il01209003e - series c n-frame circuit breaker and molded case switches

8/10/2019 IL01209003E - Series C N-Frame Circuit Breaker and Molded Case Switches

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Contents

Description Page

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 22. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104. NES Digitrip 310 Trip Unit Adjustments . . . . . 115. Ground Fault Circuit Breakers . . . . . . . . . . . . 126. Inspection and Field Testing . . . . . . . . . . . . . 147. Performance Testing for Ground Fault

Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . 15

Effective October 2011Supersedes IL 01209003E Dated 1/08Instruction Leaet IL01209003E

Installation Instructions for N-FrameCircuit Breakers and Molded Case Switches


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Instruction Leaet IL01209003EEffective October 2011


EATON CORPORATION www.eaton.com

DO NOT ATTEMPT TO INSTALL OR PERFORMMAINTENANCE ON EQUIPMENT WHILE IT IS ENER-

GIZED. DEATH, SEVERE PERSONAL INJURY, ORSUBSTANTIAL PROPERTY DAMAGE CAN RESULTFROM CONTACT WITH ENERGIZED EQUIPMENT.ALWAYS VERIFY THAT NO VOLTAGE IS PRESENTBEFORE PROCEEDING WITH THE TASK, ANDALWAYS FOLLOW GENERALLY ACCEPTEDSAFETY PROCEDURES.

EATON IS NOT LIABLE FOR THE MISAPPLICATIONOR MISINSTALLATION OF ITS PRODUCTS.

The user is cautioned to observe all recommendations,warnings, and cautions relating to the safety of person-nel and equipment as well as general and local healthand safety laws, codes, and procedures.

This product is a direct replacement for Westinghousecircuit breakers. The recommendations and informationcontained herein are based on Eatons experience and

judgement, but should not be considered to be all-inclusive or covering every application or circumstancewhich may arise. If any questions arise, contact Eatonfor further information or instructions.

1. INTRODUCTION

The N-frame Circuit breakers (Figure 1-1 ) are 690 VACmaximum rated devices, 600 V for UL applications, andhave integral trip units and interchangeable rating plugs.

Available current ratings are up to 1600 Amp, 1200 forUL applications. Refer to Table 1.1 for available tripunits and Table 1.2 for available rating plugs. N-Frame

Circuit Breakers and molded case switches are listed inaccordance with Underwriters Laboratories, Inc. StandardUL-489 and satisfy the requirements of the InternationalElectrotechnical Commission Recommendations No.IEC 60947-2.

The Digitrip RMS 310 Trip Units are AC only devices

! WARNING

that employ microprocessor based technology thatprovides true RMS current sensing means for proper correlation with thermal characteristics of conductorsand equipment. The primary function of the Trip Unit iscircuit protection. This is achieved by analyzing the sec-ondary current signal received from the circuit breaker current sensors and initiating trip signals to the circuitbreaker shunt trip when pre-set current levels and timedelay settings are exceeded. Low level ground fault pro-tection with an adjustable time delay is supplied when

appropriate trip types are selected.

In open air at 40 o C, an N-frame circuit breaker with aDigitrip 310 trip unit will carry continuously up to 1200amperes without exceeding a 50 oC rise at the terminals.The calibration of the trip unit is insensitive to ambienttemperatures over a range of -20 o to +55 oC. However,the trip unit contains thermal temperature protective cir-cuitry that initiates a trip operation for self-protection if the internal ambient temperature at the printed circuitboard (PCB) reaches approximately 90 oC. For ambientconditions above 40 oC, derating of the circuit breaker should be considered to avoid exceeding a safe termi-nal temperature operating range. Consult Eaton for recommendations.

Figure 1-1 N-Frame Circuit Breaker.


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A Thermal Memory effect prevents the breaker frombeing reenergized immediately after an overload. Acooling off period of up to 5 minutes is required, whichallows time for the cabling to cool off.

