ngrm-enc manual enclosed neutral-grounding …/media/protection-relays/... · 2015-03-25 · page 2...
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3714 Kinnear Place Saskatoon, SK Canada S7P 0A6 Ph: (306) 373-5505 Fx: (306) 374-2245 www.littelfuse.com/relayscontrols
NGRM-ENC MANUAL
ENCLOSED NEUTRAL-GROUNDING-RESISTOR MONITOR
Revision 0-B-030515
NGRM-ENC
CONTROL POWER
GROUNDFAULT
RESISTORFAULT
RESET
USB
PHASE A
PHASE B
PHASEC
ON
PULSEENABLE
LEAKAGE CURRENT
OFF
NGRM-ENC
ON
PHASEA
PHASE B
PHASEC
0.1
0.5 0.7 1.02.03.0
5.010.0
4
108
2040
606 80
100MEM2
1.01.2
1.41.6
1.8 2.0 2.22.42.6
2.83.0
SE-330NEUTRAL-GROUNDING-RESISTOR MONITOR
0.2
0.30.4
CAL
RESET
GF TRIP TIME (s) PULSE PERIOD (s)
GF TRIP LEVEL(% CT RATING)
LITTELFUSE STARTCO
TRIP
GROUNDFAULT
POWER
RELAY K1
DIAGNOSTIC
CALIBRATED
TRIP
RESISTORFAULT
60
170130
200340
800100 1200
1700200020
V TRIP LEVELN( )S5 20 K
V x 1N 100 KV x 5N
Ω Ω
PULSEENABLE
LEAKAGE CURRENT
OFF
Copyright © 2015 by Littelfuse Startco
All rights reserved. Document Number: PM-1230-EN Printed in Canada.
Page i NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
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Page ii NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
TABLE OF CONTENTS SECTION PAGE
1 General ................................................................. 1 1.1 SE-325 Models ..................................................... 1 1.2 SE-330 Models ..................................................... 1 2 Operation ............................................................. 1 2.1 Indication, Metering, and Reset ............................ 1 2.2 Configuration and Settings ................................... 1 3 Installation ........................................................... 2 3.1 Type 4X Enclosure ............................................... 2 3.2 Connections to the Neutral-Grounding-Resistor and Current Transformer ....................................... 2 3.2.1 SE-325 Models .......................................... 2 3.2.2 SE-330 Models .......................................... 2 3.3 Supply Voltage Connection .................................. 2 3.3.1 Supply by Field Connection ...................... 2 3.3.2 Control Power Transformer (CPT) Models .................................................................. 2 3.4 Phase-Voltage Indication ...................................... 2 3.5 Relay-Output Connections .................................... 2 3.6 Network-Communications Connections ............... 2 3.7 Dielectric-Strength Testing ................................... 2 4 Technical Specifications ................................... 15 5 Ordering Information ....................................... 16 6 Warranty ........................................................... 16 Appendix A NGRM-ENC Revision History .............. 17
LIST OF FIGURES
FIGURE PAGE 1 NGRM-ENC Outline and Mounting Details ......... 3 2 SE-325 Typical Wiring Diagram........................... 4 3 SE-330 Typical Wiring Diagram........................... 5 4 SE-325 Model (NGRM-ENC-100-01) Interior/Exterior Details .......................................... 6 5 SE-325 Model (NGRM-ENC-100-01) Interior Details ........................................................ 7 6 SE-325 Model (NGRM-ENC-XX0-XX) Wiring Label .......................................................... 8 7 SE-330 Surface-Mount Model (NGRM-ENC-XX0-21) Interior/Exterior Details .... 9 8 SE-330 Surface-Mount Model (NGRM-ENC-XX0-X1) Interior Details ............... 10 9 SE-330 Surface-Mount Model (NGRM-ENC-XX0-XX) Wiring Label................. 11 10 SE-330 Panel-Mount Model (NGRM-ENC-XX1-21) Interior/Exterior Details .. 12 11 SE-330 Panel-Mount Model (NGRM-ENC-XX1-X1) Interior Details ............... 13 12 SE-330 Panel-Mount Model (NGRM-ENC-XX1-XX) Wiring Label................. 14
DISCLAIMER Specifications are subject to change without notice. Littelfuse Startco is not liable for contingent or consequential damages, or for expenses sustained as a result of incorrect application, incorrect adjustment, or a malfunction.
Page iii NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
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Page 1 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
1. GENERAL
The NGRM-ENC Enclosed Neutral-Grounding-Resistor (NGR) Monitor series is a Type 4X enclosure housing a Littelfuse Startco SE-325 or SE-330 Neutral-Grounding-Resistor Monitor and optional accessories that include a 480/600-V control power transformer (CPT), faulted-phase indication (FPI; implemented with an EL3100 Ground-Fault & Phase-Voltage Indicator), earth-leakage panel meter, pulse-enable control, and mounting options. Appropriate fusing is included and field wiring is to terminal blocks. This manual supplements the relevant NGR-monitor and EL3100 manuals. 1.1 SE-325 MODELS
NGRM-ENC models with an SE-325 NGR Monitor include a surface-mounted NGR monitor, panel-mounted indication and reset and have a Type 4X rating. Options include a CPT and FPI. See Figs. 4 and 5. 1.2 SE-330 MODELS
NGRM-ENC models with an SE-330 NGR Monitor include a panel- or surface-mounted NGR monitor which can be optionally equipped with a network-communications interface. Panel-mounted models include an SE-IP65CVR-G Hinged Transparent Cover and have an IP65 rating. Surface-mounted models include panel-mounted indication and reset, USB connector, and have a Type 4X rating. Both mounting styles can optionally be equipped with a CPT, FPI, earth-leakage panel meter, and pulse-enable switch. See Figs. 7 and 10. 2. OPERATION
Refer to the SE-325, SE-330, and EL3100 manuals included with the NGRM-ENC or at www.littelfuse.com/ relayscontrols, as required. NOTE: For models equipped with an SE-330 NGR Monitor and an optional pulse-enable switch, select Pulse Enable to cause the SE-330 K1 contact to cycle at a rate determined by the SE-330 front-panel Pulse Period switch. Ensure that SE-330 configuration switch S1 is set to K1=Pulse. CAUTION: For models equipped with a CPT and/or FPI, the maximum supply voltage is 600 Vac.
