 8 characterindicator

Siemens 4300 and 4700 Power Meters

MeteringFeatures

Phase currentsAvg. phase currentAmpere demandPhase voltagesAvg. phase voltageLine voltagesAvg. line voltagekWkVAkVARkW demandkW hourskVAR hoursPower factorFrequency Hz

± 0.5%± 0.5%N/A± 0.5%± 0.5%± 0.5%± 0.5%± 1.0%± 1.0%± 1.0%± 1.0%± 1.0%N/A± 2.0%

0.2Hz

± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.4%± 0.4%± 0.4%± 0.4%± 0.4%± 0.4%± 1.0%

0.2Hz

Table 7.6—Power Meter Features

Power Meter Accuracy

4300 4700 4720

100:5150:5200:5300:5400:5500:5

600:5800:5

1000:51200:51500:52000:5

2500:53000:54000:55000:56000:5

Table 7.7 Available CT Ratios —Ampere Rating

± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.2%± 0.4%± 0.4%± 0.4%± 0.4%± 0.4%± 0.4%± 1.0%

0.2Hz

See Section 1

Motor Control

J Standard Control PowerTransformers: 480 / 240 / 120 Volts AC

J Pushbutton: Two-Unit Start-Stop,Open-Close, Etc.

J Selector Switch: 1-Pole, Double-Throw (ON / OFF); 2-Pole, Double-Throw (hand / off / auto)

J Pilot Lights: Red or Amber (neontype); Green (incandescent type,includes auxiliary interlock);Transformer and Push-to-Test typePilot Lights Available

J Auxiliary Interlocks: Sizes 1–4J Control Relays (may increase mount-

ing height)

J Auxiliary Switch A or B Type forMolded Case Breakers (not availableon Vacu-Break units)

Application Note: Mounting Height ofFVNR Motor Starter Increases by 2.5 in.(64 mm) when Control Transformer isFurnishedMaster Control Power Transformersrequire individual starter secondary dis-connecting means (1996 NEC 430-74).


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Static Trip® III Microprocessor-BasedTripping

The Static Trip III tripunit comes in fourmodels for maximumflexibility. Table 7.9shows the functionsof the various models.(See pages 13, 56-57).

The parameters measured by the StaticTrip IIIC / CP trip units are shown inTable 7.11. For protective relay func-tions, Table 7.10 shows how the StaticTrip IIICPX trip unit can be used. Allcommunicating Static Trip III trip unitsinclude a local communication port thatsupports the breaker mounted displayunit or BDU. The BDU features a high-

visibility alphanumeric display. Real-timemetered values, min / max values, eventlog data and setpoint data can be readon the BDU in straightforward engineer-ing units. Alarm and relay setpoint canbe configured using the BDU keypad. For complete information on Type RLbreakers, see pages 54–61.

Type RL Low Voltage Power Circuit Breakers

NEMA Size FVNR

0, 1

Table 7.8

234

50 VA100 VA150 VA250 VA

Functions

Self-Powered Overcurrent ProtectionIIICP IIICPXIIIC

Static Trip III Model

III

Table 7.9—Static Trip III Trip Unit Functions

✓RMS Sensing ✓

——

——

————————————————

Switchable Thermal Memoryopt.

opt.opt.

Ground Fault Protection✓

LCD TargetProtective Microprocessor Watchdog ✓

✓

✓

✓✓

————

opt.

opt.opt.

opt.

opt.

opt.

✓

✓✓

✓✓✓✓✓✓

✓✓✓

✓✓✓

✓

✓

✓✓

——

opt.

opt.opt.

opt.

opt.

opt.

✓

✓✓

✓✓✓✓✓✓

✓✓✓

✓✓✓

✓✓✓

✓

✓✓

opt.

opt.opt.

opt.

opt.

opt.

✓

✓✓

✓✓✓✓✓✓

✓✓✓

✓✓✓

✓✓✓✓✓

✓

Pickup LEDsZone Interlocking a

Retrofit Universal Mounting PackageRS-485 Communications PortBreaker Display Unit Port b

Communications Microprocessor WatchdogComm Watch LEDBackup Shadow ProtectionTrip LogAlarm Relay Output a

Trip Unit Status IndicationBreaker Position IndicationBreaker Operation CounterCommunication Open/Close/Trip a e

Event LogPhase Current MeteringGround Current Metering c

Neutral Current Metering d

Min/Max Current LogPower Metering FunctionsMin/Max Power LogExtended Protective RelayingExtended Trip Log

Protective Function Setting Range

Current UnbalanceMainsGenerators

Typical Applications

Motors

Table 7.10—Static Trip IIICPX Protective Relay Functions

✓Voltage Unbalance ✓Overvoltage

✓Undervoltage—

Reverse PowerOverfrequency —

—

—

✓

✓

—✓

✓✓

✓

✓

—

——

—

—

✓

Underfrequency

5–50%5–50%60–660V60–660V10–2000kW50.0–70.0Hz45.0–60.0Hz

a Requires additional wiring to meet specific application.b Supports optional Breaker Display Unit Accessory.c Included when ground fault protection specified.

d Requires “N” option and neutral current sensor.e Open command uses alarm relay output and restricts

use for other alarm functions. Close command requireselectrically operated breaker.

Pickup(X Sensor Rating)

Delay(Seconds)

2, 4, 6, 8,12, 15

No IntentionalDelay

G: Ground Fault

Pickup(% Ground Sensor)

Delay(Seconds)

20, 30, 40, 50, 60, .10, .25, .40

Pickup(X LT Setting)

Delay(Seconds)

2, 3, 4, 5,6, 7, 8, 12

.08, .15, .22

.30, 40I: Instantaneous

MeasuredParameters IIIC IIICP

Model

Phase Current

Table 7.12—Static Trip III Metering Functions

Avg. Phase CurrentsGround Current a

Neutral Current b

✓✓✓opt.——

✓✓✓

✓✓

— ✓

opt.Phase Voltages c

Avg. Phase Voltage c

Line Voltages— ✓Avg. Line Voltage— ✓kW— ✓kW Demand— ✓kW Hours— ✓kW Hours Reverse— ✓kVA— ✓kVAR— ✓kVAR Hours— ✓Power Factor— ✓Frequency

a Included when ground fault protection specified.b Requires “N” option and neutral current sensor.c Only displayed for four wire systems.

Setting a

(X Sensor Rating)Delay(Seconds @ 6X Setting)

T: Long Time

.5, .55, .6, .65, .7, .75,

.8, .85, .9, .95, 1.03.5, 6, 1017, 30

Table 7.11—Static Trip III Trip UnitSettings

S: Short Time

a Pickup is fixed at 1.1 times long time setting.

J Shunt TripJ Auxiliary Switches, up to 6 N.O. / N.C.J Undervoltage ReleaseJ Electronic “Bell Alarm” ModuleJ Electric Charging Motor Operator with

Electronic ControllerJ Integral Local Electric Close OptionJ Integral Kirk-Key Interlock on SBJ Close Blocking DeviceJ Trip Padlock Device J Position Padlock Device (Drawout)

J Cell Switches, 4 N.O. / N.C. (Mountedon Drawout Stationary Element)

J Automatic Safety ShuttersJ Kirk-Key Provision (Mounted on

Drawout Stationary Element)J Mechanical InterlockJ Capacitor Trip DeviceJ Remote Indication / Relay PanelJ Auxiliary Power Module (for bench-

testing trip unit)J TS 31 Universal Test Set For additional SB breaker information,

see Section 16.



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General

Frame AmpereRating (In)

200, 225, 250, 300, 350, 400400800 400, 450, 500, 600, 700, 800

600, 700, 800, 1000, 1200800, 1000, 1200, 16001000, 1200, 1600, 20001600, 2000, 25001600, 2000, 2500, 3000, 32002000, 2500, 3000, 3200, 40002500, 3000, 3200, 4000, 5000

1200160020002500320040005000

Table 7.13—Available Rating Plugs

Rating Plug Amperes (Ir)

Table 7.14—SB Breaker Trip Unit Ratings (Ir = Rating Plug Value; In = Frame Ampere Rating)

Long Time(T)

Pickup

Delay a (Sec.)

Pick up (xIr)

Delay (I2t) out b

Delay (I2t) in b

Pick up (xIr)

Fixed

400, 800, 1200

1600

2000

2500

3200

4000

5000

Delay (Fixed)

Delay (I2t)

Short Time(S)

Adjustable InstantaneousPick-up (I)

InstantaneousOverride c

GroundFault d

(G)

.5, .6, .65, .7, .75, .8, .85, .9, .95, 1.0

800–2000A

800–2000A

800–1200A

Available Setting (In)

2.5, 5.5, 8, 10, 14, 17, 21, 25, 30

1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 9

2500–5000A

2500–5000A

1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10

4000–5000A

65kA

1.5, 2, 2.5, 3, 4, 5, 6, 7, 8

3200A

50kA

2000A

35kA

.07, .1, .15, .2, .3 seconds

.07, .1, .15, .2, .3 seconds

25kA

25kA

20, 25, 30, 40, 50, 60, 70, 80, 90, 100

20, 26, 32, 38, 44, 50, 56, 62, 68, 75

20, 23, 27, 30, 35, 40, 45, 50, 55, 60

20, 23, 26, 29, 32, 35, 38, 41, 44, 48

20, 21, 23, 25, 27, 29, 31, 33, 35, 37

20, 21, 22, 23, 24, 25, 26, 27, 28, 30

Setting fixed at 1200A

.1, .2, .3, .4, .5 seconds @ .5 = In

.1, .2, .3, .4, .5 seconds @ .5 = Ina Current equal to 6 times Ir b Current equal to 8 times Ir c .500 seconds maximum d No trip point setting exceeds 1200 amperes

Current Setting (x Current Rating P/US)

Frame Amp Rating In

Frame Amp Rating

Frame Amp Rating

Frame Amp Rating

SB Trip Unit Static Trip III Trip Unit

a Replaceable Rating Plugs AdjustableFrom 50–100% of Frame Rating.

b Continuous Self-Diagnostic “Watchdog”c Integral Test Functions for Phase and

Ground Fault (Trip and No-Trip Tests)d External Power Source Allows Bench

Testing of Stand-Alone Trip Unite Plug-in Display Modules for Current and

Energy Display Capabilitiesf Long Time Continuous Current Settingg Long Time Delay Band Setting

h Short TIme Pickup Settingi Short Time Delay Band Settingj Instantaneous Pickup Settingk Integral LED Trip Indicatorsl Full Communications Capability Via

Siemens ACCESS Networkm LCD Targetn Thermal Memory Switcho Short Time I2t Ramp Switchp Zone Interlock Switch

q Zone Interlocking Input / Output and Future Options

r LCD Displays Key Padt Test Connector

Serial PortSystem Check LedsSystem Status Leds

SB Encased Systems Breakers

SB-EC Trip Unit

1

23

21

22

18

19

20

21

22

23

Molded Case Circuit BreakersJ Alarm Switch for remote indication

and / or pilot device operation whenbreaker is tripped automatically.

J Shunt Trip (electric open-manualclose) for remote tripping of breaker.Includes cut-off switch. Specify con-trol voltage.

J Undervoltage Trip automatically tripsbreaker when voltage is reduced35%–70% of coil rating. SpecifyControl Voltage.

J Auxiliary Switch 1A and 1B, 2A and2B, etc.

J Telemand Motor Operator (electricopen and close). Operating Voltage48V DC; 120, 240V AC.

J Ground Fault Relay (requires shunttrip).

Vacu-Break® FusibleSwitchesAll Vacu-Break fusible switches include:J Voidable Cover InterlockJ Quick-Make, Quick-Break OperationJ Positive ON / OFF ActionJ Padlockable Handle Design (at ON or

OFF)J Vacu-Break Arc Control (i.e., enclosed

arc chamber, double-break magneticarc blowout)

J Clampmatic Pressure Spring ForceOn Closed Contacts

J Spring-Reinforced Fuse Holders For 250V switches (30 to 600A):J Class R Rejection Type Fuse Holders

for all units except the 2.5 in. (64mm) high unit, which is suitable onlyfor NEC Class H, K1 and K5 fuses.

For 600V switches (30 to 600A):J Class R Rejection Type Fuse Holders

or Class J Fuse Holders.

Bolted Pressure SwitchesThese switches are suitable for use onsystems capable of delivering fault cur-rent up to 200,000 amperes symmetri-cal RMS when equipped with Class Lfuses. All bolted pressure switchesinclude:J Fuse Door InterlockJ Quick-Make, Quick-Break OperationJ Bolted Pressure Force on OperationJ Bolted Pressure Force on Closed

ContactJ Padlockable Handle (in the “open”

position only)

Accessories and modifications:J Shunt Trip (electrical open-manual

close)J 120V AC Standard Control VoltageJ Electrical Operator (electrical open

specify system voltage)J Ground Fault Relay (requires shunt

trip)J Blown Fuse Trip (switch opens when

any one fuse blows — requires shunttrip)

J Blown Fuse Indicating LightsJ Phase Failure Relay with Capacitor

Trip (detects failure of any one phaseand opens switch — requires shunttrip, specify system voltage)

J Auxiliary Contacts

HCP Fusible SwitchesRated 200,000 amperes RMS symmetri-cal when equipped with Class L fuses.Standard features include:J High Contact Silver Alloy ContactsJ Heavy Duty Quick-Make, Quick-BreakAccessories include:J Undervoltage Release —

InstantaneousJ Remote Spring Release ClosingJ Remote Trip SignalingJ Bell Alarm with LockoutJ Shunt Trip with Standard Control

Voltages of 120, 240, 480V AC;12, 24, 48 and 125V DC.


General


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MaximumAmpereRating

Available AmperageRange

Percentageof Max.Cont. Amps

MoreDetails onPage

BreakerFrame

Percentage of Max.

MaximumRange

Time inSeconds

60012001600

SJD, SLDSMD, SNDSPD

200-600600-1200

1200-1600

20-100%20-100%20-100%

40-600120-1200240-1600

20-70%20-70%20-70%

0.10-0.400.10-0.400.10-0.40

329-330

Table 7.15 Sensitrip® Breaker Adjustment Range Overview

Maximum ContinuousCurrent Range Ground Fault Range

Function

Continuous Ampere (Ir)

Long-Time Delay

Short-TimePickup

Short-TimeDelay

InstantaneousPickup

Ground FaultPickup

Ground Fault Delay

Performance

Table 7.16 Breaker Functions (In = Nominal Rating of Circuit Breaker)

Varies the level of current the circuit breaker will carry without tripping.Completely adjustable from 20 to 100% of breaker's continuous ampererating. (Ir = % of In) Referred to as the “overload” position, this function controls the breaker's“pause-in-tripping” time to allow low level, temporary inrush currents suchas those encountered when starting a motor to pass without tripping.Adjustable settings from 3 or 25 seconds at 6 x Ir are possible.Controls the amount of high current the breaker will remain closed againstfor short periods of time, allowing better coordination. Adjustable between1.5 to 10 times the continuous ampere setting of the circuit breaker (i.e.,adjustable from 1.5 to 10 times Ir).Controls the amount of time (from .05 to .2 seconds in fixed time, or .2 seconds at 6 x lr in the l2t ramp mode) a breaker will remain closed againsthigh fault current. This function is used in concert with the Short-Time Pickup function to achieve selectivity and coordination. (A pre-determinedoverride automatically preempts the setting at 10.5 times the maximumcontinuous ampere setting In.)Determines the level at which the circuit breaker trips without anintentional time delay. The instantaneous pickup function is adjustablefrom 2 to 40 times the continuous ampere setting (lr) of the breaker.(Anytime an overlap exists between the instantaneous and short-timepickup settings the instantaneous automatically takes precedence.)Controls level of ground fault current which will cause circuit interruptionto ocurr. Complies with National Electric Code, Article 230, Section 95(a)for maximum trip point settings. Adjustable from 20 to 70 percent of thebreaker's maximum continuous ampere setting (In).Adds a predetermined time delay to the trip point once ground fault pickuplevel is reached. Inverse l2t ramp is standard which provides better trippingselectivity between the main and feeder or other downstream breakers.