Short delay/Instantaneous Trip: For short circuit con-ditions that exceed the short delay pick-up settings, thetrip units initiate a trip after a delay prescribed by the I 2tramp function for trip units designated T33 and T35. Aflat response time delay action is provided by trip unitsdesignated T32 and T36 unless the instantaneous (I)setting is selected.

tinUpir T013SMRpir tigiDsnoitcnuFtinUpir TT33 T32 T35 T36 K

Long Time Fixed Ampere Ratingwith Fixed Long Delay

Adjustable Ampere Settingwith Fixed Long Delay

Short Time Adjustable Short Time Pick-upwith Short Time Delay I 2t Ramp

Adjustable Short Time Delay with Adjustable Short Time Pick-up, or Adjustable Instantaneous Pick-up

Instantaneous Fixed Instantaneous (Override)

Ground Fault Adjustable Ground Fault Pick-upwith Adjustable Ground Fault Time

Fixed rating plugs available, see Table 1.2.Optional four-setting adjustable rating plugs available, see Table 1.2.Using trip unit with adjustable delay (T32, T36), instantaneous pick-up is achieved when thelowest time delay setting (I) is selected.Override setting fixed at frame withstand rating.

Table 1.1: Electronic (Digitrip 310) Trip Unit Types.

Molded Case Switches: The Molded Case Switch issimilar to the Circuit Breaker except that it does nothave a replaceable rating plug and has a different trip-ping characteristic. There is a fixed instantaneous trip at15,000 Ampere but there is no overload short delay or ground fault trip. As a result sections 2.6, 2.7, 4.5, 6.8

and 7 are not applicable. In the remaining sections, theterm circuit breaker shall also include the molded caseswitch.

trip in less time for higher overloads.within two hours for an overload of 135 percent, and aments, the trip unit initiates a trip of the circuit breaker Overload Trip: In accordance with standards require-

100 Percent Rated N-Frame Circuit Breaker: CircuitBreakers with a "C" prefix (CN...) in the catalog number are 100 percent rated circuit breakers and are suitablefor continuous operation at 100 percent of the framerating in an enclosure which measures at least 42 in.height, 22 in. width and 11 in. depth. The 800 Aversion requires no enclosure ventilation. The 1200 Aversion requires 224 in ventilation on the front face ofthe enclosure (72 in bottom, 40 in left and 40 in right).The 1200 A version also requires conductor extensionsand terminal barriers (supplied with 100 percent ratedbreakers) as shown in Figure 2-2. Use only 90C rated

wire with ampacity based on 75C rated conductors.Use only copper or AL9CU terminals.


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Ground Fault Protection: When selected, groundfault pick-up and time delay settings shown in Table 1.2allow selective ground fault coordination with other cir-cuit protection devices.

Ground Fault Alarm Unit: A ground fault alarm unitmay be used with the trip unit to provide visual indica-tion and a contact closure when a ground fault tripoccurs. The ground fault trip alarm unit is ordered andshipped separately as required.

DC Application: Digitrip 310 trip units are suitable for AC application only.

Field Testing: Test points are available for functionalfield testing of the trip unit when connected to test kit(Catalog No. STK2).

Internal Accessories: Internal accessories mount onthe Digitrip trip unit. A list of internal accessories andtheir instruction leaflets is provided below:

Alarm (Signal)/Lockout (ASL) Switch I.L. 29C184421C92.L.IhctiwSyr ailixu A841C92.L.Ipir TtnuhS

Low Energy Shunt Trip I.L. 29C145Undervoltage Release Mechanism

471C92.L.I)teseReldnaH(

Note: Shunt trip and undervoltage accessories, if required, must be mounted in the left pole.

Note: Digitrip 310 trip unit versions with groundfault protection are supplied with an auxiliaryswitch, mounted in the right pole of the trip unit.

Table 1.2: Electronic (Digitrip 310) Trip Unit Function and Rating Sensing.

