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UL 1066ISBN 0-7629-0179-9

Low-Voltage AC and DC Power Circuit Breakers Used inEnclosures


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May 30, 1997 UL 1066 tr1

Underwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096

UL Standard for Safety for

Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures, UL 1066

Third Edition, Dated May 30, 1997

A change is indicated by a note following the affected item. The note is preceded and followed by an asterisk.

As indicated on the title page (page 1), this UL Standard for Safety is an American National Standard. Attentionis directed to the note on the title page of this Standard outlining the procedures to be followed to retain theapproved text of this ANSI/UL Standard.

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tr2 May 30, 1997 UL 1066

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The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures,and/or other elements of the Standard having future effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective date arelocated after the Standard, and are preceded by a "SUPERSEDED REQUIREMENTS" notice.

New product submittals made prior to a specified future effective date will be judged under all of therequirements in this Standard including those requirements with a specified future effective date, unless theapplicant specifically requests that the product be judged under the current requirements. However, if theapplicant elects this option, it should be noted that compliance with all the requirements in this Standard willbe required as a condition of continued Listing, Recognition, Classification and Follow-Up Services after theeffective date, and understanding of this should be signified in writing.

Copyright 1997 Underwriters Laboratories Inc.


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MAY 30, 1997 ANSI/UL 1066-1997

1

UL 1066

Standard for

Low-Voltage AC and DC Power CircuitBreakers Used in Enclosures

First Edition January, 1985Second Edition March, 1993

Third Edition

May 30, 1997

Approval as an American National Standard (ANSI) covers the numbered paragraphson pages dated May 30, 1997. These pages should not be discarded when revisedor additional pages are issued if it is desired to retain the ANSI approved text.

An effective date included as a note immediately following certain requirements is oneestablished by Underwriters Laboratories Inc.

Approved as ANSI/UL 1066-1992, December 23, 1992 Approved as ANSI/UL 1066-1997, March 25, 1997

Revisions of this standard will be made by issuing revised or additional pages bearingtheir date of issue. A UL Standard is current only if it incorporates the most recentlyadopted revisions, all of which are itemized on the transmittal notice thataccompanies the latest set of revised requirements.

ISBN 0-7629-0179-9

COPYRIGHT 1985, 1997 UNDERWRITERS LABORATORIES INC.


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2 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 MAY 30, 1997

CONTENTS

FOREWORD

INTRODUCTION

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Units of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Undated References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

CONSTRUCTION

6 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Corrosion Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Insulating Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 CurrentCarrying Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

10 Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911 Operating Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 913 Trip Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914 Interlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 915 Control Circuit Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916 Control Circuit Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

PERFORMANCE

17 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018 Interlock Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1119 Dielectric Voltage-Withstand Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1120 Grounding Resistance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1221 Trip Device Calibration Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

RATINGS

22 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

MARKINGS

23 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

SUPPLEMENT SA LOW-VOLTAGE AC POWER CIRCUIT BREAKERS (NAVAL USE)

INTRODUCTION

SA1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA1


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MAY 30, 1997 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 3

PERFORMANCE

SA2 Endurance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA1SA3 Continuous Current Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA1SA4 Calibration Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA1SA5 Inclined Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA2

SA6 Vibration Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA2SA7 Calibration Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA3

MARKINGS

SA8 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SA3

SUPPLEMENT SB CLASSIFIED TRIP DEVICES FOR USE WITH LOW-VOLTAGE AC POWERCIRCUIT BREAKERS

INTRODUCTION

SB1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB1

CONSTRUCTION

SB2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB1

PERFORMANCE

SB3 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB1

MARKINGS

SB4 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB1

MANUFACTURING AND PRODUCTION-LINE TESTS

SB5 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB1

APPENDIX A

Standards for Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1


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FOREWORD

A. This Standard contains basic requirements for products covered by Underwriters

Laboratories Inc. (UL) under its Follow-Up Service for this category within thelimitations given below and in the Scope section of this Standard. These requirementsare based upon sound engineering principles, research, records of tests and fieldexperience, and an appreciation of the problems of manufacture, installation, and usederived from consultation with and information obtained from manufacturers, users,inspection authorities, and others having specialized experience. They are subject torevision as further experience and investigation may show is necessary or desirable.