2.1 INDICATION, METERING, AND RESET Surface-mount models include red panel-mounted Ground Fault and Resistor Fault LED’s that indicate the NGR-monitor trip state, and a green Control Power LED. Reset latched trips by pressing the Reset button when the trip condition is no longer present. NGR-monitor front-panel indication and reset is accessible when the door panel is open. Panel-mounted SE-330 face-plate indication is visible through the hinged transparent cover. Open the hinged transparent cover to access the SE-330 Reset button. Models equipped with earth-leakage metering continuously display earth-leakage current as a percentage of the ground-fault-CT-primary rating when the SE-330 is energized. All SE-330 models have a USB interface through which NGR-resistance-change, neutral-voltage and current metering is accessible with a PC running SE-MON330 software that is available at Littelfuse.com. This data is also accessible through the optional network-communications interface. 2.2 CONFIGURATION AND SETTINGS Factory configuration is per the SE-325 or SE-330 manual, except that SE-330 models equipped with a pulse-enable switch have configuration switch S1 set to K1=Pulse. Adjust settings as required – refer to the appropriate manuals.
Page 2 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
3. INSTALLATION 3.1 TYPE 4X ENCLOSURE The 455 x 340 x 175 mm polyester enclosure has a hinged front panel with dual lockable latches. For wall mounting, attach the included mounting brackets to the back of the enclosure with the enclosed fasteners, and prepare the mounting surface using the dimensions as shown in Fig. 1. All models ship with no predrilled cable entry. An appropriate hole or holes must be made in the enclosure for the installation of all conductors. Space is allowed at the bottom for cable entry. See Figs. 4, 7, and 10. Use appropriate cable-entry fittings. 3.2 CONNECTIONS TO THE NEUTRAL-GROUNDING-RESISTOR AND CURRENT TRANSFORMER For all models, connect NGRM-ENC terminal R to an ER-series sensing resistor(1) terminal R. Follow SE-325 or SE-330 manual guidelines for wire size selection. See Figs. 2 and 3. All models connect to a current transformer(1), which measures NGR current. The sensing resistor and CT are typically located in the NGR enclosure. 3.2.1 SE-325 MODELS Connect the CT200 current transformer(1) secondary to NGRM-ENC terminals CT1 and CT2. Connections are not polarity sensitive. Follow SE-325 manual guidelines for wire size selection. See Fig. 2. 3.2.2 SE-330 MODELS For sensitive EFCT- or SE-CS30-series current sensors(1), connect to NGRM-ENC terminals S and C. For 5-A-secondary CT’s connect to terminals 5 and C. A field-wiring change is required for 1-A-secondary CT connections. See Fig. 3. CT connections are not polarity sensitive. Follow SE-330 manual guidelines for wire size selection. 3.3 SUPPLY VOLTAGE CONNECTION Appropriate supply-voltage fusing is provided for all models. Connect terminal GND to system ground. 3.3.1 SUPPLY BY FIELD CONNECTION For models requiring field-supply-voltage connections, connect line and neutral to NGRM-ENC terminals L and N. See Figs. 2 and 3. SE-325 and SE-330 models require a 120-Vac supply. Consult the appropriate product manual for power requirements.
3.3.2 CONTROL POWER TRANSFORMER (CPT) MODELS Models equipped with a CPT are compatible with 480- and 600-V systems, and are factory-connected for a 600-V system. Field adjustment for a 480-V system is required by moving the T1H3 connection on T1 to the H2 terminal of T1. Connect NGRM-ENC terminals ØA and ØB to the 480- or 600-V bus using 14 to 6 AWG (2.08 to 13.3 mm2) wire. See Figs. 2 and 3. 3.4 PHASE-VOLTAGE INDICATION For models equipped with phase-voltage and faulted-phase indication, connect NGRM-ENC terminals ØA, ØB, and ØC to the 480- or 600-V bus using 14 to 6 AWG (2.08 to 13.3 mm2). See Figs. 2 and 3. These terminals are shared by the CPT connections for models so equipped. 3.5 RELAY-OUTPUT CONNECTIONS For external alarm or trip indication and protection, connect to SE-325 A-B relay output or SE-330 K1 relay output by connecting to NGRM-ENC terminals 301 and 302. A field-wiring change is required if a supply-voltage connection is required to the relay output(s) within the NGRM-ENC. Field wiring is required if connection to SE-330 relay outputs K2, K3, and K4 is required. See Figs. 2 and 3 and the appropriate product manual. NOTE: The SE-330 surface-mount options use relays K2 and K3 for panel-mounted ground-fault and resistor-fault indication respectively. 3.6 NETWORK-COMMUNICATIONS CONNECTIONS
For SE-330 models equipped with a communications option, connect directly to the SE-330 network interface, referring to the appropriate product manual. 3.7 DIELECTRIC-STRENGTH TESTING
Remove the connections at the SE-325 and SE-330 L1 and L2 terminals, and remove the connection to the EL3100 terminal 19 (if installed), before performing dielectric-strength testing. Ensure that all connections are reconnected and securely fastened after any tests. See Figs. 2 and 3. NOTES: (1) Not included with the NGRM-ENC.