Range/Setting DescriptionFixed rating plugs availableTrip Unit ampere Rating

Trip Function

Ampere RatingFixed at 100%

1250 Amp1200 Amp800 Amp

Fixed Rating Plugs

630,700 800,1000,1250A (In)600,700,800,1000,1200A (In)400,450,500,630,700,800A(In)

Adjustable rating plugsavailableTrip Unit Ampere Rating Adjustable Rating Plugs

Adjustable LongTime Pick-Up

1600 Amp1250 Amp1200 Amp

800 Amp

800,1000,1250,1600A (In)630,800,1000,1250A (In)600,800,1000,1200A (In)

400,500,630,800A (In)Short Delay Pick-Up (Adjustable) In Multiples of installed rating plug amperes (

Short Delay Time (Fixed) I t ramp congurationShort Delay Pick-up (Adjustable) Flat response with time delay settings at 100 ms, 200 ms, and 300 msInstantaneous Pick-Up In Multiples of installed rating plug amperes (In) with marks at 2-3-4-5-6-7-8x

Trip Unit Ampere Rating Trip Unit SettingGround FaultPick-up

(Adjustable)

1600 Amp1250 Amp1200 Amp800 Amp

200,400,600,800,1000 and 1200 Amp200,400,600,800,1000 and 1200 Amp200,400,600,800,1000 and 1200 Amp200,400,600 and 800 Amp

Ground Fault Time Delay Settings at Instantaneous (I ) 150 ms, 300 ms, and 500 msOccurs with short delay time adjustment set at l.The Molded Case Switch has a xed non-interchangeable rating plug.Not UL Listed.

1000 Amp 500, 630, 800, 1000 A (I n)

) with marks at 2-3-4-5-6-7-8xIn


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Figure 2-3 1600 Amp Rear Connector Installation (Connectors,Barriers, and Hardware Included).

Figure 2-3a 1600 Amp Front Conector Installation.

Figure 2-3b Detail for 1600 Amp Front Connect Long Conector.

Figure 2-3c Detail for 1600 Amp Front ConnectShort Connector.

All 1600 Amp N-Frames require Rear Connectorsor Front Connectors as shown in Figures 2-3 and2-3a.


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Figure 2-5 Breaker Mounting Bolt Drilling Plan - 800 A,1200 A, 1250 A Circuit Breaker and 1600 A Front Connected

0.312-18(M8-1.25) Tap4-Places CL Circuit

Breaker CL

CircuitBreaker

0.312-18(M8-1.25) Tap6-Places

Load End

CL Handle

1.375(34.92)

2.750(69.85)

2.750

(69.85)

2.750(69.85)

2- AND 3-POLE 4-POLE

8.625(219.65)

14.750(374.65)

6.125(155.57)

Dimensions

in Inches(Millimeters)

Install accessories per the accessory instruction leaflet.

CIRCUIT BREAKER COVER CONSTRAINS MOVING

PARTS. DO NOT OPERATE THE BREAKER WITH-OUT THE COVER INSTALLED.

! CAUTION

Figure 2-6 Circuit Breaker Escutcheon Dimensions.

C HandleL

3.438(87.31)

C L B r e a k e r

2.50 R(6.35 R)

1.718(43.64)

1.906(48.41)

5.587(141.91)

1.500(38.10)

3.187(80.95)

6.375(161.92)

.188 R(4.76 R)

FRONT COVER CUTOUT

Circuit Breakers.

Figure 2-4 1600 Amp Rear Connectors and BarriersInstalled (Required for 1600 Amp Rear Connect Breakers and Molded Case Switches).


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NylonRope

6 inches(152 mm)

Breaker

b. Install the rear connectors to the line and load side of the circuit breaker (Figure 2-3 ). Do not fully torque thebolts until after the barriers are positioned correctly. Onthree pole breakers the longer connectors are on thecenter phase. On four pole breakers, short and longconnectors should alternate on adjacent phases.

c. Install the barriers, covering the ends of the hardwareand connectors. Position the barriers so that the flapsare firmly set between the connectors and the edge of the base molding (Figure 2-4 ).

d. After positioning the barriers, torque the rear connec-tor bolts to 20 lb-ft., (27 Nm).

2.4 Mounting the Circuit Breaker

VOLTAGE IN ENERGIZED EQUIPMENT CAN CAUSEDEATH OR SEVERE PERSONAL INJURY. BEFOREMOUNTING THE CIRCUIT BREAKER IN AN ELEC-TRICAL SYSTEM MAKE SURE THERE IS NO VOLT-AGE PRESENT WHERE WORK IS PERFORMED.

SPECIAL ATTENTION SHOULD BE PAID TOREVERSE FEED APPLICATIONS TO ENSURE NOVOLTAGE IS PRESENT.