B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturer's product.

C. A product which complies with the text of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have

other features which impair the level of safety contemplated by these requirements.

D. A product employing materials or having forms of construction differing from thosedetailed in the requirements of this Standard may be examined and tested accordingto the intent of the requirements and, if found to be substantially equivalent, may be

judged to comply with the Standard.

E. UL, in performing its functions in accordance with its objectives, does not assumeor undertake to discharge any responsibility of the manufacturer or any other party.The opinions and findings of UL represent its professional judgment given with dueconsideration to the necessary limitations of practical operation and state of the artat the time the Standard is processed. UL shall not be responsible to anyone for theuse of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use, interpretation of or reliance upon this Standard.

F. Many tests required by the Standards of UL are inherently hazardous andadequate safeguards for personnel and property shall be employed in conductingsuch tests.


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INTRODUCTION

1 Scope

1.1 These requirements cover low-voltage ac power circuit breakers as follows:

a) Stationary-mounted or drawout-mounted types,

b) 2-pole and 3-pole constructions,

c) Manually operated or power operated, and

d) With or without electromechanical or solid-state type trip device.

1.2 These requirements apply to drawout-mounted type low-voltage ac integrally fused power circuit breakers,consisting of low-voltage ac power circuit breakers with integral current limiters or fuses.

1.3 These requirements apply to low-voltage ac fuse draw-outs consisting of current limiters or fuses in adrawout assembly intended to be connected in series with a low-voltage ac power circuit breaker to form a

fused circuit breaker.

1.4 These requirements apply to general purpose type low-voltage dc power circuit breakers.

1.5 These requirements cover equipment intended for use in ordinary locations in accordance with the NationalElectrical Code, ANSI/NFPA 70.

1.6 These requirements are intended to supplement and be used in conjunction with the:

a) Standard for Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI/IEEE C37.13-1990,

b) Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures, ANSI/IEEE C37.14-1993,

c) Standard for Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear, ANSI/IEEE C37.20.1-1993,

d) Test Procedures for Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI C37.50-1989 (R1995), and

e) Conformance Testing of Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies, ANSI C37.51-1989 (R1995).

1.7 These requirements cover equipment rated 600 V or less nominal, 635 V maximum ac and 300 Vmaximum dc.

1.8 This Standard does not apply to molded-case circuit breakers.

1.9 These circuit breakers are intended for installation in circuit breaker enclosures, switchboards (switchgear),panelboards, and the like. Drawout-mounted devices are intended for use with specific adapters or receivingequipment. The acceptability of the combination of a circuit breaker with respect to any overall enclosure willbe determined when the complete product is considered.


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1.10 A product that contains features, characteristics, components, materials, or systems new or different fromthose covered by the requirements in this Standard, and that involves a risk of fire, electric shock, or injury topersons shall be evaluated using the appropriate additional component and end-product requirements asdetermined necessary to maintain the acceptable level of safety as originally anticipated by the intent of thisStandard. A product whose features, characteristics, components, materials, or systems conflict with specificrequirements or provisions of this Standard cannot be judged to comply with this Standard. Where considered

appropriate, revision of requirements shall be proposed and adopted in conformance with the methodsemployed for development, revision, and implementation of this Standard.

2 General

2.1 The requirements in this Standard shall be applied in addition to those contained in the followingdocuments:

a) The Standard for Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSI/IEEE C37.13-1990,

b) The Standard for Low-Voltage DC Power Circuit Breakers Used In Enclosures, ANSI/IEEE C37.14-1993,

c) The Test Procedures for Low-Voltage AC Power Circuit Breakers Used In Enclosures, ANSIC37.50-1989 (1995), and

d) Switchgear Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies Conformance Test Procedures, ANSI C37.51-1989 (R1995).

2.2 The term circuit breaker as used in this Standard means low-voltage power circuit breaker, both the ac anddc types. When a requirement applies specifically to either an ac or dc type, but not both, the term ac circuitbreaker or dc circuit breaker is used. The term fused circuit breaker is used for an integrally fused power circuitbreaker or the combination of a fuse drawout and a circuit breaker.