Page 3 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. PANEL-MOUNTED SE-330 MODEL SHOWN.
(16.00)
406.2(10.40)
264.0
(17.
87
)
45
3.8
43
6.6
(17.
19
)
(13.00)
330.5
SIDE FRONT
REAR
(MOUNTING DETAIL)
NGRM-ENC
ON
PHASEA
PHASE B
PHASEC
0.1
0.5 0.7 1.02.03.0
5.010.0
4
108
2040
606 80
100MEM2
1.01.2
1.41.6
1.8 2.0 2.22.42.6
2.83.0
SE-330NEUTRAL-GROUNDING-RESISTOR MONITOR
0.2
0.30.4
CAL
RESET
GF TRIP TIME (s) PULSE PERIOD (s)
GF TRIP LEVEL(% CT RATING)
LITTELFUSE STARTCO
TRIP
GROUNDFAULT
POWER
RELAY K1
DIAGNOSTIC
CALIBRATED
TRIP
RESISTORFAULT
60
170130
200340
800100 1200
1700200020
V TRIP LEVELN( )S5 20 K
V x 1N 100 KV x 5N
Ω Ω
PULSEENABLE
LEAKAGE CURRENT
OFF
FIGURE 1. NGRM-ENC Outline and Mounting Details.
Page 4 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
*EL3100
AH
BH
CH
G
DC10
DB11
DA12
DN15
DS4GRN
DS3GRN
DS2GRN
401
402
403
404
SE-325
SW GI
306
303
305
304
+ RI R G
R
PB1
RESET
LT3
RESISTOR FAULT
X1 X2
RED
LT2
GROUND FAULT
X1 X2
RED
SE-325 FACTORY SETTINGS
GF TRIP TIME: 0.1 SEC
GF TRIP LEVEL: 0.5 A
MODE: UV
RESISTOR: 20K
RESISTOR TRIP LEVEL: 20
ADJUST AS REQUIRED.
SHLD
CT2
CT1
CT1 CT2 A B L1 L2
CT1
CT2WHT
BLK
301 302LT1
CONTROL POWER
X1 X2
GRN
N
R
L
F1
0.8 A
X1
X3 X2
X4
H1
120V 120V
H2 H3480V
*T1
600/480 120/240 150 VA
T1H
1
T1H
2
T1H
3
T1X
1
N L
*F2
0.5 A
*F3
0.5 A*F4
0.5 A
ØA ØB ØC
T1X
2
K1
1
3
5
19
600V
OPTIONAL
INCOMING 120V
BY CUSTOMER
OPTIONAL INCOMING
480V/600V
BY CUSTOMER
GND
NOTES:
1. RELAY CONTACTS SHOWN WITH
SE-325 DE-ENERGIZED.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
*PHASE A
*PHASE B
*PHASE C
FIGURE 2. SE-325 Typical Wiring Diagram.
Page 5 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
L1
+
8 9 10 11
S 1 5 C
1
22
26
29
12
14
15
16
17
3
4
5
REMOTE
RESET
PULSE
ENABLE
SE-330
SPGA
SPG
PULSE ENABLE
RESET
NC
K4
RF
K3
GF
K2
K1
R
G
L2/N
+24V
-
0V
6
7
2
23
24
25
27
28
13
18
19
20
21
LT3
RESISTOR FAULT
IDC305
306
307
SE-330 FACTORY SETTINGS
GF TRIP TIME: 0.5 SEC
GF TRIP LEVEL: 20%
VN TRIP LEVEL: 60 V
ADJUST AS REQUIRED.
K2 MODE: NON-FAIL-SAFE
K3 MODE: NON-FAIL-SAFE
308
309
+ -
X1304 X2
RED
LT2
GROUND FAULT
X1303 X2
RED
302301
LT1
CONTROL POWER
X1 X2
GRN
5
S
C
SHLD
R
N
L
F1
0.8 A
T1
X2
*EL3100*T1
600/480 120/240 150 VA
*F2
0.5 A
*F3
0.5 A
*F4
0.5 A
N L
OPTIONAL
INCOMING 120V
BY CUSTOMER
OPTIONAL INCOMING
480V/600V
BY CUSTOMER
AH1
BH3
CH5
G19
DC10
DB11
DA12
DN15
DS4GRN
RED
WHT
BLK
DS3GRN
DS2GRN
401
402
403
404
RED
WHT
BLK
ØA ØB ØC
PB1
RESET DS1
C
S
5
X1
X3 X2
X4
H1
120V 120V
H2 H3480V
T1
H1
T1
H2
T1
H3
T1
X1
600V
GND
*PHASE A
*PHASE B
*PHASE C
(OPTIONAL)
NOTE 1
NOTE 1
NOTE 1
NOTE 1
EARTH-LEAKAGE
CURRENT (OPTIONAL)
NOTES:
1. SURFACE-MOUNT MODELS ONLY.
2. RELAY CONTACTS SHOWN WITH
SE-330 DE-ENERGIZED.
3. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
FIGURE 3. SE-330 Typical Wiring Diagram.
Page 6 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
NOTE:
1. SHOWN WITH ALL OPTIONS AVAILABLE.
SIDE
INTERIOR
FRONT
NGRM-ENC
CONTROL POWER
GROUNDFAULT
RESISTORFAULT
RESET
PHASE A
PHASE B
PHASEC
F 1
R E S E TG R O U N DF A U L T
G F T R I PT I M E ( s )
R E S I S T O RF A U L T
R E S T R I PL E V E L ( V A C )
C T 1 C T 2 A B L 1 L 2
M O D E R E SG F2 0 4 0 0
2 0 0
0 . 1 2 . 0
1 . 0
4 . 0 A
2 . 0 A0 . 5 A
S H
U V 2 0 KP O W E R
R GR IG IS W
N G R M O N I T O RSE-325
DIS
PLA
Y 208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
GNDGNDGND
CT2CT1
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
T1 150 VA
OPTIONAL INCOMING
120 VAC BY CUSTOMER
*T1X2
*T1X1
TB
1
GND BLOCK
CT
M
SE-325
GND BLOCK
TB1T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3
F3
*NOTE 1
*T1150 VA
SE
-32
5(G
)*
EL
310
0(1
9)
SE
-32
5(C
T1
)
SE
-32
5(G
ND
)T
B1
*T
1X
2
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
LSE-325(L1)LT1(X1)
LLN
N
SE-325(L2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-325(A)
SE-325(B)
SE-325(CT2)
SE-325(CT1)
SE-325(R)
BLK
WHT
301302
CTM
CT2CT1
SHLDR
TB1
SE-325
TRIP
NGR
ENCLOSURE
DOOR WIRING
(REAR VIEW)
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0)4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
TB
1
TB
1
SH
LD
BLK
WH
T
301
30
2L N
GND BLOCK
CT
2
CT
1
BA L2
L1
GI
5W RI
+
GN
D
GR
30
63
03
30
53
04
RT
B1
LT
2
LT
3
GN
D B
LO
CK
PB
1
SE-325(+)305
PB1
RESET
LT2
GROUND
FAULT
LT3
RESISTOR
FAULT
SE-325(GI)
SE-325(RI)
SE-325(SW)
304
306
303X1
X1 X2
X2
RED
RED
TB1
LT1
CONTROL
POWER
TB1N LX2 X1
GRN
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
GND BLOCK
LT1(X2)
FIGURE 4. SE-325 Model (NGRM-ENC-100-01) Interior/Exterior Details.
Page 7 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
F 1
R E S E TG R O U N DF A U L T
G F T R I PT I M E ( s )
R E S I S T O RF A U L T
R E S T R I PL E V E L ( V A C )
C T 1 C T 2 A B L 1 L 2
M O D E R E SG F2 0 4 0 0
2 0 0
0 . 1 2 . 0
1 . 0
4 . 0 A
2 . 0 A0 . 5 A
S H
U V 2 0 KP O W E R
R GR IG IS W
N G R M O N I T O RSE-325
DIS
PLA
Y 208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
GNDGNDGND
CT2CT1
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
T1 150 VA
FIGURE 5. SE-325 Model (NGRM-ENC-100-01) Interior Details.
Page 8 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
OPTIONAL INCOMING
120 VAC BY CUSTOMER
*T1X2
*T1X1
TB
1
GND BLOCK
CT
M
SE-325
GND BLOCK
TB1T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3
F3
*NOTE 1
*T1150 VA
SE
-32
5(G
)*
EL
310
0(1
9)
SE
-32
5(C
T1
)
SE
-32
5(G
ND
)T
B1
*T
1X
2
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
LSE-325(L1)LT1(X1)
LT1(X2)
LLN
N
SE-325(L2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-325(A)
SE-325(B)
SE-325(CT2)
SE-325(CT1)
SE-325(R)
BLK
WHT
301302
CTM
CT2CT1
SHLDR
TB1
SE-325
TRIP
NGR
ENCLOSURE
DOOR WIRING
(REAR VIEW)
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0)4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
TB
1
TB
1
SH
LD
BLK
WH
T
301
30
2L N
GND BLOCK
CT
2
CT
1
BA L2
L1
GI
5W RI
+
GN
D
GR
30
63
03
30
53
04
RT
B1
LT
2
LT
3
GN
D B
LO
CK
PB
1
SE-325(+)305
PB1
RESET
LT2
GROUND
FAULT
LT3
RESISTOR
FAULT
SE-325(GI)
SE-325(RI)
SE-325(SW)
304
306
303X1
X1 X2
X2
RED
RED
TB1
LT1
CONTROL
POWER
TB1N LX2 X1
GRN
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
GND BLOCK
FIGURE 6. SE-325 Model (NGRM-ENC-XX0-XX) Wiring Label.