To mount the circuit breaker, perform the following steps:

800 A, 1200 A,1250 A, and 1600 A Front ConnectCircuit Breakers

a. For individual surface mounting, drill mounting panelusing the drilling plan shown in Figure 2-5 . For deadfront cover applications, cut out cover to correctescutcheon dimensions (see Figure 2-6 ).

!

If not already installed, mount terminals as shown inFigure 2-1 (100 Percent Rating Figure 2-2 ). To do this,the terminal cover screws must first be loosened andthe terminal covers removed. (See Figure 2-3a for

Figure 2-7 Breaker Mounting Bolt Drilling Plan - 1600 ARear Connect Circuit Breaker.

Figure 2-8 Mounting Plate Installation - 1600 A RearConnect Circuit Breaker.

1600 A Front Connect).

WARNING

Figure 2-9 Securement of Cable (See Caution Note for

Bracing Instruction).

a. Remove the line and load end covers.

1600 A Rear Connect Circuit Breaker

800 A,1200 A,1250 A, and 1600 A Front Connect2.3 Terminal Installation

100 Percent Rated N-Frame(1200 A breaker only):Connect the supplied line and load conductor exten-sions as shown in Figure 2-2 . For a four pole breaker do not connect the conductor extensions to theneutral pole.


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Wrap conductor cable cables with 3/8 nylon or equiva-lent rope as shown in Figure 2-9 , having a minimum ten-sile strength of 2000 lbs., at 6 from terminals and everyadditional 6 with 5 wraps or every additional 1 with1 wrap.

Note: Steps 2.6 and 2.7 are not required for themolded case switch.

Figure 2-10 Rating Plug.

HAZARDOUS VOLTAGE CONDITIONS CAN CAUSEDEATH OR SEVERE PERSONAL INJURY. MAINTAINORIGINAL ELECTRICAL CLEARANCE AND CREEP-AGE SPACINGS AT TERMINATIONS.

After the circuit breaker is installed and all connectionsare made, check all mounting hardware and terminalconnection hardware for torque loading. Torque valuesfor line/load terminal lugs are given on table in Figure2-1 . Torque mounting screws to 30-35 lb-ft., (41-47 Nm).

Re-install load end and line end covers and secure withpan head screws provided. Torque large screws to 35-45 lb.-in. (4.0-5.0 Nm) and small screws to 24-30 lb-in.(2.7-3.4 Nm). When using the terminals TA700NB1 or T700NB1, or when prospective fault currents of cabledinstallations exceed 65kA, (such as NDC applications),the conductors are to be braced in accordance withFigure 2-9 .

UNSUPPORTED CABLES CAN CAUSE MINORPERSONAL INJURY OR EQUIPMENT DAMAGEUNDER SHORT CIRCUIT CONDITIONS.

! CAUTION

! CAUTION

b. If the circuit breaker includes factory or field installed inter-nal accessories, make sure the accessory wiring can bereached when the circuit breaker is mounted.

Note: Labels with accessory connection schematicdiagrams are provided on the side of the circuit breaker.A note should be made of the diagrams if the labels can-

not be seen when the circuit breaker is mounted.c. Position the circuit breaker on the mounting surface.

d. Secure the circuit breaker with the supplied hardware.

1600 A Rear Connect Circuit Breaker

MOUNT THE 1600 A CIRCUIT BREAKER ON THE PRO-VIDED INSULATED SURFACES TO ENSURE MINIMUMCLEARANCE DISTANCE TO GROUND.

a. For individual surface mounting, drill the mounting panelusing the drilling plan shown in Figure 2-7. For dead frontcover applications, cut out cover to correct escutcheondimensions (see Figure 2-6 ).

b. Attach the insulating Mounting Plates to the Line and Loadsides of the circuit breaker as shown in Figure 2-8 with theM8 x 1.25 x 60 mm Pan Screw and hardware supplied withthe Mounting Plate.

c. If the circuit breaker includes factory or field installed inter-nal accessories, make sure the accessory wiring can bereached when the circuit breaker is mounted.