2.3 Reference in this Standard is made by designation only to the following American National Standards.

Designation Title

ANSI/IEEE C37.13-1990 Standard for Low-Voltage AC Power Circuit Breakers Used in Enclosures

ANSI/IEEE C37.14-1993 Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures

ANSI C37.16-1988 (R1995) Preferred Ratings, Related Requirements, and Application Recommendations for Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors

ANSI C37.17-1979 (R1988) Trip Devices for AC and General Purpose DC Low-Voltage Power Circuit Breakers

ANSI/IEEE C37.20.1-1993 Metal-Enclosed Low-Voltage Power Circuit-Breaker Switchgear

ANSI C37.50-1989 (R1995) Test Procedures for Low-Voltage AC Power Circuit Breakers Used in Enclosures

ANSI C37.51-1989 (R1995) Switchgear Metal-Enclosed Low-Voltage AC Power Circuit Breaker Switchgear Assemblies Conformance Test Procedures

ANSI/IEEE C37.100-1992 Definitions for Power Switchgear


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2.4 The terms used in this Standard are as indicated in ANSI/IEEE C37.100-1992.

2.5 ADAPTER Inasmuch as an adapter is designed to interface between a drawout-mounted device and thereceiving devices such as individual enclosures, deadfront switchboards, and panelboards an adapter isto be investigated in conjunction with the intended drawout-mounted device.

3 Components

3.1 Except as indicated in 3.2, a component of a product covered by this Standard shall comply with therequirements for that component. See Appendix A for a list of standards covering components generally usedin the products covered by this Standard.

3.2 A component need not comply with a specific requirement that:

a) Involves a feature or characteristic not needed in the application of the component in the productcovered by this Standard, or

b) Is superseded by a requirement in this Standard.

3.3 A component shall be used in accordance with its recognized rating established for the intended conditionsof use.

3.4 Specific components are recognized as being incomplete in construction features or restricted inperformance capabilities. Such components are intended for use only under limited conditions, such as certaintemperatures not exceeding specified limits and shall be restricted to use only under those specific conditionsfor which they have been recognized.

4 Units of Measurement

4.1 If a value for measurement is followed by a value in other units in parentheses, the second value may beonly approximate. The first stated value is the requirement.

5 Undated References

*Section 5 added May 30, 1997*

5.1 Any undated reference to a code or standard appearing in the requirements of this Standard shall beinterpreted as referring to the latest edition of that code or standard.

CONSTRUCTION

6 General

6.1 These circuit breakers shall comply with ANSI/IEEE C37.13-1990 or ANSI/IEEE C37.14-1993 as

appropriate, and with the requirements in this Standard.6.2 A fuse draw-out shall include an open-fuse trip device that will cause tripping of the series circuit breaker,when one or more of the fuses or current limiters opens.

6.3 A fused circuit breaker shall include an open-fuse trip device that will cause tripping of the circuit breaker,when one or more of the fuses or current limiters opens.


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6.4 A circuit breaker shall be so formed and assembled that it will have the strength and rigidity necessary toresist the ordinary abuses to which it may be subjected, including the tests specified in these requirements,without increasing the risk of fire or electric shock due to partial or total collapse with a resulting loosening or displacement of parts or other serious defects.

7 Corrosion Protection

7.1 Iron and steel parts shall be protected against corrosion by enameling, galvanizing, plating or an equivalentmeans.

Exception: Thermal elements, magnet pole faces, and hardened and polished parts, such as latching surfaceswhere such protection is impractical, need not be protected.

8 Insulating Materials

8.1 An insulating material is to be investigated to determine its acceptability for the application withconsideration being given to its:

a) Mechanical strength,

b) Dielectric properties,

c) Insulation resistance,

d) Tracking resistance,

e) Heat-resistant qualities,

f) The degree to which it is enclosed or protected, and

g) Any other features having a bearing on the risk of fire and electric shock involved.

All of these factors are to be considered with respect to thermal aging. A polymeric material shall beadditionally evaluated in accordance with the Standard for Polymeric Materials Use in Electrical EquipmentEvaluations, UL 746C.