Molded Case CircuitBreakersNormal and Heavy Duty

Normal duty breakers are designed forcommercial, industrial, institutional andother heavy duty applications and ratedto 600 volts AC; 250 volts DC. HeavyDuty breakers have higher interruptingratings than normal duty.

Extra Heavy Duty

These are designed for heavy duty appli-cations where the interrupting require-ments exceed the ratings of heavy dutybreakers. They are rated up to 600 voltsAC and 250 volts DC.

Solid State Trip

Equipped with solid state tripping, andavailable in heavy duty and extra heavyduty interrupting ratings at 600V AC.

Current-Limiting

These breakers incorporate the exclusiveSiemens blow-apart interruption principleand meet the NEC requirements for cur-rent-limiting breakers. Current-limitingcircuit breakers can limit the let-throughl2t to a value less than the l2t of one-half cycle wave of the symmetricalprospective current without any fusibleelements when operating within theircurrent-limiting range.

Sentron™ SwitchboardsInterrupting Ratings of Disconnect Devices


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Technical

240V 480V 600V 250V a 500V a

100

125

225

400

100

125

225

250

400

600

800

1200

1600

2000

400

600

800

1200

1600

100

125

250

400

600

800

1200

400

600

800

1200

1600

125

250

400

600

800

1200

1600

400

600

800

1200

15-100

15-12560-225

200-400

15-100

15-125

60-22570-250

200-400250-600

500-800

800-12001200-16001600-2000

200-400200-400200-400

200-400

15-10015-12515-12560-22570-25070-250

200-400200-400200-600400-600500-800500-800

800-1200

— — — —

14,000 — — —

— — — —

—

—18,00025,000

—

35,000

50,000

35,000

—42,00065,000

— 65,000 100,000 65,000100,000

100,00065,000

65,000

65,000

65,000100,000

50,000

65,000

—

——

18,000—

22,000

25,000

25,000

50,000

—

30,000

5,000

30,000

—

30,000

—

—

—

——

18,000—

18,000

25,000

—

—— 30,000 —

25,000 — —— — —

25,000 30,000 25,000— —25,000

25,000

35,00050,000

50,000

— —

— —

30,000 25,000

50,000

35,000

50,000

30,000 35,000

30,000

—

50,000

—

BQHBLHBQDBLQJ2JXD2

ED2ED4ED6QJH2FXD6/FD6JXD6/JD6LXD6/LD6LMXD6/LMD6/MXD6/MD6NXD6/ND6PXD6/PD6RXD6/RD6

SJD6SLD6SMD6SND6SPD6

3200 2000-3200 STD6

HBLHED4HHED6QJ2-HHFD6HHFD6HJD6/HJXD6HHJD6/HHJXD6HLD6/HLXD6HHLD6/HHLXD6HLMD6/HLMXD6HMD6/HMXD6HND6/HNXD6

40-400 SHJD660-600 SHLD6

120-800 SHMD6160-1200 SHND6240-1600 SHPD6

3200 2000-3200 SHTD6SHHTD6

15-125 CED670-250 CFD6

200-400 CJD6400-600 CLD6500-800 CMD6

800-1200 CND61200-1600 CPD6

1600

800-1200

1200-1600 HPD6/HPXD62000 1600-2000 HRD6/HRXD6

40-400 SCJD660-600 SCLD6

120-800 SCMD6160-1200 SCND6

22,000

—

10,000

65,000

10,000

65,000

22,000

65,000

65,000

85,000

65,000

100,000

42,000100,000200,000100,000200,000100,000200,000

100,000

100,000

100,000200,000

100,000150,000

200,000

150,000

100,000

100,000

65,000

30,000 50,000

150,000 100,000

100,000 65,000— —

200,000

150,000

100,000

200,000

Table 7.17 Interrupting Ratings of Molded Case Circuit Breakers

MaximumAmpereRating

Available AmperageRange

BreakerType

Maximum Interrupting Capacity

Symmetrical RMS Amperes VAC In DC Amperes (VDC)

Normal Duty — Thermal-Magnetic

Heavy Duty — Thermal-Magnetic

Heavy Duty — Solid-State Trip

Extra Heavy Duty — Thermal-Magnetic b

Extra Heavy Duty — Solid-State Trip

Current-Limiting — Thermal-Magnetic

Current-Limiting — Solid-State Trip

35,000

Type JD / LD Extra Heavy DutySolid-State Trip

Type FD6, FXD6 Heavy DutyThermal-Magnetic Breaker

a All breakers are 2-pole for DC rating.b Extra heavy duty breakers are inherently fungus-proof

an do not require special fungus treatment.


Technical


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601, 700, 8001000, 12001500, 16001800, 2000 200,000250030003500, 40005000

800

1600

1200

2000

3000

2500

5000e

4000

1000, 1200

601,800

400

800

600

1200

AmpereRating

Fuse Class (Amperes)

Fuse InterruptingRating(Sym. RMS Amps)

1000, 1200

600,800—

—

400600

——

——

200,000

J Tf L

Table 7.22 HCP Fusible Switches

RL-800 30,000 30,000 30,000 75-800

NECStandardH, K1, K5

Class RRejectionType

RLE-800 42,000 65,000 42,000 75-800RLI-800 22,000 42,000 22,000 75-800RL-1600 50,000 65,000 50,000 75-1600RL-2000 65,000 65,000 65,000 75-2000RLE-2000 85,000 85,000 85,000 75-2000RLE-3200 65,000 85,000 65,000 600-3200

800-4000a

RK1, RK5

J

L

10,000

200,000

200,000

100,000 d

RL-4000 85,000 100,000 85,000

800-4000*a

RLE-4000 100,000 100,000 100,000 800-4000a

RL-5000 85,000 100,000 85,000 2500-5000

Voltage Rating Short Circuit RatingSymmetrical Current

Table 7.18 Type RL Low Voltage Power Circuit Breakers b Table 7.20 Vacu-Break® FusibleSwitches c

FrameSizeAmperes

800

1600

2000

3200

4000

5000

RL-800 30,000 30,000 30,000 75-800RLE-800 42,000 65,000 42,000 75-800RLI-800 22,000 100,000 22,000 75-800RL-1600 50,000 65,000 50,000 75-1600RL-2000 65,000 65,000 65,000 75-2000RLE-2000 85,000 100,000 85,000 75-2000RLE-3200 65,000 85,000 65,000 600-3200RL-4000 85,000 100,000 85,000 800-4000a

RLE-4000 100,000 100,000 100,000 800-4000a

RL-5000 85,000 100,000 85,000 2500-5000

800

1600

2000

3200

4000

5000

RL-800 30,000 42,000 30,000 75-800RLE-800 42,000 65,000 42,000 75-800RLI-800 22,000 100,000 22,000 75-800RL-1600 50,000 65,000 50,000 75-1600RL-2000

600

480

240and208

635

508

254

2200

2200

2200 65,000 65,000 65,000 75-2000

RLE-2000 85,000 100,000 85,000 75-2000RLE-3200 65,000 85,000 65,000 600-3200RL-4000 85,000 130,000 85,000 800-4000a

RLE-4000

RLF-3200 &RFC-3200Fuse Carriage

208to600

600RLF-4000 &RFC-4000Fuse Carriage

100,000 130,000 100,000 800-4000a

RL-5000 85,000 130,000 85,000 2500-5000

800

1600

2000

3200

4000

RLF-800RLF-1600 2200

2200

2200

2200

200,000

200,000

200,000

200,000

RLF-2000

2000- 5000

4000- 6000

6000

250-1600800-3000

4000

600- 3200

800- 3200

2500- 5000

75- 80075-160075-2000

800

2000

3200

4000

RLF-5000 &RFC-5000Fuse Carriage

5000

1600

5000

BreakerType

RatedVoltage

RatedMax.Voltage

Short TimeRatingSymmet-ricalAmperes

With Instant-aneousTripAmperes

WithoutInstant-aneousTripAmperes

Contin-uousCurrentRatingAmperes

MaximumInterruptingCapacity InSymmetricalRMSAmperes,240 to 600VAC

Max.AmpereRating

30to600

8001200

FuseClass

FuseHolder

Insul-ationLevelDielectricWith-standVolts

Voltage Rating ShortCircuitRatingsSymmetricalAmps

Table 7.19 Type RLF Fused Low Voltage Power Circuit Breakers b

TypeRatedVolts

RatedMax.Volts

FrameSizeAmperes

RangeOf FuseRatingsAmperes

ContinuousCurrentRatingAmperes

InsulationLevelDielectricWithstandVolts

RejectionType

Table 7.21 Bolted PressureSwitches. All 600V AC Maximum2 or 3 Poles

—

AmpereRating

Class LFuse Rating(Amperes)

Fuse InterruptingRating(Sym. RMS Amps)

a With the addition of fan cooling and 5000A coppermain bus, a 4200A continuous rating is available.

b For complete details on Siemens RL Power Breakers,see pages 54 to 62.All circuit breakers (and drawout fuses and carriage,if applicable) are UL listed.

c For further information on Vacu-Breaker switches,see pages 355 to 370.

d 200,000A max. on 800A switch with “L” or “T” fusesand 1200A switch at 240V with “L” fuses.

e 5000A bolted pressure switch not UL listed.f For use at 240V maximum system.



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Technical

200–400400–800

200–400

SBA

SBH

65,000

200,000

65,000

150,000

42,000

50,000

100,000

65,000

25,000

25,000

35,000

35,000

25,000

35,000

50,000

65,000

400

400

400–800800

600–12001200

800–16001600

1000–20002000

1600–25002500

1600–32003200

2000–40004000

2500–50005000

400–800800

600–12001200

800–16001600

1000–20002000

1600–25002500

1600–32003200

2000–40004000

2500–50005000

600–1200800

800–16001200

1000–200016002000

Maximum Interrupting CapacityIn Symmetrical RMS AmperesFor Voltage AC

Table 7.23 Type SB Encased Systems Breakersa

AvailableAmperageRange

BreakerType 240V 480V 600V

MaximumAmpereRating

Short TimeRatings InSymmetricalRMS Amperes(30 Cycles)

SBS 100,000 100,00065,000

85,000

a For complete details on Siemens SB Encased Systems Breakers, see pages 313 to 325.


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Sentron™ SwitchboardsPressure Wire Connectors

Technical

Table 7.24 Pressure Wire Connectors Table 7.24 Pressure Wire Connectors (cont’d)

BreakerType

ConnectorApplied toAmperageRange

Terminals are UL listed for 60/75°C conductors; CSA listed for copper wire only.a

Optional — use only in cases allowed by local codes.b

Use on load side only.c

This connector is of aluminum construction, but rated for copper cable only.d

200A — Apply this connector when continuous current setting is adjusted for lowerampacities.

e

CablesperConnector

Connectora

Wire RangesAvailable

Normal Duty — Thermal-Magnetic

Heavy/Extra Heavy Duty, Current-Limiting — Thermal-Magnetic

BQHBLHHBLBQD

BL

QJ2QJH2QJ2-H

JXD2

ED2ED4ED6HED4HHED6CED6

FXD6/FD6HFD6, CFD6HHFD6

JXD6/JD6HJD6/HJXD6HHJD6/HHJXD6CJD6

LXD6/LD6HLD6/HLXD6HHLD6CLD6

MXD6/MD6NXD6/ND6HND6/HNXD6CMD6, CND6LMD6, LMXD6HLMXD6

PXD6/PD6HPD6/HPXD6CPD6PXD6/PD6HPD6/HPXD6RXD6/RD6HRD6/HRXD6

15–30 1

1

1

1

1

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1 pc.

1-2 pcs.

1-2 pcs.

1-2 pcs.

1-2 pcs.

1-3 pcs.

1-3 pcs.

1-4 pcs.

1-5 pcs.

1-4 pcs.

1-6 pcs.

35–50

55–70

80–100

110–125

60–225

15–20

25

30–60c

1 Pole, CED6

30–60 c1 Pole, CED6

30–1252–3 Pole

30–100

70–250

110–125

200–400

200–400

250–600

500–600

700–800

800–1200

1200–1600

1600–2000

#14 - #6 AWG Cu#12 - #8 AWG Al#8 - #6 AWG Cu#8 - #4 AWG Al#8 - #4 AWG Cu#8 - #2 AWG Al#4 - #1/0 AWG Cu#2 - #1/0 AWG Al#2 - #1/0 AWG Cu#1/0 - #2/0 AWG Al#6 AWG - 250 kcmil Cub

3/0 - 500 kcmil Cu

4/0 - 500 kcmil Al

3/0 – 600 kcmil Cub

500 – 600 kcmil Cub


600 – 750 kcmil Alb

#1 AWG- 350 kcmilb

#1/0 AWG-500 kcmilCu or Al





300 – 600 kcmil Cu or Al b

300 – 600 kcmil Cu or Al

750 kcmil Alb d




3/0 - 500 kcmil Cub

4/0 - 500 kcmil Al

#6 AWG - 250 kcmil Cu#6 AWG - 350 kcmil Cu b

#4 AWG - 350 kcmil Al

#1 AWG - 500 kcmil Cu or Al

#6 AWG - 300 kcmil Cu#4 AWG - 300 kcmil Al#6 AWG - 300 kcmil Cu#4 AWG - 300 kcmil Al

#14 - #10 AWG Cu#12 - #10 AWG Al#10 AWG Cu. or Al

#10 - #4 Cu. or Al

#10- #1/0 AWG Cu. or Al

#4- #1/0 Cu. or Al

#3/0 - 3 Cu#2/0- 1 Al

#10 - #3/0 Cu. Only

BreakerType

ConnectorApplied toAmperageRange

CablesperConnector

Connectora

Wire RangesAvailable

Heavy / Extra Heavy Duty, Current-Limiting — Solid-State Trip

SJD6, SHJD6SCJD6

SLD6, SHLD6SCLD6

SMD6, SHMD6SCMD6SND6, SHND6SCND6

SPD6 / SHPD6

STD6 / SHTD6 /SHHTD6

200–400e 1-2 pcs.

1-2 pcs.

1-2 pcs.

1-3 pcs.

1-4 pcs.

1-4 pcs.