Note: Labels with accessory connection schematic dia-

grams are provided on the side of the circuit breaker. Anote should be made of the diagrams if the labels cannotbe seen when the circuit breaker is mounted.

d. Position the circuit breaker on the mounting surface.

e. Secure the circuit breaker with the supplied hardware. Usethe M8 x 1.25 x 45 mm Pan Screw and hardware suppliedwith the Mounting Plate.

2.5 Connecting Line and Load Conductors

OVERHEATING CAN CAUSE NUISANCE TRIPPING ANDDAMAGE TO THE CIRCUIT BREAKER. WHEN ALU-MINUM CONDUCTORS ARE USED, THE APPLICATIONOF A SUITABLE JOINT COMPOUND IS RECOMMEND-ED TO REDUCE THE POSSIBILITY OF TERMINALOVERHEATING.

Connect line and load conductors and accessory leads. If thecircuit breaker includes ground fault protection, connect the

! CAUTION

! WARNING

neutral current sensor and ground fault alarm unit asdescribed in section 5 and as shown in Figure 5-2.


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e. Place a flat blade screwdriver in the slot on thePush-to-Trip button. Press approximately 1/16 inchand turn button 90 o clockwise.

f. If an adjustable rating plug is installed, four continuouscurrent settings are possible. Set the switch marked A,B, C, D to the current rating desired.

The circuit breaker is now ready for operation.

Note: The reverse procedure is used to remove therating plug. Turn the Push-to-Trip button to theremove position. This action will cause the circuitbreaker to trip. Then grasp the lip of the Push-to-Trip button and gently pull. A small screwdriver placed under the left edge of the Push-to-Trip buttonwill assist in removal.

3. OPERATION

3.1 Manual Operation

Manual operation of the circuit breaker is controlled bythe circuit breaker handle and the Push-to-Trip button.The circuit breaker handle has three positions, two of which are shown on the cover raised lettering to indicateON and OFF. On the handle, ON, OFF, and TRIP arealso shown by a color-coded strip for each circuit break-er handle position: red for ON, white for TRIP, andgreen for OFF (see Figure 3-1 ). The Push-to-Trip buttonchecks the circuit breaker tripping function and may beused to periodically exercise the operating mechanism.The button, located in the rating plug, is designed to beoperated by finger pressure.

3.2 Circuit Breaker Reset

After an automatic or accessory initiated trip, or amanual Push-to-Trip operation, the circuit breaker isreset by moving the circuit breaker handle to theextreme OFF position.

2.6. Adjusting Trip Settings

The N-frame Series C circuit breakers have the trip unitbuilt in as an integral part of the breaker. The trip unit isnot field replaceable. The various trip unit settings aredescribed in Section 4. They should be adjusted asrequired at this point.

2.7 Rating Plug Installation

The circuit breaker requires the installation of a ratingplug to make it operational. The installed rating plugestablishes the maximum continuous current rating (I n)of the circuit breaker. A typical rating plug is shown inFigure 2-10 . Available rating plugs are listed in Table1.2 . To install the rating plug perform the followingsteps.

Note: Before attempting to install the rating plug,the arrow in the Push-to-Trip button portion of theplug must be pointed toward the REMOVE position.This can be done with a small screwdriver.

a. Position the rating plug as shown in Figure 2-11 .

b. Make sure the arrow on the rating plug Push-to-Tripbutton is pointing at REMOVE. Adjust, if necessary,using a flat blade screwdriver.

c. The projections on the rating plug shaft must line upwith the matching slot in the trip unit and the contactpins must match with the sockets in the PC board.

d. Push the rating plug in as far as it will go. The electri-cal contact pins will enter matching holes in the trip unit.

Figure 2-11 Rating Plug Installation.


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LACK OF ILLUMINATION OF THE STATUS LIGHTDOES NOT INDICATE THE TERMINALS OF THEBREAKER ARE DEENERGIZED.

4. NES DIGITRIP 310 TRIP UNIT ADJUSTMENTS

4.1 Ampere Rating

The installed rating plug establishes the maximum con-tinuous current rating (I n) of the circuit breaker. A typicalrating plug is shown in Figure 2-10 . Available ratingplugs are listed in Table 1.2 .

An optional adjustable rating plug provides four amperesetting selections in a single rating plug. Figure 4-1

shows time/current curve details for adjustable ratingplug Cat. No. A12NES1200T1. Time/Current Curves for other adjustable rating plugs are similar.