9 Current-Carrying Parts

9.1 A current-carrying part shall be of silver, a silver alloy, copper, a copper alloy, or other metal that has beenshown by tests to be acceptable for the application.

9.2 Uninsulated live metal parts shall be so secured to the mounting surfaces that they will be kept fromturning.

9.3 Friction between surfaces is not acceptable as a means to keep uninsulated live metal parts from turning.Parts shall be kept from turning by the use of two screws or rivets, by shoulders or mortises, by a dowel pin,lug, or offset, by a connecting strap or other clip fitted into an adjacent part, or by an equivalent method.


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10 Terminations

10.1 DRAWOUT-MOUNTED DEVICES Disconnecting means shall be provided for mating with intendedreceiving equipment or adapters.

10.2 STATIONARY-MOUNTED DEVICES Terminals shall be provided for mounting pressure wire

connectors or for connecting to a bus system.

11 Operating Mechanism

11.1 When a circuit breaker is equipped with an operating handle that is made of a conductive material, thehandle shall be in electrical connection with the frame or shall be so constructed that when it is mounted in theintended manner, it will be grounded.

12 Grounding

12.1 All dead metal parts that are exposed to personnel when the device is energized shall be grounded.

12.2 The configuration of the grounding means between a metal part of a drawout-mounted device intended

to be grounded and any permanently grounded part shall be such that grounding continuity is established 1/8inch (3.2 mm) before either primary or secondary disconnects of the drawout unit are energized; and alsomaintained until both primary and secondary disconnects have been deenergized by at least 1/8 inch (3.2 mm).See Grounding Resistance Tests, Section 20.

13 Trip Devices

13.1 A trip device shall be of the dual, selective, or triple-selective type as defined in ANSI C37.17-1979(R1988).

14 Interlocks

14.1 Mechanical interlocks shall be provided for draw-out type devices to provide the functions outlined in6.11.1 of ANSI/IEEE C37.20.1-1993. The interlock mechanism shall be on the draw-out device, the receivingadapter, or a combination of the two.

15 Control Circuit Wiring

15.1 The internal wiring of control circuits shall consist of general use wire or appliance wiring material (AWM)acceptable for the particular application, when considered with respect to the temperature and voltage andconditions of service to which the wiring is likely to be subjected.

15.2 Wireways shall be smooth and entirely free from sharp edges, burrs, fins, moving parts and the like, whichmay cause abrasion of the insulation on conductors.

15.3 A splice, where used, shall be provided with insulation equivalent to that of the wires involved.


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16 Control Circuit Field Wiring Connections

16.1 DRAWOUT-MOUNTED DEVICES Secondary disconnects shall be provided such that control circuitsare not connected when the device is in the "disconnected" position. Secondary disconnects are to beconnected in the "connected" and "test" positions. The acceptability of the secondary disconnects shall bedetermined by tests as referred to or described in this Standard.

16.2 STATIONARY-MOUNTED DEVICES Terminals or bus connections shall be provided for the connectionof wiring to stationary-mounted devices, including an accessory.

16.3 For terminal connections, pressure terminal connectors shall be used, except that for a No. 10 AWG (5.3mm ) or smaller wire, the parts to which wiring connections are made may consist of clamps or wire-binding2

screws with terminal plates having upturned lugs or the equivalent to hold the wires in position.

16.4 A wire-binding screw to which field-wiring connections are made shall not be smaller than No. 8, exceptthat a No. 6 or larger screw may be used for a terminal to which No. 14 AWG (2.1 mm ) or smaller wire is2

intended to be connected.

16.5 A terminal plate tapped for a wire-binding screw shall be of metal not less than 0.030 inch (0.76 mm) thick

for a No. 14 AWG (2.1 mm ) or smaller wire, and not less than 0.050 inch (1.27 mm) thick for a wire larger than2

No. 14 AWG. In either case, there shall not be fewer than two full threads in the metal.

Exception: A terminal plate formed from stock having the minimum thickness, may have the metal extruded at the tapped hole for the binding screw to provide two full threads. Two full threads are not required if fewer threads result in a sufficiently secure connection in which the threads will not strip upon the application of a 20 lb-in (2.3 Nm) tightening torque.