1-5 pcs.1-4 pcs.d

250–600e

500–600

700–800

800–1200

1200–1600

2000

3/0 - 500 kcmil Cu4/0 - 500 kcmil Al3/0 - 500 kcmil Cu

250 – 500 kcmil Cu or Al300 – 600 kcmil Cu or Al750 kcmil Cu or Al b

1-6 pcs. 250 – 600 kcmil Cu or Al

4/0 - 500 kcmil Al

4/0 - 750 kcmil Al or Cu f

#1 AWG - 500 kcmil Cu or Al

#1/0 AWG - 500 kcmil Cu or Al

30 60

100 200 400 600 800

1200

#14 - #4 AWG#14 - #4 AWG#1/0 AWG#6 AWG - 350 kcmil#4/0 AWG - 500 kcmil#4/0 AWG - 500 kcmil#4/0 AWG - 500 kcmil#4/0 AWG - 500 kcmil

Cu or AlCu or AlCu or AlCu or AlCu or AlCu or AlCu or AlCu or Al

Table 7.25 Vacu-Break Fusible Switches

AmpereRating

Cables per Connector


WireRange Type

30 (2.5 in.)(64 mm)

(Branch Connectors)

#14 - #8 AWG Cu1

11112234

400 – 600 2 #1 AWG-500 kcmil Cu or Al400 – 600 2 #1 AWG-500 kcmil Cu only400 – 800 3 #1 AWG-500 kcmil Cu or Al400 – 800 3 #1 AWG-350 kcmil Cu only800 – 1200 4 #1 AWG-500 kcmil Cu or Al800 – 1200 3 #250-500 kcmil Cu only

Table 7.26 HCP Fusible Switches

AmpereRating


WireRange Type

(Branch Connectors)

Table 7.27 Fusible Bolted Pressure Switchesf

AmpereRating

WireRange Type

(Branch Connectors)

#4/0 AWG - 750 kcmil#4/0 AWG - 750 kcmil#4/0 AWG - 750 kcmil#4/0 AWG - 750 kcmil

800120016002000

Cu or AlCu or AlCu or AlCu or Al

2466

Table 7.28 Starters and Contactors (Lug Data)

NEMA Size Lugs per Pole Wire Range Type

#14 - #8 AWG#14 - #4 AWG#14 - #1/0 AWG

00-123

Cu OnlyCu OnlyCu/Al

111

3200

Not available with breaker or switch. Requires bussing to install.f

Service entrance switchboards oftenrequire that a utility current transformercompartment be included. The NationalElectrical Manufacturer’s Association(NEMA) has created a section coveringutility C.T. compartments for inclusion inPB-2, the existing standard for switch-boards. Siemens C.T. compartments have beendesigned to conform to this standard.All specific utility requirements takeprecedence but in the absence of anyspecial requirements, the standard willbe used.

PB-2 5.06 Utility TransformerCompartment

Switchboard assemblies containing cur-rent transformer compartments for utili-ty metering shall be arranged as shownin Figures 1 through 4. All indicateddimensions are minimum except themounting for the current transformer.Mounting shall be for either bar or win-dow type transformers. The front of the compartment shall beaccessible through a sealable hinged,single or double door or removablecover.Barriers shall be installed as required toprevent access through other than seal-able doors or covers.

EUSERC Member Utilities

For all cases where incoming service isfrom below, underground pull sectionsare required. For EUSERC member utilities, under-ground pull sections require nonbussedsections for 400 ampere, lug landingsfor 600 and 800 ampere and bussedpull sections above 800 ampere.

Other Utilities

For all other utilities, non-bussed orbussed pull sections are required perlocal utility and code requirements.

Notes:

The utility C.T. compartments may be in theupper or lower portion of the Service Section.

Neutral may be located to the rear alongside ØAor ØC; — alternate rear location between ØAand ØB, or ØB and ØC.

All dimensions are shown in inches and mm.

The neutral need not be located in the C.T. com-partment, provided its location complies with1993 NEC. article 300-20, and with UL as theyrelate to induced currents.

Quantity and size of aluminum and copper busper UL 891, or manufacturers’ UL Listed sizes,based on temperature rise.

Barrier material and thickness per UL 891.

This standard is intended for C.T.’s built to ANSIC12.11-1978.

Sentron™ SwitchboardsStandard C.T. Compartments


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Dimensions

AmpereRating

400–800

400–800

1

2

2

3 10.00(254)

30(762)

30(762)

30(762)

38(965)

38(965)

38(965)

20(508)

28(711)

28(711)

A

9.00(229)

B

6.44(164)

7.50(191)

10.50(267)

C F G

10.00(254)

9.00(229)

10.88(276)

7.50(191)

17.50(445)

7.50(191)4 11.50

(292)6.02(153)

9.00(229)

17.50(445)

3

1200–2000

2 30(762)

38(965)

38(965)

7.50(191)4 11.50

(292)6.82(173)

9.00(229)

19.00(483)1200–2000

2 30(762)

38(965)

38(965)

7.50(191)4 11.50

(292)7.07(180)

9.00(229)

19.00(483)2500

2 30(762)

38(965)

38(965)

7.50(191)4 11.50

(292)7.07(180)

9.00(229)

19.00(483)3000–4000

H W D

Dimensions In Inches (mm)CompartmentDimensions In Inches (mm)

Table 7.29 NEMA Standard Only

BusDrillingFigureFig.

Figure 2

Figure 1

Figure 3 Figure 4

Sentron™ SwitchboardsUtility Metering — Types SB1, SB2, and SB3

General


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480V 240V Utility

Electric Utility Company Code Hot Cold Hot Cold SB1 SB2 SB3

Alameda City of Bureau of Electricity EUSERC X X X X X

Anaheim City of Public Utilities Department EUSERC X X X X X

Anderson Municipal, IN AM X X X

Anoka Electric Co., MN AN X X X

Appalachian Power Co., VA (NEMA) AP X X X X X

Arizona Public Service Company EUSERC X X X X X

Atlantic Electric, NJ AE X X X X X

Austin Electric Dept., TX AU X X X

Azusa City of Light and Water Department EUSERC X X X X X

Baltimore Gas & Electric, MD BG X X X X X

Bangor Hydro-Electric Co., ME BH X X X

Banning City of Electric Department EUSERC X X X X X

Belmont Municipal, MA BM X X X

Benton County Public Utility District No. 1 EUSERC X X X X X

Benton Rural Electric Association EUSERC X X X X X

Blackstone Valley Elect. Co., RI BV X X X

Boston Edison Co., MA BE X X X

Braintree Elect., Light Co., MA BL X X X

Burbank City of Public Service Department EUSERC X X X

Burlington Elect., Lighting Dept., VT BD X X X

Callum County Public Utility District CP X X X X X

Cambridge Electric Co., MA CA X X X

Central Colorado Pwr./Centel Corp., CO CX X X X

Central Hudson Gas & Electric, NY CH X X X X X

Central Illinois Light Co., IL CT X X X

Central Illinois Public Service, IL CV X X X

Central Maine Power Co., ME CM X X X X X

Central Vermont Public Service Corp., VT CR X X X

Chelan County Public Utility District EUSERC X X X X X

Chicopee Light & Power, MA CL X X X

Cincinnati Gas & Electric, OH CG X X X X X

Citizens Utility Company Kauat Electric Division EUSERC X X X X X

City of Colorado Springs X X X X X

City of Dover, DE CD X X X

City of Vineland, NJ CI X X X

Clark County Public Utility District EUSERC X X X X X

Cleveland Electric Illuminating Co., OH CC X X X

Colorado Springs Dept. of Utilities, CO EUSERC X X X X X

Columbus Div. of Electric, OH CY X X X

Columbus Southern Power, OH CU X X X

Commonwealth Edison Co., IL CE X X X X X

Commonwealth Electric, MA CW X X X

Concord Electric Co., NH CO X X X

Connecticut Light & Power Co., CT CN X X X X X

Consolidated Edison Co., NY (298-377) CS X X X

Consumers Power of Michigan, MI CF X X X

Coos-Curry Electric Cooperative EUSERC X X X X X

CP National Corporation EUSERC X X X X X

Cornbelt Electric Co-Op., IL CB X X X

Danvers Elect., Div., MA DC X X X

Dayton Power & Light Co., OH DP X X X

Delaware Power & Light Co., DE DL X X X

Delmarva Power & Light, DE DM X X X

Des Moines District X X X

Detroit Edison Co., MI DE X X X X X

Table 7.30 Utility Reference



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GeneralTable 7.30 Utility Reference (cont’d)

480V 240V Utility


Duquesne Light Co., PA DU X X X

East Central Electric, MN EC X X X

Eastern Edison Co., MA EE X X X

Eugene Water and Electric Board X X X X X

Exeter & Hampton Electric Co., NH EH X X X

Florida Power and Light (NEMA) X X X

Franklin County Public Utility District EUSERC X X X X X

Freeport Electric Dept., NY FE X X X

Georgia Power Co., GA (NEMA) GP X X X X X

Glendale City of Public Service Department EUSERC X X X X X

Granite State, NH (NEMA) GS X X X X X

Grant County Public Utilities District EUSERC X X X X X

Gray’s Harbor County District No. 1 EUSERC X X X X X

Green Mountain Power Co., VT (NEMA) GM X X X X X

Greenport Electric Dept., NY GL X X X

Gulf State Utilities Co., TX GE X X X X X

Hampton Power and Light (NEMA) X X X X X

Hancock Co., Rural Electric Corp., IA HC X X X

Hawaii Electric Company EUSERC X X X X X

Hawaii Electric Light Company EUSERC X X X X X

Heraldsburg EUSERC X X X X X

Idaho Power EUSERC X X X X X

Idaho Power Company EUSERC X X X X X

Illinois Power Co., IL IC X X X X X

Imperial Irrigation District EUSERC X X X X X

Indiana & Michigan Electric Co., IN IM X X X

Indianapolis Power & Light, IN IP X X X X X

Interstate Power Co., IA IN X X X

Iowa Illinois Gas & Electric, IA IL X X X

Iowa Public Service, IA IS X X X X X

Iowa Southern Utilities Co., IA IU X X X

Jacksonville Electric Authority, FL (NEMA) JE X X X X X

Jersey Central Power & Light, NJ JC X X X

Kansas City Power & Light Co., MO KC X X X X X

Kansas Gas & Electric Co., KS KG X X X

Kansas Power & Light, KS KL X X X

Kentucky Power, KY (NEMA) KP X X X

Kentucky Utilities, KY (NEMA) KU X X X

Klickitat Company Public Utility District EUSERC X X X X X

Lake Superior District Power Co., MN LS X X X

Lassen Municipal Utility District EUSERC X X X X X

Laverne Municipal Electric Plant, OK LM X X X

Lincoln Electric System, NE LC X X X

Lodi EUSERC X X X X X

Lompoc EUSERC X X X X X

Long Island Lighting Co., NY LI X X X

Los Angeles Department of Water and Power EUSERC X X X X X

Louisville Gas & Electric Co., KY LG X X X X X

Lubec Water & Electric District, ME LL X X X

Madison Gas & Electric Co., WI MG X X X

Maine Public Service Co., ME MP X X X

Mason County Public Utility District EUSERC X X X X X

Massachusetts Electric Co., MA (NEMA) MC X X X X X

Maui Electric Company EUSERC X X X X X

McMinnvile Water and Light EUSERC X X X X X


General


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480V 240V Utility


Messa EUSERC X X X X X

Metropolitan Edison Co., PA ME X X X X X

MidAmerica Energy X X X X X

Midwest Power Co., IA MI X X X

Minnesota Power & Light Co., MN ML X X X

Mississippi Power & Light, MS MS X X X

Modesto Irrigation Distict EUSERC X X X X X

Monongahela Power Co., WV MO X X X

Montana Dakota Utilities, MT/ND/SD MD X X X

Montana Power and Light EUSERC X X X X X

Montana Power Company EUSERC X X X X X

Muscatine Power & Water, IA MW X X X

Narragansett Electrical Co., RI NE X X X X X

Navopacheelectriec Cooperative Incorporated EUSERC X X X X X

Nema X X X X X

Nevada Electric X X X X X

Nevada Power Company Incorporated X X X X X

New England Power X X X

New Orleans Public Service, LA NO X X X X X

Newport Electric Corp., RI NC X X X

New York State Electric & Gas Corp., NY NY X X X X X

Niagara Mohawk Corp., NY NM X X X

Northern Indiana Public Service, IN NI X X X

Northern States Power Co., MN/WI/ND/SD NS X X X X X

NorthEast Utility X X X

Northwestern Public Service, SD NP X X X

Norwich Dept. of Public Utilities, CT ND X X X

Norwood Municipal Light Co., MA NL X X X

Ohio Edison Co., OH OE X X X

Ohio Power Co., OH OP X X X

Omaha Public Power District, NE OM X X X X X

Orange & Rockland Utilities, NY OR X X X X X

Otter Tail Power Co., MN OT X X X

Pacific Gas and Electric EUSERC X X X X X

Pacific Power and Light Company EUSERC X X X X X

Palo Alto City of Water and Power Department EUSERC X X X X X

Parker Municipal Light Dept., SD PM X X X

Pasadena City of Water and Power Department EUSERC X X X X X

Penn Electric X X X X X

Peninsular Light Company EUSERC X X X X X

Pennsylvania Electric Co., PA PE X X X

Pennsylvania Power Co., PA PY X X X

Pennsylvania Power & Light Co., PA PL X X X

Philadelphia Electric Co., PA PH X X X X X

Plumas-Sierra Rural Electric Company EUSERC X X X X X

Port Angles City Light EUSERC X X X X X

Portland General Electric EUSERC X X X X X

Potomac Edison Co., MD PT X X X X X

Potomac Electric Power Co., DC PP X X X

Public Service Electric & Gas Co., NJ PS X X X X X

Public Service of Colorado, CO PC X X X X X

Public Service of Indiana, IN PI X X X

Public Service of New Hempshire, NH PU X X X

Puget Sound Power and Light EUSERC X X X X X

Redding City of Electric Utility EUSERC X X X X X

Table 7.30 Utility Reference (cont’d)



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General

480V 240V Utility Electric Utility Company Code Hot Cold Hot Cold SB1 SB2 SB3

Richland EUSERC X X X X XRiverside City of Riverside Public Utility EUSERC X X X X XRochester Gas & Electric Co., NY RG X X XRockland Electric X X XRockville Centre Electric Dept., NY RE X X XRoseville City of Electric Department EUSERC X X X X XSacramento Municipal Utility District EUSERC X X X X XSalem Electric EUSERC X X X X XSalt River Project EUSERC X X X X XSan Diego Gas and Electric EUSERC X X X X XSanta Clara City of Electric Department EUSERC X X X X XSeatle City of Washington EUSERC X X X X XSierra Pacific Power Company EUSERC X X X X XSnohomish County Public Utility District No. 1 EUSERC X X X X XSouthern California Edison Company EUSERC X X X X X Southern California Water Company EUSERC X X X X X South Central Elec. Association, MN SC X X X South Hadley Electric Light Dept., MA SH X X XSouth Norwalk Electric, CT SN X X XSouthern Indiana Gas & Electric, IN SI X X XSouthern Maryland Co-Op, MD SM X X XSpringField Utility Board EUSERC X X X X X St. Louis Municipal Electric, MI SL X X XSulpher Springs Valley Electric Corporation EUSERC X X X X XSuperior Water Light & Power, MN SW X X X Tacoma EUSERC X X X X XTallahassee Electric (NEMA) X X X X XTrico Electric Cooperative EUSERC X X X X XTruckee Donner Public Utility District EUSERC X X X X XTucson Electric Power Company EUSERC X X X X XTurlock Irrigation District EUSERC X X X X XToledo Edison, OH TE X X X Ukia EUSERC X X X X XUnion Electric of St. Louis, MO UE X X X X XUnion Light Heat & Power Co., KY UL X X XUnited Illuminating Co., CT UI X X X X XUtah Power and Light X X X X XVermont Public Service, VT VP X X XVernon EUSERC X X X X XVillage of Hamilton, NY VH X X XVirginia Electric Power Co., VA VE X X XWakefield Municipal, MA WM X X XWashing Water and Power EUSERC X X X X XWatertown Municipal, NY WA X X XWatertown Municipal Utilities, SD WU X X XWellesley Dept. of Public Works, MA WY X X XWestField Gas and Electric X X XWest Penn Power Co., PA WP X X XWestern Area Power Administration EUSERC X X X X XWestern Gas and Electric X X XWestern Massachusetts Electric Co., MA WT X X XWesterville Electric Co., OH WR X X XWheatland Electric Co-Op., KS WC X X XWisconsin Electric Power Co., WI WE X X XWisconsin Power & Light Co., WI WL X X XWisconsin Public Service, WI WS X X X