A green status light indicates the operational status of the trip unit. If the load current through the circuit break-er exceeds approximately 200 Amps the status light willblink on and off once each second. A blinking statuslight is an indication of a properly functioning trip unit. If the status light is not blinking, the current through thebreaker may be less than 200 Amps. If the currentexceeds 200 Amps and the status light is not blinking,use the STK2 test kit to investigate (see Section 6.8).

! CAUTION

Figure 3-1 Circuit Breaker Manual Controls.

4.2 Long Time Pick Up and Delay

Neither the long time pick up or the long time delay areadjustable. The long time pick up (the current at or above which the circuit breaker will trip) occurs between1.05 and 1.25 times I n. If the status light is on steady, it

indicates a trip is pending. The long delay time normallyhas the characteristics t=360 / (I n)

2 + 20%. For example,

at I n=6 per unit, t=10 seconds + 20%. There is however,

a memory effect that can act to shorten the long delay.The memory effect comes into play if a current abovethe long delay pick up value exists for a time and then iscleared by the tripping of a down stream device or thecircuit breaker itself. A subsequent overload will causethe circuit breaker to trip in shorter time than normal.The amount of time delay reduction is inverse to theamount of time that has elapsed since the previousoverload. Approximately five minutes is required

between overloads to completely reset the memory.

4.3 Time and Pick-up Adjustments

One to four adjustment settings are available dependingon the particular breaker purchased. An eight-positionrotary switch is provided for each. The rotary switchesare adjusted using a small flat blade screwdriver. If theswitch is turned to a setting not marked on the trip unitnameplate, the trip unit defaults to the minimum setting.

The available settings along with the effect of changingeach setting are illustrated in Figures 4-2 and 4-3.

4.4. Short Delay Pick-up Setting

Seven settings are available that range from 2 to 8times (I n) as shown in Figures 4-2 to 4-3.

4.5 Short Delay Time Setting

Four settings (I, 100, 200, 300 milliseconds) are avail-able on trip units designated T32 and T36 (see Figure4-3 ). The I setting gives a trip response with no inten-tional delay (Instantaneous).


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4.6 Ground Fault Pick-up Setting

Six settings marked 1x through 6x I G (where I G=200

Amps are available (see Figure 4-4 ).

Note: These ampere values are always the same nomatter what rating plug is installed in the circuitbreaker.

4.7 Ground Fault Time Settings

Four flat settings (I, 150, 300, 500 milliseconds) areavailable (see Figure 4-4 ). The I setting gives a tripresponse with no intentional delay (Instantaneous).

5. GROUND FAULT CIRCUIT BREAKERS

BREAKER TRIP UNIT CAN BE DAMAGED BYHIPOTTING OR APPLYING EXTERNAL POWER TOANY COMBINATION OF THE YELLOW, GREEN,GRAY, OR WHITE LEADS. DAMAGE TO THE TRIPUNIT MAY LEAD TO DEATH, SERIOUS PERSONALINJURY, OR PROPERTY DAMAGE. MAKE CONNEC-TIONS TO THESE LEADS ONLY AS DIRECTED BYTHIS INSTRUCTION LEAFLET.

Ground Fault circuit breakers are supplied from the fac-tory with one auxiliary switch with pigtail leads (red, blue,and black wires) and pigtail lead connections for a neu-tral current sensor (white and grey wires) and a groundfault alarm relay (yellow and green) wires, all installed inthe right pole of the trip unit. A neutral current sensor isprovided with each trip unit. The ground fault alarm relayis ordered and shipped separately if required (Cat.#GFAU).

! WARNING

Figure 4-1 Optional Adjustable Rating Plug.

Figure 4-2 Short Trip Current Adjustment and CurveDetails for T33 and T35 Type Trip Units.


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Figure 5-1 Neutral Sensor Outline.

PolarityMarkings

2.188(55.58)

2.75(69.85)

M12-1.75 Tapped Holes4-Places

3 . 1

2

( 7 9

. 2 5 )

1 . 6

9

( 4 2

. 9 3 )

5.80(147.32)

4.375(111.13)

.59(14.98)

2 . 7

5

( 6 9

. 8 5 )

1 . 0

6 2

( 2 6

. 9 7 )

Figure 4-4 Ground Fault Trip Unit Current, and GroundFault Trip Time Adjustment and CurveDetails.