Page 9 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
NOTE:
1. SHOWN WITH ALL OPTIONS AVAILABLE.
SIDE
INTERIOR
FRONT
DIS
PLA
Y 208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
NGRM-ENC
CONTROL POWER
GROUNDFAULT
RESISTORFAULT
RESET
USB
PHASE A
PHASE B
PHASEC
ON
PULSEENABLE
LEAKAGE CURRENT
OFF
0.1
0.5 0.7 1.02.03.0
5.010.0
4
108
2040
606 80
100MEM2
1.01.2
1.41.6
1.8 2.0 2.22.42.6
2.83.0
SE-330NEUTRAL-GROUNDING-RESISTOR MONITOR
0.2
0.30.4
CAL
RESET
GF TRIP TIME (s) PULSE PERIOD (s)
GF TRIP LEVEL(% CT RATING)
LITTELFUSE STARTCO
TRIP
GROUNDFAULT
POWER
RELAY K1
DIAGNOSTIC
CALIBRATED
TRIP
RESISTORFAULT
60
170130
200340
800100 1200
1700200020
V TRIP LEVELN( )S5 20 K
V x 1N 100 KV x 5N
Ω Ω
GNDGNDGND
5SC
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
T1 150 VA
OPTIONAL INCOMING
120 VAC BY CUSTOMER
*T1X2
*T1X1
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
SHLD
GND
305306
307
12131415161718192021
PB1
*S1
*DS1(+)
*DS1(-)
308309
301302TB1
2223
2829
12345
TB1
L
NGND GND BLOCK
67
R
BLK
TB1
GND BLOCK
89
1011
WHT
RED
CTM
TB1
GRNGND BLOCK
SE-330
GND BLOCK
TB2T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3
F3
*NOTE 1
*T1150 VA
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
SE-330(29)
SE-330(26)SE-330(1)LT1(X1) L
LLN
N
SE-330(2)
LT1(X2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-330(22)
SE-330(23)SE-330(10)SE-330(8)
SE-330(11)
SE-330(6)
BLK
WHT
RED
301302
CTM
5SC
SHLDR
TB1
SE-330
TRIP
NGR
ENCLOSURE
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
DOOR WIRING (REAR VIEW)
24252627
TB1
TB1
LT2
LT3
303
304
L
L
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0)4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
SE-330(17) SE-330(16)
SE-330(20) SE-330(21)
*DS1308 309+ -
Idc
307 306
*S1
PULSE
SE-330(15)305
PB1
RESET
TB1
LT1
CONTROL
POWER
LT2
GROUND
FAULT
LT3
RESISTOR
FAULT
TB1
SE-330(24)
SE-330(27)
303
304
N L
N
X2
X2
X2
X1
X1
X1
GRN
RED
RED
GND BLOCK
*T
1X
2T
B1
*E
L3
10
0(1
9)
SE
-33
0(7
)S
E-3
30
(3)
SE
-33
0(1
1)
FIGURE 7. SE-330 Surface-Mount Model (NGRM-ENC-XX0-21) Interior/Exterior Details.
Page 10 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
T1 150 VA
DIS
PLA
Y
208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
GNDGNDGND
5SC
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
0.1
0.5 0.7 1.02.03.0
5.010.0
4
108
2040
606 80
100MEM2
1.01.2
1.41.6
1.8 2.0 2.22.42.6
2.83.0
SE-330NEUTRAL-GROUNDING-RESISTOR MONITOR
0.2
0.30.4
CAL
RESET
GF TRIP TIME (s) PULSE PERIOD (s)
GF TRIP LEVEL(% CT RATING)
LITTELFUSE STARTCO
TRIP
GROUNDFAULT
POWER
RELAY K1
DIAGNOSTIC
CALIBRATED
TRIP
RESISTORFAULT
60
170130
200340
800100 1200
1700200020
V TRIP LEVELN( )S5 20 K
V x 1N 100 KV x 5N
Ω Ω
FIGURE 8. SE-330 Surface-Mount Model (NGRM-ENC-XX0-X1) Interior Details.
Page 11 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
OPTIONAL INCOMING
120 VAC BY CUSTOMER
*T1X2
*T1X1
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
SHLD
GND
305306
307
12131415161718192021
PB1
*S1
*DS1(+)
*DS1(-)
308309
301302TB1
2223
2829
12345
TB1
L
NGND GND BLOCK
67
R
BLK
TB1
GND BLOCK
89
1011
WHT
RED
CTM
TB1
GRNGND BLOCK
SE-330
GND BLOCK
TB2T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3
F3
*NOTE 1
*T1150 VA
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
SE-330(29)
SE-330(26)SE-330(1)
LT1(X1) LLLN
N
SE-330(2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-330(22)
SE-330(23)SE-330(10)SE-330(8)
SE-330(11)
SE-330(6)
BLK
WHT
RED
301302
CTM
5SC
SHLDR
TB1
SE-330
TRIP
NGR
ENCLOSURE
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
DOOR WIRING (REAR VIEW)
24252627
TB1
TB1
LT2
LT3
303
304
L
L
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0)4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
SE-330(17) SE-330(16)
SE-330(20) SE-330(21)
*DS1308 309+ -
Idc
307 306
*S1
PULSE
SE-330(15)305
PB1
RESET
TB1
LT1
CONTROL
POWER
LT2
GROUND
FAULT
LT3
RESISTOR
FAULT
TB1
SE-330(24)
SE-330(27)
303
304
N L
N
X2
X2
X2
X1
X1
X1
GRN
RED
RED
GND BLOCK
*T
1X
2T
B1
*E
L310
0(1
9)
SE
-330(7
)S
E-3
30(3
)
SE
-330(1
1)
LT1(X2)
FIGURE 9. SE-330 Surface-Mount Model (NGRM-ENC-XX0-XX) Wiring Label.
