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TYPE AKD-6LOW VOLTAGE SWITCHGEAR

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G E N E R A L */JR E L E C T R I Cv

GEK-7210 T ,Low Voltage SwitchgearjA

CONTENTSK) Breaker Insertion and Removal

Breaker Operation . ,

y INTRODUCTION 16, 17222RECEIVING, HANDLING, STORAGE

ReceivingHandlingRemoving Shipping Skid

Indoor Equipment Only

22 TESTING AND INSPECTION 22 ,4

RACKOUT MECHANISM OPERATION 244

KEY INTERLOCKSFor Breakers . . . .For Fuse Rollouts

26Storage 526DESCRIPTION

Front EnclosureBreaker CompartmentsBus CompartmentFeeder Cable and Busway CompartmentGround BusOutdoor Equipment

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EQUIPMENT INSTALLATIONPrior to InstallationLocationFoundation RequirementsAnchoring . . . . . .Assembly of Equipment

6 2766, 7 DOOR INTERLOCKS 28

88

RACKOUT MECHANISMPADLOCK DEVICES

9309

MAINTENANCEBreaker and Instrument Compartments ,

Bus CompartmentFeeder Cable and Busway CompartmentOverall SwitchgearPaint Refinishing

10 3010 3010 3110 3111 3112 31

INTRODUCTION RECEIVING, HANDLING AND STORAGE

This book contains instructions for installing, operatingand maintaining AKD-6 Low Voltage Switchgear. It shouldbe read carefully before installation and initial operation.

RECEIVING

Every package leaving the factory is plainly marked withcase number, requisition number and customer’s ordernumber. If the equipment has been split for shipment, theunit numbers of the equipment enclosed in each shippingpackage are identified.

For application and specification information, refer toBulletin GEA-10279.

Separate publications will be supplied for breakers, re-lays or other devices not described in this manual. All equipment leaving the factory is carefully inspected

and packed by personnel experienced in the proper handlingand packing of electrical equipment. Upon receipt of anyapparatus, make an inspection immediately for damagesustained while en route.

In addition to instruction books, the following drawingswill be supplied:

Front View and Floor Plan drawings. These showthe general arrangement, height, recommended aislespace, etc.Summary of switchgear equipment. This is a partialparts list, giving catalog numbers of all breakers, de-vices, etc.Electrical diagrams (when required).

1.Air circuit breakers are shipped separately in individual

cartons with the breaker in the open position. Circuitbreakers should be unpacked and inspected as soon aspossible after they have been received.

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2.

Be sure to inspect devices mounted in compartments in-side the hinged doors.3.

iAll of these documents are needed for installation, op-eration and maintenance &f the equipment. They will befound in a packet inside the auxiliary unit, or in one of theinstrument or breaker compartments.

If damage is evident, or indication of rough handlingis visible, file a claim for damage at once with the trans-portation company. Notify the General Electric CompanySales Office promptly. Information on damaged parts, partnumber, case number, requisition number, etc., should ac-company the claim.

These Instructions do not purport to cover aft details or variations in equipment nor to provide for every possible con*

tingency to be met In connection with installation, operation or maintenance. Should further information be desired orshould particular problems arise which are not covered su/fic/ent/y for the purchaser's purposes, the matter should bereferred to the General Blectric Company.

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Low Voltage Switchgear,GEK-72101f'

which they are stored.Large items (such as hoist dollies and hoist carriages

used with indoor equipment) will always be shipped inseparate crates or cartons.

To avoid the loss of small parts when unpacking, thecontents of each case should be carefully checked againstthe packing list before discarding the packing material.

The contents of each shipping package are listed on theMaster Packing List, This list indicates the number of thecase in which miscellaneous parts needed to install andoperate the equipment (such as contact lubricant, touch-uppaint, breaker closing devices, etc,) are located. If suchitems are packed in a switchgear unit Instead of a separatecrate, the list will indicate the appropriate unit number in

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REARFRONT2, « >§ VNOT FURNISHED

WITH EQUIPMENT

JACK HERETIE CABLEA !

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SIDE VIEWFRONT VIEW

RECOMMENDED METHOD OF JACKINGAFTER SHIPPING SKIDS ARE REMOVEDROLLERS MAY BE USED TO ROLLEQUIPMENT PARALLEL TO FRONT ONLY

LIFTING 8PREADERS MUST BEUSED AND TOP COVERS MUSTBE IN PLACE WHEN LIFTINGEQUIPMENT \

12) ANGLES 4" X 3" X X* THK,FRONT AND REAR)

NOT FURNISHED WLIFTINGPLATEITH

EQUIPMENT

NOT FURNISHEDWITH EQUIPMENT

HOIST RAIL (FRONT ONLY)WHEN FURNISHED

I FRONT CHANNEL1i

lFRONTZJ I

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VIEW A-AENLARGEDTIMBER

IFRONT

RECOMMENDED METHOD OF LIFTING

) FIG. 1 (0673D0500-265) Methods of Handling Indoor Equipment

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GEK-72101, Low Voltage Switchgear5'

bolt holes used for final installation. The bolts in the rearof the equipment may be reached by opening the rear doors,To reach the bolts in the front, the inner housing in thebottom breaker compartment must be brought out to thedisconnected position, Fig. 3 shows the front bolt locations,and the drawout procedure is explained on Pages 16 and 17.