Figure 4-3 Short Delay Trip Current and Short DelayTrip Time Adjustment and Curve Details forT32 and T36 Type Trip Units.

. 5 0

( 1 2

. 7 )


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SOME COMMERCIAL CLEANING AGENTS WILLDAMAGE THE NAMEPLATES OR MOLDED PARTS.MAKE SURE THAT CLEANING AGENTS OR SOL-VENTS USED TO CLEAN THE CIRCUIT BREAKERARE SUITABLE FOR THE JOB.

6.1 Remove dust, dirt, soil, grease, or moisture from thesurface of the circuit breaker using a lint-free dry cloth,brush, or vacuum cleaner. Do not blow debris into thecircuit breaker. If contamination is found, look for thesource and eliminate the problem.

6.2 Switch circuit breaker to ON and OFF several timesto be sure that the mechanical linkages are free and donot bind. If mechanical linkages are not free, replace cir-cuit breaker.

6.3 With the circuit breaker in the ON position, press thePush-to-Trip button to mechanically trip the circuitbreaker. Trip, reset, and switch circuit breaker ON sev-eral times. If mechanism does not reset each time thecircuit breaker is tripped, replace the circuit breaker.

6.4 Check base, cover, and operating handle for cracks,chipping, and discoloration. Circuit breakers should bereplaced if cracks or severe discoloration is found.

6.5 Check terminals and connectors for looseness or signs of overheating. Overheating will show as discol-oration, melting, or blistering of conductor insulation, or as pitting or melting of conductor surface due to arcing.If there is no evidence of overheating or looseness, donot disturb or tighten the connections. If there is evi-dence of overheating, terminations should be cleaned or replaced. Before re-energizing the circuit breaker, allterminations and cable should be refurbished to thesame condition as when originally installed.

6.6 Check circuit breaker mounting hardware andtighten if necessary.

6.7 Check area where circuit breaker is installed for anysafety hazards, including personal safety and fire haz-ards. Exposure to certain types of chemicals can causedeterioration of electrical connections.

6.8 The operation of circuit breakers with Seltronic tripunits can be field tested using the Seltronic test kit, Cat.No. STK2 (see frame Book 29-106).

7. PERFORMANCE TESTING FOR GROUND FAULTCIRCUIT BREAKERS

7.1 Code Requirements

The National Electric Code under Article 230-95-Crequires that any ground-fault protection system beperformance tested when first installed. The testshall be conducted in accordance with approvedinstructions provided with the equipment. A writtenrecord of this test shall be made and shall be avail-able to the authority having inspection jurisdiction.

7.2 Standards Requirements

As a follow-up to the basic performance requirementsstipulated by the N.E.C. as stated above in 7.1, ULStandard No. 1053 requires that certain minimuminstructions must accompany each ground fault protec-tion system. These following statements plus a copy of

the test record form illustrated in Figure 7-2 are shippedwith each N-frame ground fault circuit breaker.

7.3 General Test Instructions

7.3.1 The interconnected system shall be evaluated inaccordance with the equipment assemblers detailinstruction by qualified personnel.

7.3.2 The polarity of the neutral sensor connection (if used) must agree with equipment assemblers detailedinstructions to avoid improper operations followingapparently correct simulated test operations. Where aquestion exists, consult the specifying engineer and/or

equipment assembler.7.3.3 The grounding points of the system shall be veri-fied to determine that ground paths do not exist thatwould bypass the sensors. High-voltage testers andresistance bridges may be used.

THERE IS A HAZARD OF ELECTRICAL SHOCK ORBURN WHENEVER WORKING IN OR AROUNDELECTRICAL EQUIPMENT. ALWAYS TURN OFF

POWER SUPPLYING BREAKER BEFORE CON-DUCTING TESTS.

Note: Since the ground fault circuit breakers derivetheir operating power from the phase current, andnot from the neutral current, passing currentthrough the neutral sensor only will not properlytest the ground fault feature.