Page 12 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
NOTE:
1. SHOWN WITH ALL OPTIONS AVAILABLE.
SIDE
INTERIOR
FRONT
NGRM-ENC
ON
PHASEA
PHASE B
PHASEC
0.1
0.5 0.7 1.02.03.0
5.010.0
4
108
2040
606 80
100MEM2
1.01.2
1.41.6
1.8 2.0 2.22.42.6
2.83.0
SE-330NEUTRAL-GROUNDING-RESISTOR MONITOR
0.2
0.30.4
CAL
RESET
GF TRIP TIME (s) PULSE PERIOD (s)
GF TRIP LEVEL(% CT RATING)
LITTELFUSE STARTCO
TRIP
GROUNDFAULT
POWER
RELAY K1
DIAGNOSTIC
CALIBRATED
TRIP
RESISTORFAULT
60
170130
200340
800100 1200
1700200020
V TRIP LEVELN( )S5 20 K
V x 1N 100 KV x 5N
Ω Ω
PULSEENABLE
LEAKAGE CURRENT
OFF
DIS
PLA
Y 208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
GNDGNDGND
5SC
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
T1 150 VA
OPTIONAL INCOMINGOPTIONAL INCOMING
120 VAC BY CUSTOMER120 VAC BY CUSTOMER
SHLDSHLD
GNDGND
306306
307307
1212131314141515161617171818191920202121
*S1*S1
*DS1(+)*DS1(+)
*DS1(-)*DS1(-)
308308309309
301301302302 TB1TB1
22222323
242425252626272728282929
12345
TB1TB1
L
NGNDGNDGND BLOCKGND BLOCK
67
R
BLKBLK
TB1TB1
GND BLOCKGND BLOCK
89
10101111
WHTWHT
REDRED
CTMCTM
TB1TB1
GRNGRNGND BLOCKGND BLOCK
SE-330SE-330
GND BLOCKGND BLOCK
TB2TB2T1X2T1X2
T1X1T1X1F1F1
T1H1T1H1
T1H2T1H2
T1H3T1H3
F2F2
F3F3*NOTE 1*NOTE 1
*T1*T1150 VA150 VA
GND BLOCKGND BLOCK
*T
1X
2*
T1
X2
TB
1T
B1
*E
L310
0(1
9)
*E
L310
0(1
9)
SE
-330(7
)S
E-3
30
(7)
SE
-330(3
)S
E-3
30
(3)
SE
-330(1
1)
SE
-330
(11
)
*DS4*DS4*DS3*DS3
*DS2*DS2
401401402402
403403
404404*DS2*DS2
101011111212131314141515
1616171718181919
987
654321
*F4*F4
*F3*F3
*F2*F2GND BLOCKGND BLOCK
*EL3100*EL3100
SE-330(1)SE-330(1)LLLN
N
SE-330(2)SE-330(2)
OPTIONAL INCOMINGOPTIONAL INCOMING
480 / 600 V BY CUSTOMER480 / 600 V BY CUSTOMER
F1 - 0.8 AF1 - 0.8 A
*F2 - 0.5 A*F2 - 0.5 A
*F3 - 0.5 A*F3 - 0.5 A
*F4 - 0.5 A*F4 - 0.5 A
*T1H3*T1H3
*T1H1*T1H1*EL3100(1)*EL3100(1)
*EL3100(3)*EL3100(3)
*EL3100(5)*EL3100(5)
ØAØA
ØBØB
ØCØC
GNDGNDGNDGNDGNDGND
GRNGRNGND BLOCKGND BLOCK
SE-330(22)SE-330(22)
SE-330(23)SE-330(23)SE-330(10)SE-330(10)SE-330(8)SE-330(8)
SE-330(11)SE-330(11)
SE-330(6)SE-330(6)
BLKBLK
WHTWHT
REDRED
301301302302
CTMCTM
5SC
SHLDSHLDR
TB1TB1
SE-330 SE-330
TRIPTRIP
NGRNGR
ENCLOSUREENCLOSURE
DOOR WIRINGDOOR WIRING
(REAR VIEW)(REAR VIEW)
*E
L310
0(1
2)
*E
L310
0(1
2)
*E
L310
0(1
1)
*E
L310
0(1
1)
*E
L310
0(1
0)
*E
L310
0(1
0)4
03
40
3
401
401
402
40
2
*D
S2
*D
S2
*D
S4
*D
S4
*D
S3
*D
S3
404404*EL3100(15)*EL3100(15)
SE-330(20)SE-330(20)
SE-330(17)SE-330(17)
SE-330(21)SE-330(21)
SE-330(16)SE-330(16)
*DS1*DS1308308 309309+ -
IdcIdc
307307 306306
*S1*S1
PULSEPULSE
NOTES:NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2. FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL. OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING 3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC. 90ºC.
4.DASHED LINES INDICATE FIELD WIRING.4.DASHED LINES INDICATE FIELD WIRING.
F3F3
0.8 A, 600 VAC 0.8 A, 600 VAC
LITTELFUSE KLDR.800TXPLITTELFUSE KLDR.800TXP
RATINGRATING
0.5 A, 600 VAC0.5 A, 600 VAC
LITTELFUSE KLK.500LITTELFUSE KLK.500
FUSEFUSE
F2, F3, F4F2, F3, F4
F1F1
*T1X2*T1X2
*T1X1*T1X1
FIGURE 10. SE-330 Panel-Mount Model (NGRM-ENC-XX1-21) Interior/Exterior Details.