16.6 A wire-binding screw shall thread into metal.

PERFORMANCE

17 General

17.1 The performance requirements for products covered by this Standard, other than those presented in thisStandard, are covered in the American National Standards as indicated in Table 17.1.

Table 17.1Product ANSI standards

Product Standard designation

DC circuit breakers ANSI/IEEE C37.14-1993

AC circuit breakers ANSI/IEEE C37.13-1990 and ANSI C37.50-1989 (R1995)

Fuse draw-outs See 17.2

Trip devices ANSI C37.50-1989 (R1995) and ANSI C37.17-1979 (R1988)

Accessory devices ANSI C37.50-1989 (R1995)a

Test requirements for accessory devices are contained in Section 4 of ANSI C37.50-1989 (R1995).a


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17.2 A fuse draw-out is to be tested in combination with the specific circuit breaker with which it is intended tobe used. Test Sequence V from ANSI C37.50-1989 (R1995) is to be performed with the two elements housedin separate enclosures (adaptors). Fuses are to be selected in accordance with 17.3 17.5.

17.3 Fused circuit breakers employing current limiters shall be tested with the specific type current limiter it isintended to employ, or with fuses selected in accordance with 17.4 and 17.5. The specific type shall be

constructed so that a standard fuse cannot replace it without deliberately defeating a non-interchangeabilityfeature.

17.4 Fused circuit breakers employing standard fuses shall be tested with fuses having characteristicsrepresenting the peak let-through current (I ) and maximum I t associated with the maximum rated fuses thep

2

device is constructed to accept. Each of these fuses is to be of such characteristics that, when tested on asingle phase circuit, it will permit a peak let-through current (I ) and a maximum I t of not less than thep

2

corresponding value specified in the requirements for the current and voltage rating of the class fuse intendedfor use in the device being tested. To obtain the required values of these characteristics, it may be necessaryto employ a fuse having a current rating larger than that of the fuse that the device accommodates and of adifferent class. If the fuse cannot be physically accommodated, it is to be mounted externally and dummy fusesmounted inside in the fuse clip assemblies.

17.5 Fuses, referred to in 17.4, used for tests are to be selected from a lot from which one sample has beenselected and calibrated to determine that its I t and I characteristics comply with the prescribed values called2 pfor in 17.4.

17.6 The intermediate short-circuit current rating test [ANSI C37.50-1989 (R1995) Table 3, Test 12 2 timesthe 600-V short-circuit current rating] for a fuse draw-out with a continuous current rating of 4000 A shall be at130 kA, plus 20 percent, minus 10 percent.

17.7 The temperature rise limit for fuse draw-out terminal connections when silver plated and intended to beenclosed, is 65 E C (117 E F).

17.8 Both single-phase and 3-phase tests are to be conducted to determine the acceptability of the single-phase and 3-phase short-circuit or short-time current ratings.

17.9 Proper operation of functional components is to be determined as part of the sequential testing inaccordance with ANSI/IEEE C37.14-1993 or ANSI C37.50-1989 (R1995), or both.

17.10 It is not necessary to test the accessory devices as part of the sequential testing.

18 Interlock Verification Tests

18.1 The interlock mechanism for draw-out devices shall be subjected to a mechanical performance test inaccordance with Section 4.5 of ANSI C37.51-1989 (R1995).

19 Dielectric Voltage-Withstand Tests

19.1 With a draw-out device in the "test" and "disconnected" position, and any other definite position other thanthe "connected" position, it shall withstand for one minute without breakdown the application of a 60 Hzsinusoidal potential of 1000 V plus twice the voltage rating of the primary circuit between the primary circuit of the circuit breaker and the primary terminals of the adapter.


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20 Grounding Resistance Tests

20.1 The grounding continuity shall be such that the resistance does not exceed 0.06 ohm when tested asspecified in 20.2:

a) Between the handle of conductive material, as described in 11.1, and the frame or enclosure, and

b) Between any metal part of a drawout-mounted device intended to be grounded, as described in12.2, and the member of the stationary part that is intended to provide the grounding path.