! WARNING

! WARNING


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7.3.4 Using a low voltage (0-24V), high current, ACsource, apply a test current of 125% of the ground faultpick-up setting through one phase of the circuit breaker,as shown in Figure 7-1a . This should cause the breaker to trip in less than 1 second, and if an alarm indicator issupplied, it should operate. Reset the breaker and the

alarm indicator. Repeat the test on the other twophases.

7.3.5 If the system is a 4-wire system with a neutral cur-rent sensor, apply the same current as described inparagraph 7.3.4 above through one phase of the break-er, returning through the neutral sensor, as shown inFigure 7-1b . The breaker should not trip, and the alarmindicator, if supplied, should not operate. Repeat thetest on the other two phases.

7.3.6 If the system is a 3-wire system with no neutralcurrent sensor, apply the same current as described in

paragraph 7.3.4 above through any two phases of thebreaker, with the connections exactly shown in Figure7-1c . The breaker should not trip, and the alarm indica-tor, if supplied, should not operate.

Repeat the test using the other two combinations of breaker phases.

FIELD TESTING SHOULD BE USED FOR FUNCTIONAL

TESTING AND NOT FIELD CALIBRATION.

ANY TEMPORARY CONNECTION MADE FOR THEPURPOSE OF CONDUCTING TESTS SHOULD BERESTORED TO PROPER OPERATING CONDITIONS

BEFORE RETURNING THE BREAKER TO SERVICE.

7.3.7 The results of the test are to be recorded on thetest form provided with the equipment.

Figure 7-1b Connections for Ground Fault No-Trip Test witha Four Wire System.

Figure 7-1c Connections for Ground Fault No-Trip Test witha Three-Wire System.

Source

LowVoltageSource

L C R

Current LimitingResistor (if required)

Figure 7-1a Connections for GroundFault Trip Test.

Source

LowVoltageSource

L C R N

Load Current LimitingResistor (if required)

! CAUTION

Source

LowVoltageSource

L C R N

LoadCurrent LimitingResistor (if required)


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GROUND FAULT TEST RECORD FORM

Ground Fault Test Records Should be Retained by Those in Charge of the Buildings ElectricalInstallation in Order to be Available to the Authority Having Jurisdiction.

Test DateCircuit

Breaker Number

Tested ByResults

Figure 7-2 Typical Performance Test Record.


18/2018




Notes:


19/20




Notes:


20/20

Eaton CorporationElectrical Sector1111 Superior Ave.Cleveland, OH 44114United States877-ETN-CARE (877-386-2273)Eaton.com

2011 Eaton CorporationAll Rights ReservedPrinted in USAPublication No. IL01209003E / TBG000747Part No. IL01209003EH03

Eaton is a registered trademark of EatonCorporation.

All other trademarks are property of their



The instructions for installation, testing, maintenance, or repairherein are provided for the use of the product in general commercialapplications and may not be appropriate for use in nuclear applica-tions. Additional instructions may be available upon specific requestto replace, amend, or supplement these instructions to qualify themfor use with the product in safety-related applications in a nuclearfacility.

This Instruction Booklet is published solely for information purposesand should not be considered all-inclusive. If further information isrequired, you should consult an authorized Eaton sales representa-tive.

The sale of the product shown in this literature is subject to theterms and conditions outlined in appropriate Eaton selling policiesor other contractual agreement between the parties. This literatureis not intended to and does not enlarge or add to any such contract.The sole source governing the rights and remedies of any purchaserof this equipment is the contract between the purchaser and Eaton.

NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDINGWARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE ORMERCHANTABILITY, OR WARRANTIES ARISING FROM COURSEOF DEALING OR USAGE OF TRADE, ARE MADE REGARDINGTHE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONSCONTAINED HEREIN.

In no event will Eaton be responsible to the purchaser or user incontract, in tort (including negligence), strict liability or otherwisefor any special, indirect, incidental or consequential damage or losswhatsoever, including but not limited to damage or loss of use ofequipment, plant or power system, cost of capital, loss of power,additional expenses in the use of existing power facilities, or claimsagainst the purchaser or user by its customers resulting from theuse of the information, recommendations and description containedherein.

il01209003e - series c n-frame circuit breaker and molded case switches

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