Table 7.30 Utility Reference (cont’d)

Dimensions


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AmpereRating(MLO)

400

600

800

1000

1200

1600

2000

AllTypesH1

PullBoxH2

MinimumAll TypesW1

AllTypesW2

D1 Bussed Pull Section

D2

SB1 SB2 SB3SB1 SB2 SB3

Distribution Section

SB1 SB2 SB3H3c H4c

Unit Space

E

E

E

E

E

E

E

C

C

C

C

C

C

C

A

A

A

A

A

A

A

E

E

E

F

F

F

F

C

C

C

D

D

D

D

A

A

A

B

B

B

B

E

E

E

F

F

F

F

C

C

C

D

D

D

D

A

A

A

B

B

B

B

32 or 38(813 or965)

90(2286)

15(381)

30(762)

65(1651)

38(965)

Standard Utility Metering

Table 7.31 Standard Utility Dimensions

Dimensions in Inches (mm)

Height Width Depth - Minimum — Letters Reference Chart Below

AmpereRating(MLO)

400

600

800

1000

1200

1600

2000

AllTypesH1

PullBoxH2

MinimumAll TypesW1

AllTypesW2

D1 Bussed Pull Section

D2

SB1 SB2 SB3SB1

A

B

C

D

E

F

SB2 SB3

Distribution Section

SB1 SB2 SB3H3c H4c

Unit Space

30 (762)c

30 (762)c

30 (762)c

30 (762)c

—

—

—

—

—

—

h

h

h

h

—

—

—

65 (1651)c

65 (1651)c

65 (1651)c

65 (1651)c

65 (1651)c

65 (1651)c

65 (1651)c

E

E

E

E

E

E

E

C

C

C

C

C

C

C

A

A

A

A

A

A

A

E

E

E

E

F

F

F

C

C

C

C

D

D

D

A

A

A

A

B

B

B

E

E

E

E

—

—

—

C

C

C

C

—

—

—

A

20 in.(508 mm)

28, 38 in.(711, 965 mm)

28 in.(711 mm)

20, 28, 38, 48, 58 in.(508, 711, 965, 1219, 1473 mm)

20, 28, 38 in.(508, 711, 965 mm)

28, 38, 48, 58 in.( 711, 965, 1219, 1473 mm)

A

A

A

—

—

—

32 or 38(813 or965)

32 or 38(813 or965)

90(2286)

EUSERC Utility Meteringg

Table 7.32 EUSERC Utility Dimensions

Depth Reference Chart

a Verify dimensions with local utility requirements.b See page 129 for dimensions.c See page 129 for unit space of disconnect devices.

EUSERC Utility Notes:d Not applicable for EUSERC.e Busway available for SB3 only.f Not allowed by Los Angeles Department of Water and

Power or San Diego Gas & Electric.g Some jurisdictions do not allow multi-main service

equipment.h 400 / 1000A fed by 500 KCMIL — No pull box required.

400 / 1000A fed by 750 KCMIL — 10.0" pull box required.


Height Width Depth - Minimum — Letters Reference Chart Below

Top Entrance Cables 4

or Busway 5Bottom Entrance Cables Only 4

Non-Bussed Pull Section 6Bottom Entrance Cables

Invert For Top Feed

Sentron™ SwitchboardsService Sections — Utility Metering and Multi-Main Disconnects

Hot Sequence Only


Dimensions

Max.Amp.Rating

DeviceType SB1 SB2 SB3 RCIIISB1 SB2 SB3 RCIII H1

PullBoxH2 W1 W2 W3

Non-Bussed

Device AppliesTo Switchboard

BussedUG

Depth Available


Height Width

Letters ReferenceChart BelowD

Molded Case Circuit Breakers

400

600

800

Pull Sectiona

JXD2, JXD6,JD6, HJD6 A C E J

— C E J— — E JA C E J

JC E J— — E JA C E J

— C E J— — E JB D F J

— D F J— — F JB D F J



— D F J— G H J— G H J

— D F J— D F J— D F J— G H J— G H J— G H J

— — J J— — J J— — J J— — J J— — J J— — J J

B D F JB D F JB D F JB D F JB D F J

— D F J— D F J— G G J— G G J— G G J

B D F J

• • • •

• • •• •

• • • •• • • •

• •• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• • •

—

——• • •

• • •• • •• • •• • •• • •• • •

• •• •• •• •• •• •

• • • •• • • •• • • •• • • •• • • •

• • •• • •• • •• • •• • •

•••

• • •

SJD6CJD6, SCJD6

1000

NXD6, ND6,HND6SND6CND6, SCND6

1200

NXD6, ND6,HND6SND6

1600

PXD6, PD6,HPD6SPD6

CND6, SCND6

CPD6, SCPD6

2000

2500c

RXD6, RD6,HRD6SB2000SSB2500S

800

1600 Type SBEncasedSystemsBreaker

Type RL,RLF LowVoltagePowerCircuitBreaker

2000

2500c

3000c

4000c

3000c SB3000S

LXD6, LD6, HLD6SLD6CLD6, SCLD6

SMD6CMD6, SCMD6

LMXD6, LMD,HLMXD6, HLMD6,MXD6, MD6, HMD6

20 (508)

20 (508)

32 (813)

32 (813)

32 (813)

32 (813)

14 (356)

20 (508)

32 (813)

—

—

15 (381)

b

20 (508)

— G H J—• • •3200 STD6, SHTD6, SHHTD6 25 (635)

10 (254)

20 (508)

20 (508)

20 (508)

32 (813)

32 (813)

10 (254)

15 (381)

—

—

15 (381)

15 (381)

15H (381)

2

20 (508)

—20 (508)

20 (508)

90 (2286)

38 (965)

90 (2286)

90 (2286)

90 (2286)

14 (356)

38(965)

38(965)

38(965)

46(1168)

46(1168)

Table 7.33 Standard Utility — Hot Sequence (C.T.’s on Line Side of Main)

Insulated Case Circuit Breakers — Stationary Mountedd

800

1600

2000

2500e

3000e

4000e

Vacu-Break

BoltedPressure

800

1000

1200 800

AA

C E JC E J

A C E JA C E J

• • • •• • • •• • • •• • • •

HCP

400

600

800

1200

1000

1200

1600

2000

2500

3000

4000

Low Voltage Power Circuit Breakers — Draw-Out Fusible and Non-Fusible

Switches

32 (813)

A

B

C

E

F

G

20 in. (508 mm) 20, 28, 38, 48, 58 in. (508, 711, 965, 1219, 1473 mm)28 in. (711 mm) 28, 38, 48, 58 in. ( 711, 965, 1219, 1473 mm)20, 28, 38 in. (508, 711, 965 mm) 38 in. (965 mm)

D H28, 38 in. (711, 965 mm) 38, 48, 58 in. (965, 1219, 1473 mm)J 48, 58 in. (1219, 1473 mm)

Depth Reference Chart a Minimum widths shown. Refer to page 129 for optionawidths.

b Not required.c C.T. compartment must be mounted in a bussed pull

section.d For Types SB3 and RCIII, drawout SB breakers are

available as an option. Minimum depth SB3 – 38 in. (965 mm), RCIII – 48 in. (1219 mm).

e For fusible RLF breaker, utility compartment must bemounted in a bussed pull section.

f Busway available for Type SB3 only.

Top Entrance Cablesor Busway 6

Bottom Entrance withNon-Bussed Pull Section

Cables Only

Bottom Entrance withBussed Pull Section

Cables Only

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Sentron™ SwitchboardsService Sections — Utility Metering & Single Main Disconnects (Standard Utilities)

Dimensions


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Max.Amp.Rating

DeviceType SB1 SB2 SB3 RCIII1 2 3SB2SB1 SB3 RCIII H1

PullBoxH2

Fig.1-3a

W1

Fig.2a

W2Fig. 3W3


DeviceAppliesTo Figure

Depth Available


Height Width - Minimum Letters Reference

Chart BelowD


400

600

800


— C E J— — E JA C E J— C E J— — E JA C E J

— C E J— — E JB C E J

— C E J— — E JB D B J

— B B J— — B JB D B J

— B B J— — B JB D B J

— B B J— G H J— G H J


— — J J

— — J J— — J J— — J J— — J J— — J J

B D F J

B D F JB D F JB D F J

B D F J

B D F JB D F J— G H J— G H J— G H J

B D F J

• • • •

• • •• •

• • • •• • •

• •• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• •

• • • •

• • •• • •

—

———

• • •

• • •

• • •• • •• • •• • •• • •

• •

• •• •• •• •• •

• • • •

• • • •• • • •• • • •

• • • •

• • • •• • • •

• • •• • •• • •

• • • •

✓

✓

✓

✓

✓

✓✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓✓✓✓✓

✓

✓✓✓✓✓

✓

✓✓✓

✓

✓✓✓✓✓

✓

✓

✓

✓

✓

✓

✓✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓✓✓✓✓

✓

✓✓✓✓✓

✓

✓✓✓

✓

✓✓✓✓✓

✓

✓

✓

✓

✓

✓

✓✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓✓✓✓✓

✓

✓✓✓✓✓

✓

✓✓✓

✓

✓✓✓✓✓

✓

SJD6CJD6, SCJD6

1000NXD6, ND6,HND6SND6CND6, SCND6

1200NXD6, ND6,HND6SND6

1600PXD6, PD6,HPD6SPD6

CND6, SCND6

CPD6, SCPD6

2000

2500 c

RXD6, RD6,HRD6SB2000SSB2500S

800



20002500 c3000 c4000 c

3000 c SB3000S—52

(1321)32(813)

G H J—• • • ✓ ✓ ✓3200 c STD6, SHTD6, SHHTD6


SMD6CMD6, SCMD6

MXD6, MD6,HMD6

38 (965)

32 (813)

32 (813)

32 (813)

46 (1168)

52 (1321)

52 (1321)

46 (1168)

52 (1321)

46 (1168)

14 (356)

20 (508)

32(813)

—

—

b

20 (508)

38 (965)

10 (254)

32 (813)

46 (1168)

32 (813)

38 (965)32 (813)

32 (813)

32 (813)

32 (813)

10 (254)

15 (381)

—————— —

—

—

—

——

——

———

10(254)

20 (508)

—

38 (965)

90 (2286)

90 (2286)

90 (2286)

90 (2286)

32(813)

38(965)

38(965)

38(965)

46(1168)

46(1168)

Table 7.34 EUSERC Utility — Hot Sequence (C.T.’s on Line Side of Main)

Insulated Case Circuit Breakers — Stationary Mounted d

800

160020002500 e3000 e

A C E JA C E JA C E JA C E J

• •• •• •• •• •

• •• •• •

✓✓✓✓

✓✓✓✓

✓✓✓✓

HCP

—10 (254)

400 600 8001200

4000 e

Vacu-Break

BoltedPressure

800

10001200 800

1000120016002000250030004000


Switches

A

B

C

E

F

G

20 in. (508 mm) 20, 28, 38, 48, 58 in. (508, 711, 965, 1219, 1473 mm)28 in. (711 mm) 28, 38, 48, 58 in. ( 711, 965, 1219, 1473 mm)20, 28, 38 in. (508, 711, 965 mm) 38 in. (965, mm)



a Minimum widths shown. Refer to page 129 for optionalwidths.

b Not required.c C.T. compartment must be mounted in a bussed pull

section.d For Types SB3 and RCIII drawout SB breakers are

available as an option. Minimum depth SB3 – 38 in. (965 mm), RCIII – 48 in. (1219 mm).

e For fusible RLF breaker, utility compartment must bemounted in a bussed pull section.

f Busway available for Type SB3 only.

20 (508)

20 (508)

Top Entrance Cablesor Busway 6


Cables Only


Cables Only

Sentron™ SwitchboardsService Sections — Utility & Metering Single Main Disconnects (EUSERC Utilities)


Sentron™Sw

itchboards

7

Dimensions

Max.Amp.Rating

DeviceType SB1 SB2 SB3 RCIIISB1 SB2 SB3 RCIII H1 W1 W2 W3

Non-Bussed


BussedUG

Depth Available


Height Width

Letters ReferenceChart BelowD


400

600

800

Pull Box


— C E J— — E JA C E J— C E J— — E J

A C E J

— C E J— — E JA C E J— C E J— — E JA C E J

— C E J— — E JB D F J

— D F J— — F JB D F J— D F J— B H J

— G H J


— — J J— — J J— — J J— — J J— — J J— — J J

B D F JB D F JB D F JB D F JB D F J

B D F JB D F J— G H J— G H J— G H J

B D F J

• • • •

• • •• •

• • • ••• •

• •

• • • •

• • •• •

• • • •• • •

• •• • • •

• • •• •

• • • •

• • •• •

• • • •• • •• • •

—

—

—• • •

• • •• • •• • •• • •• • •• • •

• •• •• •• •• •• •

• • • •• • • •• • • •• • • •• • • •

• • • •• • • •

• • •• • •• • •

• • • •

SJD6CJD6, SCJD6

1000 NXD6, ND6, HND6SND6CND6, SCND6

1200

NXD6, ND6,HND6SND6

1600

PXD6, PD6,HPD6SPD6

CND6, SCND6

CPD6, SCPD62000

2500

RXD6, RD6, HRD6SB2000SSB2500S

800



20002500

30004000

3000 SB3000S

• • •3200 STD6, SHTD6,SHHTD6


SMD6CMD6, SCMD6

MXD6, MD6, HMD6,LMXD6, LMD6,HLMD6, HLMXD6

20 (508)

20 (508)

32 (813)

38 (965)

32 (813)

38 (965)

32 (813)

38 (965)

32 (813)

32 (813)38 (965)

14 (356)

32 (813)

32 (813)

20 (508)

—

38 (965)

20 (508)

20 (508)

20 (508)

32 (813)

14 (356)

38 (965) —

—

38 (965)

38 (965)

—46 (1168)

46 (1168)

90 (2286)

90 (2286)

90 (2286)

90 (2286)

Table 7.35

Insulated Case Circuit Breakers — Stationary Mounted a

800

160020002500b

3000b

4000b

Vacu-Break

HCP

BoltedPressure

800

A C E JA C E JA C E JA C E J

• • • •1200

• • • •800

• • • •600

• • • •400

10001200

800

1000

1200

1600

2000

2500

30004000


Switches


a For Types SB3 and RCIII, drawout SB breakers areavailable as an option. Minimum depth SB3 38 in.(965 mm), and RCIII 48 in. (1219 mm).

b For fusible RLF breaker, utility compartment must bemounted in a bussed pull section.