20.2 Compliance with 20.1 is to be determined by measuring the voltage when a current of 30 A is passedbetween the parts in question. The current is to be derived from a 48 62 Hz or dc source, having an opencircuit voltage preferably not exceeding 30 V. A drawout-mounted device is to be in any position providing lessthan 1/8 inch (3.2 mm) clearance between the disconnect (primary and secondary) and the associated live partof the stationary member. The voltage drop is to be measured between the two parts within 6 inches(150 mm) of the stationary member to the farthest point on the drawout unit and the resistance is to becomputed therefrom.

21 Trip Device Calibration Tests

21.1 The calibration tests shall be performed as part of the sequence testing of the circuit breaker and the testresults shall comply with both ANSI C37.17-1979 (R1988) and the manufacturer's published curves.

Exception: If the test results comply with ANSI C37.17-1979 (R1988) but do not meet the manufacturer's published curves, additional calibration tests may be performed where at least 6 points on the manufacturer'scurve are checked. The results of all points shall comply with ANSI C37.17-1979 (R1988) requirements.

RATINGS

22 General

22.1 Much of the information appearing in this section is redundant with that appearing in the ANSI referencedstandards and is presented for convenience.

22.2 Each AC device shall have one or more maximum voltage ratings of 635, 508, or 254 V for applicationon systems having nominal voltage ratings of 600, 480, 240 V ac. AC integrally fused power circuit breakersand ac power circuit breakers intended to be connected in series with fuse drawouts shall be rated 600 Vmaximum.

22.3 General purpose type low-voltage dc power circuit breakers shall be rated 300 V maximum.

22.4 The 3-phase short-circuit or short-time current rms symmetrical ratings shall be one of the following:14,000, 18,000, 22,000, 25,000, 30,000, 35,000, 42,000, 50,000, 65,000, 85,000, 100,000, 130,000, 150,000,or 200,000 A. The single phase rating shall be 87 percent of the 3-phase ratings.

22.5 The short-circuit current ratings for dc circuit breakers shall be as indicated in Table 8 of ANSI C37.16-1988 (R1995).


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MARKINGS

23 General

23.1 An ac circuit breaker shall be marked in accordance with Section 5 of ANSI/IEEE C37.13-1990.

23.2 A dc circuit breaker shall be marked in accordance with Section 6 of ANSI/IEEE C37.14-1993.

23.3 A drawout-mounted device shall be marked with at least one of the following:

a) To show the designation of an intended adapter,

b) To show the minimum enclosure size, insulation requirements and ventilation requirements, or

c) To refer to a drawing showing the minimum requirements, and ventilation requirements.

23.4 Voltage and current requirements for each control circuit or auxiliary circuit shall be marked on the circuitbreaker or provided with other information shipped with the circuit breaker.

23.5 Circuit breakers with ground-fault elements that have settings greater than 1200 A shall be marked "NotFor Use As Service Equipment" or the equivalent.

23.6 A fuse draw-out shall be marked to indicate the circuit breaker, or circuit breakers, with which it is intendedto be used.

23.7 A circuit breaker that has been tested in combination with a fuse draw-out shall be marked to indicate thefuse draw-out with which it is intended to be used and that the increased short-circuit current rating associatedwith the fuse, or current limiter, applies only when the circuit breaker is connected in series with the fuse draw-out.

23.8 A circuit breaker without an integral direct acting trip device shall be marked to indicate that over-currentprotection is not provided or to indicate the catalog number or type of protective relay that is to be used toachieve over-current protection.


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MAY 30, 1997 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 SA1

SUPPLEMENT SA LOW-VOLTAGE AC POWER CIRCUIT BREAKERS (NAVAL USE)

INTRODUCTION

SA1 Scope

SA1.1 These requirements cover low-voltage ac power circuit breakers intended for use aboard non-combatant and auxiliary naval ships. A naval circuit breaker shall comply with the applicable requirements of the preceding Sections of this Standard and of this Supplement.

PERFORMANCE

SA2 Endurance Test

SA2.1 The test is to be performed in accordance with Section 3.8 of ANSI C37.50-1989 (R1995).

Exception No. 1: The number of operations shall be according to Table SA2.1.

