NGRM-ENC MANUAL ENCLOSED NEUTRAL-GROUNDING …/media/protection-relays/... · 2015-03-25 · Page 2 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515 3. INSTALLATION

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

This page intentionally left blank.

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


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.


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.


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


0.2

0.30.4

CAL

RESET



LITTELFUSE STARTCO

TRIP

GROUNDFAULT

POWER

RELAY K1

DIAGNOSTIC

CALIBRATED

TRIP

RESISTORFAULT

60

170130

200340

800100 1200

1700200020


V x 1N 100 KV x 5N

Ω Ω

PULSEENABLE

LEAKAGE CURRENT

OFF

FIGURE 1. NGRM-ENC Outline and Mounting Details.


*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.


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.


OPTIONAL.

FIGURE 3. SE-330 Typical Wiring Diagram.


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.


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.


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.


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


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



FROM T1H3 TO T1H2.


OPTIONAL.


90ºC.


0.8 A, 600 VAC


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.


NOTE:


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


0.2

0.30.4

CAL

RESET



LITTELFUSE STARTCO

TRIP

GROUNDFAULT

POWER

RELAY K1

DIAGNOSTIC

CALIBRATED

TRIP

RESISTORFAULT

60

170130

200340

800100 1200

1700200020


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


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


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



FROM T1H3 TO T1H2.


OPTIONAL.


90ºC.


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.


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


0.2

0.30.4

CAL

RESET



LITTELFUSE STARTCO

TRIP

GROUNDFAULT

POWER

RELAY K1

DIAGNOSTIC

CALIBRATED

TRIP

RESISTORFAULT

60

170130

200340

800100 1200

1700200020


V x 1N 100 KV x 5N

Ω Ω

FIGURE 8. SE-330 Surface-Mount Model (NGRM-ENC-XX0-X1) Interior Details.


OPTIONAL INCOMING

120 VAC BY CUSTOMER

*T1X2

*T1X1

0.8 A, 600 VAC


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


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



FROM T1H3 TO T1H2.


OPTIONAL.


90ºC.


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.


NOTE:


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


0.2

0.30.4

CAL

RESET



LITTELFUSE STARTCO

TRIP

GROUNDFAULT

POWER

RELAY K1

DIAGNOSTIC

CALIBRATED

TRIP

RESISTORFAULT

60

170130

200340

800100 1200

1700200020


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.


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


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



FROM T1H3 TO T1H2.


OPTIONAL.


90ºC.


F3

0.8 A, 600 VAC


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.


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


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



FROM T1H3 TO T1H2.


OPTIONAL.


90ºC.


F3

0.8 A, 600 VAC


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.


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,


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,


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


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.


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.



Documents

NGRM-ENC MANUAL ENCLOSED NEUTRAL-GROUNDING …/media/protection-relays/... · 2015-03-25 · Page 2 NGRM-ENC Enclosed Neutral-Grounding-Resistor Monitor Rev. 0-B-030515 3. INSTALLATION