A

B

C

E

F

G

20 in. (508 mm) 20, 28, 38, 48, 58 in. (508, 711, 965, 1219, 1473 mm)28 in. (711 mm) 28, 38, 48, 58 in. ( 711, 965, 1219, 1473 mm)20, 28, 38 in. (508, 711, 965 mm) 38 in. (965, mm)


Top Entrance Cables Pull Box



Bottom Entrance

Sentron™ SwitchboardsService Sections — Non-Utility Type with/wo Customer Metering & Main Disconnect

SB1 and SB2 combination service / distri-bution sections house both a main ser-vice disconnect device and branch distrib-ution disconnects. Switchboards can befurnished with “Suitable for Use as

Service Equipment” labels, but includeno provisions for utility metering or cus-tomer metering.Branch circuit device unit space varies,depending on the rating and consequent

physical size of the main disconnectdevice. If more unit space is requiredthan is shown in the tables below, one ormore additional distribution sectionsmust be added.

Sentron™ SwitchboardsCombination Sections — Types SB1, SB2, and SB3

Dimensions


Sent

ron™

Switc

hboa

rds

7

Combination Service Disconnect and Distribution Sections — MCCB Main

PullBoxH2

Max.Amp.Rtg.

BreakerType

Svc.Ent.Lbl.

Mtg.Posi-tion

MainLoca-tionLSB1 SB2 SB3H1 With W4

Fig.4 &5

Device Applies To Switchboard

Letters ReferenceChart Below

Unit Space U1 e f

Depth Available ConduitArea


Height Width

D2


D1

400

e fUnitSpace U2

JXD2, JXD6,JD6, HJD6

Horiz. k

Yes

Yesh

Vert.Top

K

3.00(76)

ToporBot-tom

2.50(64)

A C E B D F

A C E B D FA C E A C E

— C E B D F— — E B D FA C E B D F

— C E B D F— — E B D FA D E B D F

— D E B D F— — F B D FB D F B D F— D F B D F— — F B D FB D F B D F

— C E B D F— — E B D FA C E B D F— C E B D F—

—

— E B D F

• • •

• • •• • •

• • •

• • •

• • •

• • •

• • •

• •

• •

• •

• •

• •

• •

•

•

•

•

•

•

SJD6

600

800

LXD2, LXD6,HLD6, SLD6

CJD6, SCJD6

CLD6, SCLD6

MXD6, MD6, HMD6SMD6CMD6,SCMD6

1000

NXD6, ND6, HND6

1600

PXD6, PD6, HPD6SPD6CPD6, SCPD6

2000 RXD6, RD6, HRD6

SND6CND6, SCND6

1200

NXD6, ND6, HND6

SND6CND6, SCND6

32(813)or38(965)

38(965)

—

—

38(965)

38(965)

W3

Fig.3

W2

Fig.2

W1

Fig.1

Without

Load Through-Bus

38(965)g

38(965)g

—

45.00(1143)

52.50 (1334)52.50 (1334)40.00 (1016)42.50 (1080)

53.75 (1365)53.75 (1365)

52.50 (1334)52.50 (1334)52.50 (1334)52.50 (1334)

40.00 (1016)42.50 (1080)52.50 (1334)52.50 (1334)52.50 (1334)52.50 (1334)

40.00 (1016)42.50 (1080)52.50 (1334)52.50 (1334)

—

32(813)

32(813)

46.25j

(1175)53.75 (1365)56.25 (1429)

——30.00(762)——

90(2286)

i

Table 7.36 Main Breaker with or without Ground Fault Protection

A

B

C

D

E

F

20 in.(508 mm)

28, 38in.(711, 965 mm)

28 in.(711 mm)

20, 28, 38, 48, 58 in.( 508, 711, 965, 1219, 1437 mm)

20, 28, 38 in.(508, 711, 965 mm)

28, 38, 48, 58 in.( 711, 965, 1219, 1437 mm)

Depth Reference Chart a Unit may be inverted.b Load cables must exit bottom.c Refer to Table 7.41 for dimensions.d Not available with load through bus.e Ground fault, if applied, uses 10 in. (254 mm) of unit space.f See page 128 for unit space of disconnect devices.g 46 in. (1168 mm) wide if 750 kcmil lugs required.h Service entrance label at 480V requires ground fault.i Pull box height: Standard 500 kcmil lugs = 10 in. (254 mm)

Alternate 750 kcmil lugs = 15 in. (381 mm)j For use with 100% rated breakers.k Vertical mounted when using 100% rated devices.

45.00j

(1143)

—

38(965)

LMD, HLMD

400-1200AMain Breaker Without GFP

400-1200AMain Breaker

With GFP

1600-2000A Main BreakerWith or Without GFP

400-1200A MCCB With Line Through Bus

1600-2000A MCCB With Line Through Bus

Fig. 1 Top Entrancea Fig. 3Fig. 2 Bottom Entrancea Fig. 4 Fig. 5



Sentron™Sw

itchboards

7

DimensionsCombination Service Disconnect and Distribution Sections Main Vacu-Break®

H3

Top Entrance and Invert for Bottom Entrance

Top Entrance and Invert for Bottom Entrancef

Bottom EntranceInvert for Top Entrance

Bottom Entrance Invert for Top Entrance

400 and 600A Vacu-Break 800 and 1200A Vacu-Break 400 and 600A Vacu-Breakg 800 and 1200A Vacu-Break

TopPullBoxH2

MaximumAmpereRating

ServiceEntranceLabel

MainLocationLSB1 SB2 SB3H1

WithLoadThroughBus

Applies To Switchboard


Unit Space - H3 eDepth Available

ConduitArea


Height Width

D2


D1

400

UnitSpaceH4 e

Yes

Yes c

K

A ToporBottom

ToporBottom

C E B D F

A C E B D F

B D F B D F

B D F B D F

• • •

• • •

• • •

• • •

600

800

1200

W

WithoutLoadThroughBus

2.50(64)

3.00(76)

30.00 (762) 30.00 (762)30.00 (762)

36.25 (921)43.75 (1111)43.75 (1111) 38.00 d

(965)

38.00 (965)

33.75 (857)41.25 (1048)—

90.00(2286)

Table 7.37—400–1200A Vacu-Break Switch Main

10.00 f(2.54)

400 & 600AVacu-Break

MainSwitch

A

B

C

D

E

F

20 in. (508 mm)

28, 38 in. (711, 965 mm)

28 in. (711 mm)

20, 28, 38, 48, 58 in. ( 508, 711, 965, 1219, 1473 mm)

20, 28, 38 in. (508, 711, 965 mm)

28, 38, 48, 58 in. ( 711, 965, 1219, 1473 mm)

Depth Reference Charta Load cables must exit bottom.b Refer to page 129 for dimensions.c Service entrance label at 240V only.

d 38 in. (965 mm) wide standard, 32 in. (813 mm) wideavailable as an option.

e See page 130 for unit space of disconnect devices.f 15 in. (381 mm) pull box when alternate 750 kcmil lugs.


Dimensions


Sent

ron™

Switc

hboa

rds

7

Conduit AreaTop or Bottom

38(711 mm)

Conduit AreaTop or Bottom

38(711 mm)

MaximumAmpereRating



750kcmilLugs



Top Pull Box — H2

Depth Available

ConduitAreaf


Height

SB1 SB2 SB3

D

800

UnitSpaceH3 c

Yes

Yes d

K

Top

B D F

B D F

B D F

B D F

• • •

• • •

• • •

• • •

1200

1600

2000

500kcmilLugs

2.50(64)

3.00(76)

30(762)

20(508)

90.00(2286)

10(254)

Table 7.39—800–2000A Bolted Pressure Switch Main, with or without Ground Fault

A

B

C

D

E

F

20 in. (508 mm)

28, 38 in. (711, 965 mm)

28 in. (711 mm)

20, 28, 38, 48, 58 in. ( 508, 711, 965, 1219, 1473 mm)

20, 28, 38 in. (508, 711, 965 mm)

28, 38, 48, 58 in. ( 711, 965, 1219, 1473 mm)


a Load cables must exit bottom.b See page 129 for dimensions.c See page 130 for unit space of disconnect devices.d On bolted pressure switch rated 1000A or greater without ground fault, service entrance label for 240V only.e Not available with load thru bus.f Conduit restricted to rear 10 in. (254 mm) for inverted

bottom entrance.

Bottom EntranceTop Entrance

Combination Service Disconnect and Distribution Sections HCP Switch and Bolted Pressure Switch

MaximumAmpereRating




Letters Reference Chart Below

H3 c

Depth Available

Conduit Area


Height Width D2


D1

400

Yes

K

ATop or Bottom

C E B D FA C E B D FB D F B D FB D F B D F

• • •• • •• • •• • •

600 800

1200

W

2.50(64)

3.00(76)

38.00 (965)

90.00(2286)

Table 7.38 400–1200A HCP Switch Main

46.25(1175)

Unit Space

H3

400-1200AHCP

Main Switch

Top Entrance and Invert for Bottom Entrance

Bottom EntranceInvert for Top Entrance

400A – 1200A HCP 400 – 1200A HCPe

400-1200AHCP

Main Switch

Sentron™ SwitchboardsDistribution Sections — Types SB1, SB2, and SB3


Sentron™Sw

itchboards

7

Dimensions

a

Main Lug Only –– 400A through 2000A

MaximumAmpereRating

ServiceEntranceEquipmentc d

Suitable for Use As

400

SB1

Depth Available

Letters refer ToChart BelowD

Width

W aCrimp600 kcmil Max.

Alternate750 kcmil

Standard500 kcmil

AICRating

Section Configuration H1

Lugs

Distribution Unit Space a

SB2 KSB3 L

A

C

E

ECA

20 in.(508 mm)

90.00(2286)

62.50(1588)

200,000

200,000

200,000

200,000

42,000

100,000

42,000

100,000

42,000

100,000

42,000

100,000

60.00(1524)

55.00(1397)

32 or 38(813 or965)

32 or 38(813 or965)

38(965)

38(965)

38(965)

2.50(64)

3.00(76)

20, 28, 38, 48, 58 in.(508, 711, 965, 1219, 1473 mm)

Single without Through-Bus Only

600 ECA60.00(1524)

56.25(1429)

55.00(1397)

Single without Through-Bus Only Yes

Yes

800

ECA58.75(1492)

52.50(1334)

53.75(1365)


ECA

ECA

ECA

ECA

ECA

ECA

51.25(1302)

45.00(1143)

46.25(1175)Multi With

Through-BusYes ECA

45.00(1143)

38.75(984)

45.00(1143)

1200

57.50(1461)

50.00(1270)

53.75(1365)


50.00(1270)

42.50(1080)

46.25(1175)Multi With

Through-Bus Yes

1600


Multi With Through-Bus Yes

45.00(1143)

38.75(984)

45.00(1143)

2000


Multi With Through-Bus Yes

20, 28, 38 in.(508, 711, 965 mm)

Table 7.40—Main Lug Only Unit Space

Depth Reference Charta 46 in. (1168) width available as an option.b See page 130 for unit space of disconnect devices.c Maximum of 6 disconnect devices only.d SUSE service disconnects 1000A or higher on sodily

grounded wye systems of more than150V to groundrequired ground fault protection.Ground fault uses 10 in. (254 mm) of unit space. SeeNEC 230-95 for additional details. This applies to branchdevices 1000A or larger on non-service equipmentunless ground fault protection is provided upstream atthe service. See NEC 240-13 for further information.


Height

a

Top Feed Bottom Feed

Bottom Entrance


Dimensions


Sent

ron™

Switc

hboa

rds

7

Max.

Amp.

Rating

Device

Type SB1 SB2 SB3 1P 2P 3P

Device

Applies To

Switchboard

Total Poles

Available

Unit Space H2


Height

Twin

Mounted

Single

Mounted

Width

Enclosure

Minimum

W

Branch Breakers

Main Breakers

8

2

6

2 2

2 2

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

—

—

—

—

—

—

—

—

—

—

——

—1

—

—

—

—

—

2 2—

2

—

2

2

2 2

• • •• • •• • •

• • •

• • •• • •

• • •

• • •

•

• • •

• •••

• •

••

•

•

•

• • •

• • •

• ••

• • •• •

•

• • ••

• •

••

• •

• • •

••

• • •

• ••

• • •

• • •• • •• • •• • •• • •• • •• • •• • •• • •• • •• • •• • •

• ••

• • •

ED2, ED4, HHED6 100

BL, BLH, HBL, BQD

ED2, ED4, ED6, HED4, HHED6

125

QJ2, QJH2, QJ2-H, HQJ2-H 225

CFD6 250

400

FXD6, FD6, HFD6, HFXD6,HHFD6, HHFXD6

CFD6 250FXD6, FD6, HFD6, HFXD6

LXD6, LD6, HLD6, HLXD6,HHLD6, HHLXD6

600

CLD6SCLD6

SLD6, SHLD6

MXD6, MD6, HMD6, HMXD6 800

CMD6SMD6, SHMD6

NXD6, ND6, HND6, HNXD61200

CND6, SCND6SND6, SHND6

MXD6, MD6, HMD6, HMXD6

800

CMD6SMD6, SHMD6

NXD6, ND6, HND6, HMXD61200

CND6, SCND6SND6, SHND6

HED4, HHED6, ED2, ED4,ED6 With AccessoriesCED6CED6 With Accessories

SJD6, SHJD6

SCJD6CJD6

JXD2, JXD6, JD6, HJD6,HJXD6, HHJD6, HHJXD6

400 SJD6, SHJD6

JXD2, JXD6, JD6, HJD6,HJXD6, HHJD6, HHJXD6

600

LXD6, LD6, HLD6, HLXD6,HHLD6, HHLXD6SLD6, SHLD6CJD6,SCJD6

CJD6,SCJD6

3.75 (95)

10.00 (254)

6.25 (159)

3.75 (95)32.00 (813)

6.25 (159) 5.00 (127)

5.00 (127)

— —

5.00 (127)8.75 (222)

32.00 (813)

8.75 (222)

8.75 (222)

32.00 (813)

32.00 (813)

38.00 (965)

Vacu-Break

10.00 (254)

10.00 (254)

2.50 (64)a

5.00 (127) —

10.00 (254)7.50 (191)

15.00 (381)

16.25 (413) 16.25 (413)

7.50 (191)

10.00 (254)b

—

—

7.50 (191) —

7.50 (191)10.00 (254)

15.00 (381)

10.00 (254)c——

—

38.00 (965)

38.00 (965)

32.00 (813)2 2 8.75 (222) — 38.00 (965)

Table 7.41 Unit Space Requirements — Molded Case Circuit Breakers

Max.Amp.Rating

30-30

30-30

30-60

60-60

60-100

100-100

200-200

400-1200

100

200

400

600

SwitchType SB1 SB2 SB3

DeviceApplies ToSwitchboard 240V 600V


Mounting Height

Twin Twin SingleSingle

EnclosureMinimumW

Table 7.42 Unit Space Requirements — Branch SwitchesWidth

a The 2.5 in. (64) high unit is suitable for NEC Class H, K1, and K5 fuses only. Class R rejection type fuse holdersare not available.

b Unit rated 600V, factory configured to accept 250V class H, K or R Fuses. Field convertible to accept class J Fuses.