Exception No. 2: Servicing, as described in the note to Table 4 of ANSI C37.16-1988 (R1995), is not permitted.

Table SA2.1Endurance requirements for low-voltage AC power circuit breakers (Navy applications)

Circuit breaker frame size,amperes Electrical endurance Mechanical endurance Total

Number of operating cyclesa

1600/2000 1000 3000 4000

3000 500 1000 1500

4000 500 1000 1500 All operating cycle requirements are without servicing

a

SA3 Continuous Current Test

SA3.1 The test is to be conducted in accordance with Section 3.6 of ANSI C37.50-1989 (R1995), and Table2 of ANSI C37.13-1990.

Exception: The temperature rise limit for insulating material is to be based on an ambient temperature of 50 E C (122 E F).

SA4 Calibration Test

SA4.1 Circuit breakers with trip devices that are sensitive to ambient temperatures are to be calibrated or ambient compensated for use in an ambient of 50 E C (122 E F).


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SA2 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 MAY 30, 1997

SA5 Inclined Operations

SA5.1 Calibration Check Tests as described in Section 3.4 of ANSI C37.50-1989 (R1995) are to be performedwith the test device inclined 30 degrees from the horizontal plane. Results shall not exceed 5 percent of thelimits from the manufacturer's operating curves or the limits in ANSI C37.17-1979 (R1988).

SA6 Vibration Test

SA6.1 General

SA6.1.1 During and after the vibration tests specified in SA6.2 and SA6.3, a naval circuit breaker shall not openthe contacts when they are in the closed position.

SA6.1.2 After the vibration tests specified in SA6.2 and SA6.3, a naval circuit breaker:

a) Shall continue to operate as intended without adjustments or repairs,

b) Shall meet the limits of the specified time bands for calibration,

c) Fuse units shall not open the circuit, change protective characteristics, lose filler material, or showsigns of deformation, and

d) Shall have a minimum insulation resistance of 10 megohms.

SA6.1.3 To determine whether the contacts open during the vibration tests, an oscillograph is to be connectedacross the circuit breaker contacts.

SA6.1.4 For these tests, peak-to-peak amplitude is defined as the maximum displacement of sinusoidal motion(total table displacement).

SA6.2 Resonance frequency test

SA6.2.1 A circuit breaker is to be vibrated at a peak-to-peak amplitude of 0.020 0.002 inch (0.51 0.05 mm)in three rectilinear axes, horizontal, vertical, and lateral at frequencies starting at 4 Hz (or the lowest attainablefrequency but not greater than 10 Hz) to 33 Hz. A change in frequency is to be made in discrete intervals of 1 Hz and maintained at each frequency for 15 seconds. The frequency and orientation at which resonancesoccur is to be noted.

Table SA6.1Displacement of vibration

Frequency range, Hz Inches (mm)

Table amplitude

4 to 15 0.060 0.006 (1.52 0.15)

16 to 25 0.040 0.004 (1.02 0.10)

26 to 33 0.020 0.002 (0.51 0.05)


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MAY 30, 1997 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 SA3

SA6.2.2 If a resonance has been determined in accordance with SA6.2.1, the circuit breaker is to be subjectedto that resonant frequency, displacement, and orientation in accordance with SA6.2.1 for 2 hours. If resonanceis not observed in accordance with SA6.2.1 the test is to be conducted at 33 Hz at an amplitude of 0.020 0.002inch (0.51 0.05 mm) for 2 hours in any plane.

SA6.3 Variable frequency test

SA6.3.1 A variable frequency test is to be conducted separately in each of the three rectilinear axes, horizontal,vertical, and lateral. All tests in one direction are to be completed before proceeding to the tests in another direction. The circuit breaker is to be energized as intended in actual service during the test. The test is to beconducted at an ambient temperature of 25 E C (77 E F).

SA6.3.2 A circuit breaker is to be mounted in a horizontal plane and subjected to the vibration displacementranges and amplitude specified in Table SA6.1. The vibration equipment is to be varied in discrete frequencyintervals of 1 Hz and is to be maintained at each interval for 5 minutes.