Page 13 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
DIS
PLA
Y 208/
240
EL3
100
SE
RIE
S
AFA
ULT
SH
480/
600
AH
BH
CH
AL
BL
CL
DN
DR
DG
DA
DB
DC
1917
1816
1513
1412
1110
12
64
53
98
7
CB
G
GR
OU
ND
-FA
ULT
& P
HA
SE
-VO
LTA
GE
IND
ICA
TOR
GNDGNDGND
5SC
SHLDR
ØA(F2)0.5 A600V
ØB(F3)0.5 A600V
301302
L(F1)0.8 A600V
ØC(F4)0.5 A600V
T1 150 VA
OPTIONAL INCOMING
120 VAC BY CUSTOMER
SHLD
GND
306
307
12131415161718192021
*S1
*DS1(+)
*DS1(-)
308309
301302 TB1
2223
242526272829
12345
TB1
L
NGNDGND BLOCK
67
R
BLK
TB1
GND BLOCK
89
1011
WHT
RED
CTM
TB1
GRNGND BLOCK
SE-330
GND BLOCK
TB2T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3*NOTE 1
*T1150 VA
GND BLOCK
*T
1X
2T
B1
*E
L3
10
0(1
9)
SE
-33
0(7
)S
E-3
30
(3)
SE
-33
0(1
1)
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
SE-330(1)LLLN
N
SE-330(2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-330(22)
SE-330(23)SE-330(10)SE-330(8)
SE-330(11)
SE-330(6)
BLK
WHT
RED
301302
CTM
5SC
SHLDR
TB1
SE-330
TRIP
NGR
ENCLOSURE
DOOR WIRING
(REAR VIEW)
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0) 4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
SE-330(20)
SE-330(17)
SE-330(21)
SE-330(16)
*DS1308 309+ -
Idc
307 306
*S1
PULSE
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
F3
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
*T1X2
*T1X1
LT1(X1)
FIGURE 11. SE-330 Panel-Mount Model (NGRM-ENC-XX1-X1) Interior Details.
Page 14 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
OPTIONAL INCOMING
120 VAC BY CUSTOMER
SHLD
GND
306
307
12131415161718192021
*S1
*DS1(+)
*DS1(-)
308309
301302 TB1
2223
242526272829
12345
TB1
L
NGNDGND BLOCK
67
R
BLK
TB1
GND BLOCK
89
1011
WHT
RED
CTM
TB1
GRNGND BLOCK
SE-330
GND BLOCK
TB2T1X2
T1X1F1
T1H1
T1H2
T1H3
F2
F3*NOTE 1
*T1150 VA
GND BLOCK
*T
1X
2T
B1
*E
L3
10
0(1
9)
SE
-33
0(7
)S
E-3
30
(3)
SE
-33
0(1
1)
*DS4*DS3
*DS2
401402
403
404*DS2
101112131415
16171819
987
654321
*F4
*F3
*F2GND BLOCK
*EL3100
SE-330(1)
LT1(X1) LLLN
N
SE-330(2)
OPTIONAL INCOMING
480 / 600 V BY CUSTOMER
F1 - 0.8 A
*F2 - 0.5 A
*F3 - 0.5 A
*F4 - 0.5 A
*T1H3
*T1H1*EL3100(1)
*EL3100(3)
*EL3100(5)
ØA
ØB
ØC
GNDGNDGND
GRNGND BLOCK
SE-330(22)
SE-330(23)SE-330(10)SE-330(8)
SE-330(11)
SE-330(6)
BLK
WHT
RED
301302
CTM
5SC
SHLDR
TB1
SE-330
TRIP
NGR
ENCLOSURE
DOOR WIRING
(REAR VIEW)
*E
L3
10
0(1
2)
*E
L3
10
0(1
1)
*E
L3
10
0(1
0) 4
03
401
40
2
*D
S2
*D
S4
*D
S3
404*EL3100(15)
SE-330(20)
SE-330(17)
SE-330(21)
SE-330(16)
*DS1308 309+ -
Idc
307 306
*S1
PULSE
NOTES:1. T1 IS SET FOR 600V INCOMING. FOR 480V
INCOMING, MOVE F3-TO-T1 CONNECTION
FROM T1H3 TO T1H2.
2. DESIGNATORS WITH LEADING “*” ARE
OPTIONAL.
3. MINIMUM SUPPLY CONDUCTOR RATING
90ºC.
4.DASHED LINES INDICATE FIELD WIRING.
F3
0.8 A, 600 VAC
LITTELFUSE KLDR.800TXP
RATING
0.5 A, 600 VAC
LITTELFUSE KLK.500
FUSE
F2, F3, F4
F1
*T1X2
*T1X1
FIGURE 12. SE-330 Panel-Mount Model (NGRM-ENC-XX1-XX) Wiring Label.