5.00 (127)

32.00 (813)

c Factory configure to accept Class J Fuses only.

186

LMD6, LMXD6, HLMD6, HLMXD6

1• • •

LMD6, LMXD6, HLMD6, HLMXD6

HCP

Conduit Area Top or Bottom


Unit Space for Disconnect Devices

b D for Type SB2 = 28, 38 in. (711, 965 mm)D for Type SB3 = 28, 38, 48, 58 in. (711, 965, 1219, 1473 mm)

b D for Type SB2 = 28, 38 in. (711, 965 mm)D for Type SB3 = 28, 38, 48, 58 in. (711, 965, 1219, 1473 mm)

SB3 only

2 High Vacu-Break Distribution Section

2 High Bolted Pressure SwitchDistribution Section


b

Vacu-Break Combination Distribution Section



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Dimensions

Amp.Rtg.

400

600

800

1000

1200

1600

2000

2500

3000

4000

5000

6000

SB1 SB2 SB3 RCIII SB1

Depth AvailableWidthWidth

Std. cStd. withCustomer Metering c

With UtilityMetering c

EUSERC Pull Section Dimensions in Inches (mm)

Letter ReferenceChart Above

Depth Available

Letter ReferenceChart Above

Std.

Bussed with UtilityMetering

Std.

Hgt.

H Opt.

Standard Pull Section Dimensions in Inches (mm)

Non-Bussed Bussed

Hgt.

H Opt. cBussed

SB2 SB3 RCIII

14(356)

90(2286)

20(508)

20(508)

32(813)

38(965)

32(813)

38(965)

46(1168)

32(813)

46(1168)

52(1321) —46

(1168)

20(508)

38(965) or46d

(1168)

46(1168)

32(813)

——

32(813)

38(965)

46(1168)

38(965)

38(965)

46(1168)

38(965)

A,B C E J A,B C E J

A,B C E J A,B C E J

A,B C E J A,B C E J

A,B C E J A,B C E J

A,B C E J B B,G B, H J

A,B C E J B B,G H J

A,B C E J B B,G H J

— G d H d J G H J— G d H d J G H J

— G H J ——— G H J

— — H J— —

J— — H J J

90(2286)

Table 7.44 Non-Bussed & Bussed Pull Sections — Standard Utilities and EUSERC Utilities

c Top or bottom feed.d Pull sections without utility meters can be 28 in. (711 mm) deep minimum.e Determined by specific utility used.

52(1321)

D D

• • •• •• •

• •

2.5(64)

90.0(2286)

65.0(1651)

32.0 or(813)

38.0b

(965)

A C E— C E— G H

— G H62.5(1588)

38.0 or(965)

46.0(1168)

3.0(76)

MaximumRiserAmperage

WithMaximumThrough-BusAmperage

2000

3000

2000

3000

4000

4000

SB1 SB2 SB3

As Applied toSwitchboard

SB1H1 W

UnitSpaceH2 a SB2 SB3 K L

Letters ReferenceChart Below Conduit

Area


Height Width

Table 7.43 Through-Bus Fed Dimensions

a See page 128 for unit space of disconnect devices.b 46.00 (1168) width optional

A

B

C

E

G

20 in.(508 mm)

20, 28, 38, 48, 58 in.(508, 711, 965, 1219, 1473 mm)

28 in.(711 mm)

J 48, 58 in.( 1219, 1473 mm)

20, 28, 38 in.(508, 711, 965 mm)

38 in.(965, mm)

H 38, 48, 58 in.(965, 1219, 1473 mm)


D

Depth Available

H

Width

H

Width

H

Width

Non-BussedPull Section

BussedPull Section

Bussed Pull Sectionwith Utility Compartment

Through-Bus Fed

Non-Bussed and Bussed Pull Sections

Through-Bus FedDistribution Sections

Molded Case Circuit Breakers forCombination Motor StarterApplications

Application Note: ETI instantaneous- trip circuit breakersare recommended for use in combinationmotor starters to provide selective shortcircuit protection for the motor branch cir-cuit. The adjustable instantaneous-trip

feature provides for a trip setting slightlyabove the peak motor inrush current.With this setting, no delay is introducedin opening the circuit when the faultoccurs. Since these circuit breakers haveno time-delay trip element, they must beused in conjunction with, and immedi-ately ahead of, the motor-running over-current protective device.

The voltage and interrupting rating of thecircuit breaker should be checked toassure that they are adequate for theelectrical system. ETI circuit breakers areUL recognized components and must beused if the switchboard section is also tobe UL Listed.

Sentron™ SwitchboardsDistribution Sections — Type SB3 Only

Dimensions


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3

5

10

25

50

100

150

225

SingleSingleTwinBreakerType 480V bc240V220(208)V

1 32 (813)——— 5 (127) 0.5 0.5 2 32 (813)—5 (127)

2 2 3 32 (813)—5 (127)5 5 10 32 (813)—5 (127)

15 15 30 32 (813)—5 (127)30 30 60 32 (813)—5 (127)40 40 75 32 (813)—5 (127)50 50 100 32 (813)—5 (127)

ED b

FJ6, CFD

Min. SectionWidth inches (mm)

Mounting Height in Inches (mm)Maximum 3Ø Ratings

Table 7.45 ETI Circuit Breakers (Instantaneous Trip Only)For Branch-Circuit Use with AC Full Voltage Motor Starters

AmpereRating

30-30

SingleTwin SingleTwinWith NECFuse

With Dual-Element Fuse

With NECFuse

With Dual-Element Fuse

32— ——— — 2.50(64)3 7.5

Min.Sec.Width

Mounting Height in Inches (mm)Horsepower Ratings

240V AC 480V AC 240V AC 480V AC

Table 7.46 Vacu-Break Fusible SwitchesFor Branch Circuit Use with AC Combination Full Voltage Starters d

aThe 2.50 in. (64 mm) high unit is suitable for NEC Class H and K5 fuses only. Class R rejection type fuse holders are notavailable.

a

30-30 32——5.00(127)3 7.5

30-60 32——5.00(127)3–7.5 7.5–15

60-60 32——5.00(127)7.5 15

60-100 32——7.50(191)7.5–15 15–30

100-100 32——7.50(191)

7.50(191)

7.50(191)

7.50(191)

7.50(191)

7.50(191)

10.00(254)

15 30

100 32———

200 32——50 100

100

100

100

100

5 10

5–15 25

15 25

15–25 25–50

25 50

25 50

10.00(254)

10.00(254)

7.50(191)

25 50

200-200

400

600

32———

—

—

—

—

— —

—

—

— —

10.00(254)50

FJ6 c

b100,000 kA at 480V with E–Frame and CFD–Frame breakers.c65,000 kA at 480V with F–Frame Breakers.d100,000 kA at 480V with Class J or Class RK5 fuses.

50

75

15.00(381)15.00(381)

15.00(381)15.00(381)

38

38

NEMAStarter Size

0 — 5 b(127)

32(813)

10(254)

32(813)

15(381)

32(813)

15(381)

32(813)

5 b(127)

32(813)

Left Right

0 0

1 —

1 0

1 1

2 —

2 0

2 1

2 2

3 —

3 0

3 1

3 2

3 3

4 —

Min. Encl.WidthIn. (mm)

Unit spaceMtg. Ht.In. (mm)

Table 7.47 Full Voltage Non–Reversing Starters Class A20

NEMAStarterSize

0

220(208)V

Voltage AC

240V 480V

1

2

3

4

37.5

102540

37.5

153050

5102550

100

Table 7.48 Maximum 3 PhaseHorsepower Rating

a Increase to 7.50 in. (191 mm) when pilot light or controltransformer is required.

Sentron™ SwitchboardsDistribution Sections — Type RCIII


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Dimensions

ED2, ED4, ED6,HED4, HHED6

7.50(191)

1 to 6 1 to 8✔ ✔

Max.AmpereRating

100

BreakerType

Mounting

Number ofBreakersFor Width

38 Inches(965 mm)Plug-InFixed

32 Inches(813 mm)

Unit Space in Inches(mm)

Table 7.49 Individually Mounted Molded CircuitBreakers

CED6 12.50(318)

1 to 6 1 to 8✔ ✔

FXD2, FD6, HFD6,HHFD6

10.00(254)

1 to 4 1 to 6✔ ✔

250CFD6 15.00

(381)1 to 4 1 to 6✔ ✔

RXD6, RD6, HRD6, HHRXD6

27.50(699)

1 or 2 1 or 2✔ —2000

JXD2, JXD6, JD6, HJD6, SJD6, HHJXD6,HHJD6, SHJD6

12.50(318)

1 or 2 1 or 2✔ ✔

400

CJD6, SCJD6 20.00(508)

1 or 2 1 or 2✔ ✔

LXD6, LD6, HLD6,SLD6, HHLXD6,HHLD6, SHLD6

12.50(318)

1 or 2 1 or 2✔ ✔

600

CLD6, SCLD6 20.00(508)

1 or 2 1 or 2✔ ✔

✔ ✔

NXD6, ND6, HND6,SND6, HHNXD6,HHND6, SHND6

22.50(572)

1 or 2 1 or 2✔ ✔

1200

CND6, SCND6 22.50(572)

1 or 2 1 or 2✔ ✔

MXD6, MD6, HMD6,SMD6, HHMXD6,HHMD6, SHMD6

22.50(572)

1 or 2 1 or 2

800

CMD6, SCMD6 22.50(572)

1 or 2 1 or 2✔ ✔

PXD6, PD6, HPD6,SPD6, HHPXD6,HHPD6, SHNPD6

27.50(699)

1 or 2 1 or 2✔ —

1600

CPD6 27.50(699)

1 or 2 1 or 2✔ —

1-10 — #14 Cu. or1-10 — #15AI.

1

AmpereRating

Number of BarrelsPer Phase

100

1-750 — 250 kcmil or2-250 kcmil — 3/0 Cu.-AI.

1 400

1-750 — 250 kcmil or2-250 kcmil — 3/0 Cu.-AI.

2 600

1-750 kcmil — 4/0 Cu.-AI. or2-3/0 — 400 kcmil AI.or2-3/0 — 300 kcmil Cu.

3 800

1-750 kcmil — 4/0 Cu.-AI. or2-3/0 — 400 kcmil AI.or2-3/0 — 300 kcmil Cu.

41200

1-350 kcmil — #16 Cu.-AI 1 225

1-750 kcmil — 3/0 Cu.-AI. 61600

1-750 kcmil — 3/0 Cu.-AI. 72000

Wires per Barrel

Table 7.50 Standard Branch Load ConnectorsBolt-On and Plug-In

1 Transition section required when main disconnect is a service section with the following:

Molded Case Circuit Breaker 400A-3200AVacu-Break Switch 800A-1200AHCP Switch 400A-1200ABolted Pressure Switch 800A-4000ALow Voltage Power Air Circuit Breaker 800A-4000AInsulated Case 800-4000A

78 in (1982 mm) from floor max. allowed by NEC 380-8(a)CL


Dimensions


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32.00 (812.8) CUB38.00 (965.2) CUB

12.50(317.5)

12.50(317.5)

6 4 2 1 3 5

68 4 2 1 3 5 7

32.00 (812.8) CUB38.00 (965.2) CUB

10.00(254)

10.00(254)

6 4 2 1 3 5

68 4 2 1 3 5 7

32.00 (812.8) CUB38.00 (965.2) CUB

10.00(254)

10.00(254)

4 2 1 3

6 4 2 1 3 5

32.00 (812.8) CUB38.00 (965.2) CUB

12.50(317.5)

12.50(317.5)

2 1

2 1

32.00 (812.8) CUB38.00 (965.2) CUB

7.50(190.5)

7.50(190.5)

6 4 2 1 3 5

68 4 2 1 3 5 7

32.00 (812.8) CUB38.00 (965.2) CUB

20.00(508)

20.00(508)

2 1

2 1

32.00 (812.8) CUB38.00 (965.2) CUB

22.50(571.5)

22.50(571.5)

2 1

2 1

38.00 (965.2) CUB

27.50(698.5)

2 1

38.00 (965.2) CUB

27.50(698.5)

2 1

(100A) ED2, ED4, ED6, HED4, HHED6Stationary or plug-in mounted 5.0 in.(127.0 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(100A) CED6Stationary or plug-in mounted 5.0 in.(127.0 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(250A) FXD6, FD6, HFD6, HHFD6Stationary or plug-in mounted 2.5 in.(63.5 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(250A) CFD6Stationary or plug-in mounted 2.5 in.(63.5 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(400A) JXD2, JXD6, JD6, HJD6, HHJD6,HHJXD6, SJD6, SHJD6a(600A) LXD6, LD6, HLD6, HHLD6,HHLXD6, SLD6, SHLD6Stationary or plug-in mounted 2.5 in.(63.5 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(400A) CJD6, SCJD6a(600A) CLD6, SCLD6Stationary or plug-in mounted 2.5 in.(63.5 mm) minimum blank cover aboveis required when this is top row of circuitbreakers.

(800A) MD6, MXD6, HMD6, SMD6,SHMD6, CMD6, SCMD6a(1200A) ND6, NXD6, HND6, SND6,SHND6, CND6, SCND6Stationary mounted only may be mounted in top position.

(1600A) PD6, PXD6, HPD6, SPD6, SHPD6,CPD6Stationary mounted only may be mounted in top position.

(2000A) RD6, RXD6, HRD6, HHRXD6Stationary mounted only may be mounted in top position.

Note:Numbers on breaker positions indicatesequence in which standard designpicks out correct bus and covers forparticular quantity of breakers or provi-sions required. Space only not avail-able.

a Smaller frame breakers may be mixed with largerframe breakers.