SA6.3.3 A circuit breaker is to be mounted in a one-high cubicle or other suitable enclosure, which is in turnto be secured to the test fixtures secured to the vibration table. Unsupported panel surfaces are to bemaintained to reduce the likelihood of resonance of the panels within the test frequency range. Each circuit

breaker is to be wired with stranded copper conductors of the appropriate size for the rating properly torqued.The wires are to be connected to a power supply and instrumentation located off the platform of the vibration-test machine. The wiring is to be installed to simulate a normal installation and is to be secured within 7 inches(179 mm) of the terminals. As installed, the wiring is not to be resonant.

SA7 Calibration Test

SA7.1 A calibration test is to be made as described in 3.4.1.1 of ANSI C37.50-1989 (R1995). The test is to beconducted at 50 E C (122 E F) if the trip device is sensitive to ambient temperatures.

MARKINGS

SA8 General

SA8.1 A low-voltage ac power circuit breaker intended for naval use aboard non-combatant and auxiliary navalships shall be marked "Naval", or the equivalent, where visible after installation with the circuit breaker enclosure door in the open position.


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SA4 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 MAY 30, 1997



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MAY 30, 1997 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 SB1

SUPPLEMENT SB CLASSIFIED TRIP DEVICES FOR USE WITH LOW-VOLTAGE AC POWER CIRCUITBREAKERS

INTRODUCTION

SB1 Scope

SB1.1 These requirements cover classified trip devices intended for use as replacements for trip devicesprovided with circuit breakers.

SB1.2 These requirements are intended for use in conjunction with the Requirements for Conversion of Power Switchgear Equipment, IEEE C37.59-1991.

CONSTRUCTION

SB2 General

SB2.1 A classified trip device shall comply with the requirements in this Standard and also with the applicablerequirements of ANSI C37.17-1979 (R1988).

PERFORMANCE

SB3 General

SB3.1 A classified trip device shall comply with the requirements of ANSI C37.17-1979 (R1988) and ANSIC37.50-1989 (R1995) when installed on a circuit breaker.

SB3.2 Tests shall be performed to demonstrate that the trip device operates to meet both the requirementsof ANSI C37.17-1979 (R1988) and the manufacturers operating curve.

SB3.3 Tests shall be performed as described in Section 3.9.4.5 of ANSI C37.50-1989 (R1995) to demonstratethat the trip device causes the host circuit breaker to trip when short circuit currents are present and continuesto function following these tests.

MARKINGS

SB4 General

SB4.1 Each trip device shall be marked with the manufacturer's name, address, type or catalog designationand ratings as appropriate.

MANUFACTURING AND PRODUCTION-LINE TESTS

SB5 General

SB5.1 Each trip device shall be tested in accordance with Section 6.2.2 of ANSI C37.50-1989 (R1995).


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SB2 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 MAY 30, 1997



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MAY 30, 1997 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 A1

APPENDIX A

Standards for Components

Standards under which components of the products covered by this standard are evaluated include thefollowing:

Title of Standard UL Standard Designation

Marking and Labeling Systems UL 969Plastic Materials for Parts in Devices and Appliances, Tests for Flammability of UL 94Polymeric Materials Fabricated Parts UL 746DPolymeric Materials Long Term Property Evaluations UL 746BPolymeric Materials Short Term Property Evaluations UL 746APolymeric Materials Use in Electrical Equipment Evaluations UL 746CPrinted-Wiring Boards UL 796Switches, Special Use UL 1054Systems of Insulating Materials General UL 1446Tape, Polyvinyl Chloride, Polyethylene, and Rubber-Insulating UL 510

Terminal Blocks UL 1059Tubing, Extruded Insulating UL 224Wire Connectors and Soldering Lugs for Use With Copper Conductors UL 486AWire Connectors for Use With Aluminum Conductors UL 486BWires and Cables, Rubber-Insulated UL 44Wire Connectors, Splicing UL 486CWires and Cables, Thermoplastic-Insulated UL 83Wiring Terminals, Equipment, for Use With Aluminum and/or Copper Conductors UL 486E


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A2 LOW-VOLTAGE POWER CIRCUIT BREAKERS USED IN ENCLOSURES UL 1066 MAY 30, 1997


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