Page 15 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
4. TECHNICAL SPECIFICATIONS
Supply: NGRM-ENC-000-00 ............ 12 VA, 120 Vac
(+10, -45%), 60 Hz NGRM-ENC-100-00 EL3100 ............................... 2 mA, 480/600 Vac,
60 Hz, 3-phase, 3-wire (no neutral)
Monitor ............................... 12 VA, 120 Vac (+10, -45%), 60 Hz
NGRM-ENC-000-01, NGRM-ENC-100-01 ............ 14 VA, 480/600 Vac,
60 Hz, 3-phase, 3-wire (no neutral)
NGRM-ENC-2XX-X0, NGRM-ENC-4XX-X0, NGRM-ENC-6XX-X0, NGRM-ENC-8XX-X0 .......... 32 VA, 120 Vac
(+10, -45%), 60 Hz NGRM-ENC-3XX-X0, NGRM-ENC-5XX-X0, NGRM-ENC-7XX-X0, NGRM-ENC-9XX-X0 EL3100 ............................... 2 mA, 480/600 Vac,
60 Hz, 3-phase, 3-wire (no neutral)
Monitor ............................... 32 VA, 120 Vac (+10, -45%), 60 Hz
NGRM-ENC-2XX-X1, NGRM-ENC-3XX-X1, NGRM-ENC-4XX-X1, NGRM-ENC-5XX-X1, NGRM-ENC-6XX-X1, NGRM-ENC-7XX-X1, NGRM-ENC-8XX-X1, NGRM-ENC-9XX-X1 .......... 34 VA, 480/600 Vac,
60 Hz 3-phase, 3-wire (no neutral)
Wiring Requirements: Terminals Blocks: Conductor Size ................. 20 to 10 AWG (0.52 to 5.26 mm2)
Fuseholders: Conductor Size ................. 14 to 6 AWG
(2.08 to 13.29 mm2)
Fuse Requirements: F1: Fuse Rating ...................... 0.8 A, 600 Vac, Class CC Fuse Part Number ............ Littelfuse KLDR.800T or KLDR.800TXP (RoHS) F2 to F4 (see order options): Fuse Rating ...................... 0.5 A, 600 Vac, Fuse Part Number ............ Littelfuse KLK.500 Dimensions: Height ................................. 454 mm (17.9”) Width .................................. 406 mm (16.0”) Maximum Depth (with SE-IP65CVR-G installed) .. 264 mm (10.4”) Clearance required to open SE-IP65CVR-G .................. 112 mm (4.4”)
Shipping Dimensions: NGRM-ENC-XXX-XX: Height .............................. 516 mm (20.3”) Width ............................... 465 mm (18.3”) Depth ............................... 309 mm (12.2”) Shipping Weight: NGRM-ENC-XXX-XX ........ 13.6 kg (30 lb) maximum Enclosure ................................. Polyester, Lockable Ratings: SE-325 Order Options ..... Type 4X SE-330 Surface-Mount Order Options .................. Type 4X SE-330 Panel-Mount Order Options .................. IP65
Environment: Operating Temperature ......... -40 to 60°C (-40 to 140°F) Storage Temperature ............. -55 to 80°C (-67 to 176°F) Humidity ................................ 85% Non-Condensing Certification ................................. CSA, Canada and USA
LR 53428
USC
R
To: CSA C22.2 No. 144 Ground Fault Circuit
Interrupters CSA C22.2 No. 94 Special Purpose Enclosures UL 1053 Ground Fault Sensing and Relaying
Equipment UL 50 Enclosures for Electrical Equipment
Page 16 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
5. ORDERING INFORMATION -NGRM-ENC-
Control-Power Transformer
Option0 No CPT
1 480/600-V CPT(1)
NGR Monitor Mounting Option
0 Surface-mounted NGR
monitor(4)
1 Panel-mounted NGR monitor(5)
Protection Relay Option
0 SE-325
1 SE-325 & voltage indication(1)
2 SE-330 (N.O. K4)
3 SE-330 (N.O. K4) & voltage
indication(1)
4 SE-330 (N.C. K4)
5 SE-330 (N.C. K4) & voltage
indication(1)
6 SE-330HV (N.O. K4)
7 SE-330HV (N.O. K4) & voltage
indication(1)
8 SE-330HV (N.C. K4)
9 SE-330HV (N.C. K4) & voltage
indication(1)
Network Communications
Option
0 No network communications
1 DeviceNet(2)
3 Ethernet, dual RJ45(2)
4 Ethernet, 1 RJ45 & 1 fiber(2)
5 Ethernet, dual fiber(2)
6 IEC 61850, dual RJ45(2)
7 IEC 61850, 1 RJ45 & 1 fiber(2)
8 IEC 61850, dual fiber(2)
Ammeter & Pulse Control
Option
0 No ammeter
1 Earth-leakage panel meter(2)
2 Earth-leakage panel meter &
pulse-enable switch(3)
NOTES: (1) Includes fuses. (2) SE-330 models only. (3) SE-330 models only, excluding SE-330HV models. (4) Includes panel-mounted indication & reset, and USB
connector for SE-330 models. (5) SE-330 models only; includes IP65 hinged transparent
cover.
6. WARRANTY
The NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor is warranted to be free from defects in material and workmanship for a period of one year from the date of purchase. Littelfuse Startco will (at Littelfuse Startco’s option) repair, replace, or refund the original purchase price of an NGRM-ENC that is determined by Littelfuse Startco to be defective if it is returned to the factory, freight prepaid, within the warranty period. This warranty does not apply to repairs required as a result of misuse, negligence, an accident, improper installation, tampering, or insufficient care. Littelfuse Startco does not warrant products repaired or modified by non-Littelfuse Startco personnel.
Page 17 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
APPENDIX A NGRM-ENC REVISION HISTORY
MANUAL RELEASE DATE
MANUAL REVISION
PRODUCT REVISION (REVISION NUMBER ON PRODUCT LABEL)
March 5, 2015 0-B-030515 00
April 25, 2014 0-A-042514
MANUAL REVISION HISTORY REVISION 0-B-030515 SECTION 1 Added enclosure ratings. SECTION 3 Updated Figs. 2, 3, 7, 11, and 12. SECTION 4 Added enclosure ratings and CSA certification. APPENDIX A Updated revision history. REVISION 0-A-042514 Initial release. PRODUCT REVISION HISTORY REVISION 00 Initial release.
Page 18 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515
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