Circuit Breaker, Series “D” Arrangements



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DimensionsType RL Drawout CircuitBreakers

Table 7.51

RL800throughRL2000

RL800throughRL2000

RL800throughRL2000

RL800throughRL2000

RLF800throughRLF2000




Non-Fusible Fusible

A

B

C

D

Table 7.52 Type RCIII Distribution Sections for RL and Breakers

Ampere Rating

800 to 2000

RL

SB

Breaker Type W2 W3 D2 D3 D4HeightH1


Conduit AreaWidthW1

DepthD1

90.0 (2286) 25.0 (635) 58.0 (1473) 19.0 (483) 3.0 (76) 2.5 (64)13.0 (330)15.0 (381)

42.5 (1080)40.5 (1029)

Ratings for Both Type RL and SBBreakers

J Maximum thru bus rating –– 4000AJ Maximum section rating –– 4000AJ Maximum voltage rating –– 600V

Type SB Insulated Case Circuit Breakers100% Rated, Stationary and Drawout

6 High 800A Frame

Combination 800 & 2000AFrames

Combination 800 – 2000AFrames

4 High 2000A Frame


Dimensions


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Table 7.53 Panel Mounted Vacu-Break Mounting Height

Ampere Rating240V or 600V

Mounting Heightin Inches (mm)

30/30

60/60

100/100

200

200/200

400

600

7.50 (191)

10.00 (254)

15.00 (381)

Table 7.54 Type RCIII Distribution Sections for Two & Three High Vacu-Break, Two High Bolted Pressure Switches

Ampere Rating

800 to 2000Vacu-Break

Bolted Pressure

Switch Type W2 W3 D2 D3 D4HeightH1


Conduit AreaWidthW1

DepthD1

Unit SpaceH2

90.0 (2286) 38.0 (965) 48.0 (1219) or 58.0 (1473)

55.0 (1397) 32 (813) 3 (76) 2.5 (64)22 (559) or 32 (813)7.5 (191)or 17.5 (445)

23.5 (597)

38 (965)

Vacu-Break Switches Bolted Pressure Switches

100 – 600 Ampere Switches 800 & 1200 Ampere Switches


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Sentron™ SwitchboardsTie Sections

Dimensions

Table 7.55 Type RCIII Type BreakerSection with RLF LV Power Breaker

AmpereRating

800 to4000

HeightH1


WidthW1

DepthD1

90.0 (2286) 38.0 (965) 58.0 (1473)

Power Circuit Breaker Type RLF –– Draw-Out Fused

TieDevice

WD

H

AmpereRating

400 to 3200

HeightH


WidthW

DepthD

90.0 (2286) 38.0 (965) 38.0 (965)48.0 (1219)58.0 (1473)

Table 7.56 Molded Case Circuit Breakers

AmpereRating

400 to 4000

HeightH


WidthW

DepthD

90.0 (2286) 38.0 (965)

46.0 (1168)

38.0 (965)48.0 (1219)58.0 (1473)

Table 7.57 Insulated Case Circuit Breakers

5000

AmpereRating

800 to 2000

HeightH


WidthW

DepthD

38.0 (965)38.0 (965)48.0 (1219)58.0 (1473)2500 to

400090.0 (2286) 46.0 (965)

5000a 52.0 (965) 48.0 (1219)58.0 (1473)

Table 7.58 Bolted Pressure Switchesb

a Not UL Listed.b Fusible or Non Fusible.

Molded Case Circuit Breakers, Insulated Case Circuit Breakers, Bolted Pressure Switches


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Sentron™ SwitchboardsService Entrance Busway

DimensionsAvailable For Types SB3and RCIII OnlySiemens Sentron™ busway is ideal forservice entrance use with Siemens TypesSB3 and RClll switchboards. It is a low-reactance power busway available withaluminum or copper bars in 3-phase, 3-wire or 3-phase, 4-wire configuration,with or without ground bar.

Consult Section 10, beginning on page177 for complete details on SiemensSentron™ Busway.

Dimensions and Phase Sequence

The drawings below show the phasesequence and the location of the center-line of the busway opening foreach configuration, referenced to the

switchboard front and side planes.Phasing shown conforms to NEMA stan-dards and is preferred, unless alternatephasing is required by special customerterminations.

38.0 in.28.0 in.20.0 in.

(965 mm)(711 mm)(508 mm)

All widths

NCBA

SB3 Switchboard Busway Phasing Front to Rear 400 – 4000 Amperes

38.0 in.28.0 in.20.0 in.

(965 mm)(711 mm)(508 mm)

All widths

A B C N

SB3 Switchboard BuswayPhasing Left to Right400 – 4000 Amperes

58.0 in.48.0 in.

(1473 mm)(1219 mm)

19.0 in.(483 mm)

A B C N

SB3 or RCIII Switchboard BuswayPhasing Left to Right400 – 4000 Amperes

58.0 in.48.0 in.

(1473 mm)(1219 mm)

19.0 in.(483 mm)

NCBA

SB3 or RCIII Switchboard BuswayPhasing Front to Rear 400 – 4000 Amperes

NEC Section 230-95 requires ground faultprotection on all service disconnectsrated 1000 amperes and larger in 600volt class switchboards when fed by asolidly grounded wye system of morethan 150 volts to ground. Ground faultprotection is required on 480 and 600volt, 3-phase 3-wire, i.e., no neutral bus,when the serving transformer is wyeconnected. There is an exception to this rule: Groundfault protection is not required on firepumps or continuous industrial loadswhere a non-orderly shutdown wouldcause a hazard. Health care facilities, such as, hospitalsrequire additional levels of ground faultprotection. These requirements aredescribed in NEC article 517. In the 1990 NEC, new sections 215-10and 240-13 were added requiring groundfault protection on all 1000 ampere andlarger devices, breakers, and switches,applied in a system as described above,unless there is ground fault protectionupstream.Many utilities use a grounded wye sec-ondary transformer and bring a connec-tion from the grounded midpoint to theservice section ground bar. When this is the case, ground fault protection is required. For a 1000 ampere or larger 480 volt, 3-phase 3-wire service section, an inquiryshould be made to determine if the utility is using a 3-wire delta secondarytransformer. Should this be the case, no ground fault protection is required.

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Application

WARNING: The following should be performed only by qualified personnel asdefined in N.E.C. Article 100. The ground fault sensor (GFS), ground fault relay (GFR),must be installed as in drawing above.

1. Disconnect Main Power Source.2. Remove the neutral disconnect link.

Make sure the neutral is groundedonly by the main bonding jumper,which must be on the line side of the sensor.

3. Close all branch devices.4. Using a “megger” type meter,

measure the resistance of the load phase and neutral to ground. This is to ensure that no groundconnections exist in the system.Resistance readings of (1) Megohmor greater are preferred.

5. Re-install the neutral disconnect link.6. Open all branch devices.7. Connect the main power source.

8. To Test The Entire System.a. Check for control power.

(LED should be illuminated).b. Press the “push to test” switch

on the relay.c. The trip indicator should go to

the “tripped” position and thedisconnect device should operate.

d. Release the “push to test” switch and return the trip indicatorto the “reset” position.

e. Reset or “close” the disconnectdevice for normal operation of the switchboard.

9. This test meets the requirements ofthe National Electrical Code Section230-95 (C).

Ground Fault Relay

GFS #1, is the standard locationGFS #2, alternate location for GFS

An automatic throwover system providespower to a common load from two ormore sources such as utility sources andgenerator sources. In most systemsthere is a period of time from approxi-mately 1 to 5 seconds where the load iscompletely without power as the sourcesare switched. Thus it is not a “UPS”(uninterruptable power supply) systemalthough most UPS systems incorporatea transfer scheme as a part of their sys-tem. Generally, this is sufficient for mostloads other than computers which cannotstand even a momentary outage. Basically, the purpose for having an auto-matic transfer system is to providepower to critical loads by continuouslymonitoring the utility source for propervoltage and either switching to an alter-nate utility source or starting and switch-ing to an on-site generator when thevoltage fails. In more elaborate systemsother source parameters such as phasefailure, phase reversal, frequency, andreverse power might be monitored. Also,several sources might be used with cor-responding main and tie breakers-eachsource will have a main, and each pair ofmains will have a tie. The transfer system will generally feedonly the critical load to minimize theframe size of the breakers involved.However, they may be located anywherein the distribution system and anythingmay be considered “critical load”,depending on the application and userpreference. A two-device transfer scheme generallyconsists of a normal (utility) main and anemergency (generator) main with no tie.The system sends a generator enginestart signal and may also have a cool-down timer, after retransfer to utilitypower, as an option. If the generator failsthe time delay or retransfer to utilitypower is by-passed. A three-device transfer scheme generallyconsists of two main utility breakers andone tie breaker. Normally, the two mainsare closed and the tie is open. Upon fail-ure of either source that main opens andthe tie closes. Upon restoration of utilitysource the tie opens and the open maincloses. The breakers are electrically inter-locked such that any two may be closedat one time. Usually, no generators areinvolved and in more elaborate systems,momentary paralleling of sources may beused. The source sensing and logic con-trols are very similar and may include thephase failure, phase reversal, and under-voltage sensing. A time delay on transfer

to ride out momentary fluctuations, and atime delay on re-transfer to utility toinsure that the power has stabilized, isstandard. An “auto-manual” selectorswitch is provided such that the systemwill operate automatically and the manualopen-close push buttons are bypassed in“auto” and “manual”. All automatic func-tions are by-passed except the electricalinterlock and only the open - close push-buttons are functioning. This “manual” position allows for trans-fer under other than emergency condi-tions for maintenance, testing, etc. Pilotlights located near the open - close but-tons provide indications of the positionsof each breaker. Each main source powers a control trans-former and a control power selector relayswitches to whichever source is availableto insure that the system has controlpower. Each control transformer has acontrol power disconnect so if the sys-tem is placed in “manual”, all controlpower may be shut off for work on thecontrol system without disturbing thepower to the load. In the event of a short circuit or overcurrent condition such that one of the

breakers trips, the system does nottransfer to another source and ifrequested, alarm contacts may be pro-vided to energize a lockout relay and pilotlight, which must be manually resetbefore the system can be returned tonormal. Remote alarm contacts are alsoavailable if this lockout feature isrequested. By-pass contacts are provided whendraw-out breakers are used so that thesystem will function as close to normalas possible when a breaker is drawn out.Contacts for remote position indicationcan be provided for customer use. A transfer switch (such as ASCO,Russelectric, etc.) accomplishes thesame purpose as a two device transferscheme except it generally has no“open” position. These switches mustbe closed on normal or closed on emer-gency — there is no middle position. On a two device transfer scheme usingbreakers, it is possible to have bothbreakers open and thus isolate the loadfrom either source. A transfer switchcannot be used in a standard doubleended switchboard with a tie.

Sentron™ SwitchboardsAutomatic Throwover System — Types SB3 and RCIII Only

Application


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Standard Function

Electrical interlock3—Breakers 2—Breakers

3—Breakers 2—Breakers

Table 7.59 Automatic Throwover Available Functions

✓Mechanical interlock

✓

——

—

—

—

Time delay on transferTime delay on retransfer ✓

✓Voltage sensing both sourcesPhase sensing both sources ✓

✓Auto-manual switch with lightControl transformers and transfer relay ✓Bypass contacts on drawout breakersEngine start contacts

✓

Bypass of retransfer if emergency fails

✓Open-close pushbuttons and lights

Optional Function

Frequency sensingRemote alarm/lockout contactsSynchronization checkCurrent sensing ✓

✓✓✓

A and B auxilliary contactsReverse power relay

✓✓

Ground fault ✓Phase indicating lights ✓

✓

✓

✓✓

—

✓

✓

✓

✓✓

✓

✓

✓

✓

✓

✓

✓✓

✓✓✓✓✓✓✓✓

Load voltage releaseTime delay for engine cool downTest switch—loss of normalPlant exerciser

Applying SB1, SB2, and SB3Switchboards

The electrical system is bound to haveunique requirements that affect thedesign of the switchboard and theselection of the protective devices thatgo into it. However, some design aspectsare common to all systems, and can beconsidered in more general terms.

Ampacity and Future LoadRequirements

In addition to meeting the demands ofpresent loads, the switchboard should besized to accommodate reasonable futureload additions without major modifica-tions. Expansion can usually be built intothe switchboard easily. The main protec-tive device frame size or continuous cur-rent rating, and the switchboardthrough-bus can be sized on the basis ofanticipated future load demand. Trip unitsor fuses of lower ratings can be installedto meet present load conditions and sim-ply changed in the future as loadincreases, up to the maximum switch-board ratings. Most protective devices are designed tooperate continuously at 80% of their rat-ing when installed in a switchboard.Bolted pressure switches, power circuitbreakers, encased systems breakers, andsome molded case breakers, have beendesigned for operation at 100% of theircurrent rating when housed in an ade-quately ventilated enclosure. However,since most protective devices are testedin a 40°C (104°F) ambient, derating maybe necessary if the operating conditionsnormally exceed this temperature.

Selective Tripping

The switchboard and its protectivedevices must be capable of withstandingand interrupting the short circuit faultcurrent that the electrical system candeliver to the switchboard’s location inthe system. In a fully rated system, both the main and branch feeder protective devicesmust have adequate interrupting capacityfor the available fault current, and theswitchboard bus should be braced for

the same maximum fault current.Without selective tripping coordinationbetween the main and branch protectivedevices, both the main and branch devicemay trip under fault conditions. The NEC permits the application of seriesrated devices in switchboards, Seriesrated devices are those which have beenseries tested to prove that a higher ratedupstream device will protect a lowerrated downstream device.In the selective system, though, the mainand branch devices are selected so thatunder fault condition, the branch devicenormally clears the fault while the mainremains closed. Only in unusual events,such as a fault on the main switchboardbus, or a failure of the branch device tooperate, would the main device trip.Service continuity is maximized by theselective trip design.

Circuit Breaker Selectivity

Selectivity between main and branch cir-cuit breakers can be achieved up to theinstantaneous trip setting by building ashort-time delay into the main breakertrip characteristics, or properly choosingand setting instantaneous trip characteris-tics, to allow the branch breakers instan-taneous trip to clear the fault first. The short-time delay features are avail-able on solid-state molded case circuitbreakers, such as Siemens Sentron™Digital Circuit breakers, SB EncasedSystems Breakers and Type RL LowVoltage Power Circuit Breakers. Withthese breakers, a solid-state mainbreaker, and standard thermal-magneticbranch breakers can be combined toachieve an economical selective system.

Ground Fault Protection Design

While the National Electrical Code stipu-lates only that ground fault protection beprovided on the main disconnect device,the switchboard designer should con-sider service continuity when applyingground fault protection. Ground fault

protection can be achieved using groundfault relays, or integral ground fault insolid-state trip circuit breakers. Ground fault protection normally used onmain disconnect devices has a pick-uptrip from 200 to 1200 amperes, andoperating times from six to thirty cycles. For systems in which continuity of ser-vice is critical, ground fault protection isrecommended on both the main andbranch feeder devices. For hospitals, the National Electric Code, Section 517-13 requires this ground fault relayingon both the main and feeder circuits. A time coordinated scheme between themain and branch devices will provideselective coordination to maintaincontinuity of service.

Enclosure Types

Type 1 enclosures are available for indoorapplications and Type 3R for outdoor andwet locations. NEC Section 384-4 requires switchboardsto be located in dedicated rooms andspaces. Sections 384-7 and 384-8 requireplacement to reduce to a minimum theprobability of communicating fire to adja-cent combustible materials including thefloor. Section 110-16(a) defines specificworking clearances and exit doors to theswitchboard area.

Factory Testing

Prior to shipment each switchboard istested to UL 891, the dead front switch-board standard. A dielectric test is con-ducted at two times the switchboardvoltage rating plus 1000 volts. Externaldevice ground fault systems are tested at57% control voltage to ensure operationunder severe ground faults.Note: NEC Section 230-95 requires theground fault system to also be fieldtested by the installer and a permanentrecord kept of this test using the fieldtest instructions provided with theswitchboard.

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Application

1. Scope

Furnish and install, as shown on theplans, a service and distributionswitchboard as specified herein, forthe system indicated below: w 120 / 240V w 1-phase w 3-wire w 120 / 208V w 3-phase w 4-wire w 277 / 480V w _-phase w _-wire w 480Vw ____ V

Configuration

The switchboard enclosure shall be:w NEMA 1 indoor constructionw NEMA 3R outdoor constructionw Non walk-in front accessiblew Non walk-in front & rear accessibleSwitchboard shall be of the modulartype construction with the requirednumber of vertical sections boltedtogether to form one metal enclosedrigid switchboard. The sides, top andrear shall be covered with removablescrew-on code gauge steel plates.Switchboard shall include all protectivedevices and equipment as listed ondrawings with necessary interconnec-tions, instrumentation and controlwiring. All groups of control wiresleaving the switchboard shall be pro-vided with terminal blocks with suit-able numbering strips. Switchboard shall be constructed inaccordance with the latest NEMA PB-2and UL 891 standards.

2. Bus Requirements

The bus shall be w tin plated alu-minum, w silver plated copper ofsufficient size to limit the temperaturerise to 65˚C, based on UL tests. Thebus shall be braced for w 50,000,w 65,000, w 75,000, w 100,000, w 200,000 amperes symmetrical andsupported to withstand mechanicalforces exerted during short circuit con-ditions when directly connected to apower source having the indicatedavailable short circuit current. Provide afull capacity neutral where a neutral isindicated on the drawings. The through bus on the end distribu-tion section shall be extended and pre-drilled to allow the addition of futuresections with standard splice plates. Ground bus and lugs shall be fur-nished. The ground bus shall extendthe entire length of the switchboardand shall be firmly secured to eachvertical section.

3. Incoming Service

1. Underground Service:To isolate incoming undergroundservice conductors, an undergroundcable pull or auxiliary section shallbe used. This section shall be of the w nonbussed, w bussed typeand shall be sealable per local utility requirements. w screw-typemechanical lugs, w compressionlugs to terminate, w aluminum, w copper cable, shall be furnishedas detailed on the plans.

2. Overhead Service:A. Cable entry

w screw-type mechanical lugs w compression lugs to termi-nate w aluminum w coppercable shall be furnished asdetailed on the plans. Wherenecessary provide top cable pullbox which shall be sealable perlocal utility requirements.

B. Busway EntrySwitchboard to be fed bySiemens Sentron ____ amperew copper, w aluminum busway,as detailed on plans, w andother sections of this specifica-tion. The switchboard manu-facturer shall be responsible forcoordination, proper phasing andinternal bussing to the incomingbusway.

Service Section

The service section shall be designed forthe system parameters indicated in arti-cle 1.0, shall have a w ____ meteringcompartment per utility requirements, w user metering as indicated in article____, w and shall have a main protectivedevice indicated in article ____.

4. Distribution Sections (Select one of Item #B)

Bl. Switchboard Type Panel- Mounted,Front Accessible.

Switchboard shall be of Siemens SB1type, or approved equal. Individualsections shall be front accessible, notless than 20” deep, and rear of allsections shall align. Incoming line ter-mination, main device connection andall bolts used to join current-carryingparts shall be installed so as to permitservicing from the front only so thatno rear access is required. The branchdevices shall be front removable andpanel mounted with line and load sideconnections front accessible.

B2. Switchboard Type Panel- Mounted Rear Accessible

Switchboard shall be of Siemens SB2 or SB3 type, or approved equal.Individual sections shall be front andrear accessible, not less than 38"deep, and both the front and rear ofall sections shall align. The branchdevices shall be front removable andpanel mounted with line and loadside connections front accessible.The bus and main device connec-tions shall be rear accessible.

B3. Switchboard Type IndividuallyMounted, Rear Accessible(Fixed mounted devices).

Switchboard shall be of SiemensRCIII type, or approved equal. Allsections shall align front and rear. Alldisconnect devices, main and feed-ers, shall be mounted individually atthe front of the switchboard and shallbe rear accessible. The load termi-nals of each feeder device shall beextended by means of insulated busbars through the bus compartment into the rear cable compartment.

Optional

w barriers shall be provided betweenbus and cable compartment.w barriers shall be provided betweenvertical sections. w barriers shall be provided betweendevices and bus compartment.w barriers shall be provided betweenindividual devices (RC III only).

B4. Switchboard Type IndividuallyMounted Rear Accessible(Insulated Case Breaker).

Switchboard shall be of SiemensRCIII type or approved equal. All sec-tions shall be aligned front and rear.Insulated case breakers shall be indi-vidually mounted in their own com-partments. Barriers shall be providedat the sides and rear of each com-partment and a horizontal barrierbetween breakers in same verticalsection. Breaker shall be accessiblethrough hinged metal door on eachbreaker compartment.The insulated case circuit breakerassembly shall be Siemens SBEncased Systems Type, and shall beself-contained to permit quickreplacement or inspection and maintenance of breakers without de-energizing the entire switchboard.

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Application


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B4. (cont’d)

The drawout design of circuit breakershall be such that it makes it possibleto place the breakers in a fully with-drawn, disengaged, test or engagedposition. The load side of each feeder breaker shall have bus barsextending from rear of the primarydisconnect through the buscompartment in to the rear cablecompartment.

Optional:

w barriers shall be provided betweenthe bus and cable compartment andbetween vertical section.w provide traveling type breakerlifting hoist and track mounted on top of switchboard. w provide portable lifting device.

B5. Switchboard Type IndividuallyMounted Rear Accessible(Drawout Power Circuit Breaker)

Switchboard shall be of SiemensRCIII type or approved equal. All sec-tions shall be aligned front and rear.Each vertical section forming part ofswitchboard lineup shall have one ormore individual breaker or instrumentcompartments, a centralized mainbus compartment and a rear cablingcompartment. Drawout breakersshall be Siemens RL Power CircuitBreakers with Static Trip III trip unit,and shall be individually mounted intheir own compartments. Metal barri-ers shall be provided at the sides andrear of each compartment and a hori-zontal metal barrier between break-ers in the same vertical section. Thebreaker shall be accessible through ahinged metal door on each breakercompartment. The drawout mechanism of powercircuit breaker shall be such that itcan be moved from connect throughtest to disconnect position withoutopening the door, In the “connect”position, both the primary and sec-ondary disconnects are engaged. Inthe “test” position, the primary dis-connect terminals are disengaged;however, the secondary disconnectsare maintained to permit the opera-tion of the circuit breaker. In the “dis-connect” position, the primary andsecondary disconnects are engaged.

In the “test” position, the primarydisconnect terminals are disengaged:however, the secondary disconnectsare maintained to permit the opera-tion of the circuit breaker. In the“disconnect” position, the primaryand secondary disconnects are disen-gaged and separated a safe distancefrom the corresponding stationaryterminals. In the “fully withdrawn”position, both primary and secondarycontacts are disconnected and thecircuit breaker may be inspected as itcan be removed for more completeaccessibility. The load side of each feeder breakershall have bus bars extending fromthe rear of the primary disconnectthrough the bus compartment in tothe rear cable compartment.

Optional

w barriers shall be provided betweenthe bus and cable compartment andbetween vertical sections. w provide traveling type breaker lifting hoist and track mounted on top of switchboard. w provide portable lifting device.

5. Main Protective Device (Select one of Item #C)

The main protective device, to beinstalled in the main device section,shall be as indicated below:C-1 Molded case circuit breaker shall

be of the quick-make, quick-break,trip-free, (heavy duty) (extra heavyduty) (solid state) type. It shall bean ______ frame (2-pole) (3-pole)600-volt breaker with a trip cur-rent rating of:w 400A w 1200Aw 600A w 1600Aw 800A w 2000Aw 1000A w 3200Aof an interrupting capacity of notless than ______ amperes RMSsymmetrical at the system voltage.

C-2 Fusible switch of the quick-make,quick-break type. It shall be a (2-pole) (3-pole) (240V) (600V)Vacu-Break unit with a continuouscurrent rating of (400) (600) (800)(1200) amperes and with ______ampere class ______ fuses, suit-able for application on a systemwith ______ amperes symmetricalavailable fault current. The follow-ing accessory features are to beincluded:w Shunt Tripw Ground fault relayw Other ______ (list)

C-3 Bolted pressure switch of thequick-make, quick-break type. It shall be a w 2-pole, w 3-pole,w 240V, w 480V unit with acontinuous current rating of:w 800A w 2500Aw 1200A w 3000Aw 1600A w 4000Aw 2000Aand with _______ ampere Class Lfuses suitable for application on a system with ______ amperessymmetrical available faultcurrent.The following accessory featuresare to be included:w Shunt Tripw Ground fault relayw Electrical operatorw Other _______ (list)

C-4 Type RL low voltage power circuitbreaker with a drawout frame anda current rating of:w 600A w 3000Aw 800A w 4000Aw 1600A w 5000Aw 2000A

It shall be w manually w electricallyoperated power circuit breaker witha solid-state Static-Trip Ill device andan interrupting capacity of _______amperes RMS symmetrical at thesystem voltage.The following accessory featuresare to be included:w Short time delayw Integral ground fault tripw Shunt trip (M.O. C / B only)w Other _______ (list)



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Application

C-5 Type SB Encased Systems insu-lated case circuit breaker with a w stationary or w drawout frame.Frame size to be ___ ampere, 3-pole, 600V with a trip currentrating of:w 400A w 2500Aw 600A w 2500Aw 800 A w 3000Aw 1000 A w 3500Aw 1200A w 4000Aw 1600A w 5000AIt shall be a w manually, w elec-trically operated breaker with asolid state trip device, storedenergy type, trip free, an interrupt-ing capacity of not less than_______ amperes RMS symmetri-cal at the line system voltage.The following accessory featuresare to be included:w Short time delayw Integral ground fault tripw Fault trip indicatorsw Other ______ (list)

6. Branch Protective Devices (Select one of Item #D)

All molded case circuit breakers,fusible switches, insulated case circuitbreakers, bolted pressure switches,low voltage power circuit breaker, and / or motor starter units used as aprotective device in a branch circuitwill meet the requirements of theappropriate paragraph below.D-1 Molded case circuit breakers shall

be of quick-make, quick-break,trip-free w thermal magnetic type,w solid-state, with frame, trip andvoltage ratings, either 2-pole or 3-pole, as indicated on the plans.All breakers shall have an inter-rupting capacity of not less than______ amperes RMS symmetri-cal at the system voltage Allbreakers shall be removable fromthe front of the switchboard with-out disturbing adjacent units. Theswitchboard shall have space orprovisions for future units asshown on the plans.

D-2 Current limiting circuit breakersshall provide inverse time delay,instantaneous circuit protection,and also limit the let-through I2t toa value less than I2t of one-halfcycle wave of the symmetricalprospective current without anyfusible elements, Breakers shallhave an interrupting capacity ofnot less than ______ amperesRMS symmetrical at the systemvoltage.

D-3 Fusible switches shall be quick-make, quick-break units utilizingthe double-break principle of cir-cuit rupturing to minimize arcingand pitting and shall conform tothe ratings shown on the plans. Each switch shall have an individ-ual door over the front, equippedwith a voidable interlock that pre-vents the door from being openedwhen the switch is in the ONposition unless the interlock ispurposely defeated by activationof the voiding mechanism. Allswitches shall have externallyoperated handles. Switches shallbe equipped with w NEC stan-dard, w Class R rejection typefuse holders, and Class w H, w K1, w K5, w RK1, w RK5, w J, w T and w L fuses ofampere rating and type as indi-cated on the plans suitable forapplication on system with ______ampere symmetrical availablefault current.

D-4 Each bolted pressure switch shallbe the quick-make, quick-breaktype, equipped with Class L fusessuitable for application on a sys-tem with ______ amperes sym-metrical available fault current.Ampere ratings to be as shownon the plans.

D-5 Each low voltage power air circuitbreaker shall be (drawoutmounted) stored energy type, tripfree, (manually operated) (electri-cally operated) with solid-state tripdevice. Frame sizes and trip rat-ings to be as shown on the plans.All breakers to have an interrupt-ing capacity of not less than_______ amperes symmetrical atthe rated voltage.

D-6 Each insulated case circuit breakershall be (drawout) (stationary)frame. stored energy type, tripfree, (manually operated) (electri-cally operated) with solid- statetrip device. Frame sizes and tripratings to be as shown on theplans. All breakers to have aninterrupting capacity of not lessthan _______ amperes symmetri-cal at the rated voltage.


Specifications


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6. Branch Protective Devices (cont’d)

D-7 Motor Starters (SB3Switchboards only)

NEMA rated Siemens magneticstarters shall be furnished of thetype and horsepower ratings asindicated on the plans. Thermaloverload relays on starters shallbe (non-compensated bimetallictype with selector for either autoor manual reset) (ambient temper-ature compensated bimetallic typewith selector for either auto ormanual resets). Three overloadrelays will be furnished on eachstarter. The overload heater ele-ments will be sized from theactual motor nameplate data.The following accessory featureswill be furnished on each starter: w Individual control powertransformers w Pilot light(s) w Auxiliary interlocks w _______ NO _______ NC Pushbuttons, selector switchesand other pilot devices shall be fur-nished as indicated on the plans. The disconnect device shall bemounted immediately above itsassociated starter, and the unitdoors will be mechanically inter-locked to prevent access withoutde-energizing the unit. (The inter-locking means shall be voidableby qualified personnel.) Thedisconnecting devices will be: w Circuit Breakers Type ETI molded case circuitbreakers will be furnished forcombination starter. w Fusible Switches Type VB fusible switch shall befurnished for combination starters.Switches will meet the require-ments of Article D-3.

The disconnect shall be factory wired tothe starter unit. Wiring to be:w Class 1Aw Class 1B

7. Ground Fault Protection

A) General

Furnish and install in the service equip-ment and / or switchboard Ground Faultprotection and indication equipment asspecified herein and as shown on draw-ings in accordance with NEC #230-95. All parts of the systems specified shallbe UL Listed. All new Ground Fault Protection andIndication equipment shall be factoryinstalled, wired and tested by the switchboard manufacturer.

B) Ground Fault Relay

The Ground Fault Relay shall be a line-powered, self-contained device and shallbe designed to mount in the front panelof the equipment in which it is installed. The Ground Fault Relay shall be suppliedwith 120 VAC control power from a suitably rated control transformer whoseprimary is connected phase-to-phase.When control power is present, a“Control Power” indicator shall be lit on the relay panel. The Ground Fault Relay shall receive asignal from the Sensor proportional to the magnitude of the fault current. Pick-up (trip) and time delay settings shall be incrementally adjustable 100 through1200 amperes and 0.10 to 1 second,respectively in various ranges. The ground fault relay shall be providedwith an integral test panel with “push totest” and “shunt trip bypass” pushbut-tons for testing the system with or with-out tripping the protective device. w Ground fault relays shall be zoneinterlocked.

8. Metering Equipment (When Required)

Provide a multi-function, high accuracydigital power metering instrumentationmodule equipped with an LCD display.The power metering module shall providesimultaneous measurements for current,voltage, and power parameters. Powermeter shall be Siemens type w 4300 w 4700 w 4720 equipped with a com-munications port for connection to cus-tomer’s energy-management network.

9. General

The complete switchboard shall bephosphatized and finished with light gray.ASA-61 paint. Each switchboard section shall have anameplate permanently affixed to it,listing the following information:

Name of manufacturerSystem voltageAmpacity TypeManufacturer’s shop order number and date

Each section of switchboard shall bear a UL listing mark, where qualified, and a short circuit rating label. In addition, the front, side, rear and top of each switchboard section will have aDANGER label in accordance with NEMAStandard PB-2.



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ssg ch07/99-114 (page 99) - siemens · nema 3r construction. switchboard distribution sections all...

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