HANDLING.c

The switchgear units are best handled by crane. Remov-able lugs are provided on top of the indoor switchgear.When using a crane for lifting, a cable spreader must beused to obtain a vertical pull on the lifting lugs. Recom-mended lifting method is shown in Figure 1.

CAUTION: IF THE SKID HAS BEEN RE-MOVED, BE SURE THE ROLLERS USEDARE SPACED SO THAT THE THREE CHAN -NELS REST ON TOP OF THE ROLLERS , ADIRECT APPLICATION OF THE ROLLERSBETWEEN THE CHANNELS MAY TEAR ORDISTORT THE EQUIPMENT.

If practical, the shipping skid should be left on theequipment until it is at or near its final location.

If crane facilities are not available, the equipment maybe moved into position by means of construction rollersplaced under the shipping skid, Where overhead clearanceis insufficient, the shipping skid may be removed and theequipment moved by rollers placed under the three channelsunder the equipment.

4Jacks may also be used to handle the equipment when a

crane is not available. See Figures I and 2.i

The skid is bolted to the equipment through the anchor/

NOT FURNISHEDWITH 6WGR,

Sf ^APER r I. 0 • >& TIMBER

FRONT

4) 3* • V 9 9 99REAR

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SIDE VIEWFRONT VIEW

RECOMMENDED METHOD OF LIFTING' VK i

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JACKING TIMBERNOT FURNI8IIEDWITH SWGR.

REAR ORFRONT

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FT-JACK MEREi:CABLE

PARTIAL BIDE VIEWFOR JACKINGPARTIAL

FRONT OR REAR VIEWFOR JACKING. «

RECOMMENDED METHOD OF JACKING

IFIG. 2 (0673D0500-266) Methods of Handling Outdoor Equipment

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* tow Vo//age Switchgear,GEK-72101£

move the shipping members at this time.Methods of handling outdoor switchgear, shown in Fig-ure 2, are much the same as for indoor equipments exceptthat lifting plates are provided at the base of the structure.The lifting plates should be removed after the equipmentis permanently anchored so that passageway at the endsof the equipment will not be obstructed.

f, \If it is necessary to store the equipment for any length

of time, the following precautions should be taken to pre-vent corrosion or deterioration.1. Uncrate the equipment Check thoroughly for damage.2. Store in a clean, dry, rodent free location with moderate

temperature and provide protective coverings' to pre-vent dirt, water, or other foreign substances from enter-ing the switchgear.

3. If dampness or condensation may be encountered inthe storage location, heaters must be placed inside theunits to prevent moisture damage. Approximately 250watts of heat in each unit is required. On outdoorswitchgear this may be accomplished by making atemporary power supply connection to the heaters al-ready installed in the equipment.CAUTION: REMOVE ALL CARTONS ANDOTHER MISCELLANEOUS PACKING MA-TERIAL FROM INSIDE THE UNITS BEFOREENERGIZING ANY HEATERS.

Store the circuit breakers in a clean, dry location in anupright position, They must be properly supported to pre-vent bending of the studs or damage to any of the breakerparts. Do not remove any protective grease until they areready to be installed, A covering of kraft or other non-absorbent paper will prevent dust from settling on thebreakers.iSTORAGE

If breakers are not to be placed in service at once, removethem from their shipping cartons and thoroughly inspectthem. If everything is in satisfactory condition, replace thebreakers in their shipping cartons for storage. Do not re-

£ 7 IIIONTROL

WIREWAY.II

FULLHE 6 HT

BREAKER ORINSTRUMENTCOMPARTMENT

BUSCOMPART-MENT. WIRE

TROUGHWHENREQUIRED.1Am•

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epf 1V4 -I3 HARDWAREFOR ANCHORING Sf CABLE CABLE OF

BUSWAYCOMPART-MENT.

/ BREAKERCOMPARTMENT

l.j. FLOOR PLATE? V

t PT.itt Ba X w! (OPTIONALI V Ni L\TYPICAL BOTTOM BREAKERCOMPARTMENT SHOWN WITHINNER HOUSING MOVEO TO THEDISCONNECTED P08ITI0N FORREMOVAL OF SKID D0LT8 ORINSERTION OF ANCHOR BOLTS

l B ISOLATIN' 5BARRIERMAIN aTIEUNITS LOAD STU(OPTIONAL) "C"

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iBREAKER

COMPARTMENT. POSITIONi

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FIG. 4 (0148A5073-0) Side View showing CompartmentatlonFIG, 3 (0673D0500-265) Location of skid bolts (and anchor bolts)in front of Indoor Equipment

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GEK-72101,Low Voltage Switchgear

LOAD CENTER UNIT SUBSTATIONAKD-6 LOW VOLTAGE SECTION

SHIPPING PACKAGEPRIMARY SECTION

- —SHIPPING PACKAGE-TRANSFORMER

SHIPPING PACKAGEBREAKERUNITS

SWITCH AUXILIARY|UNIT UNIT| 014UNIT NO'S. 001 Oil 012 013 015

COMPARTMENTIDENT^ICATION 4

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FIG. 5 (0102C5207-0) Outline of a typical Load Center UnitSubstation showing nomenclature

DESCRIPTION

General Electric AKD-6 Lovil'Voltage Switchgear isfree-standing assembly of metal-enclosed units of PowerCircuit Breakers and other auxiliary power circuit protec-tive devices. It may also be a part of a single-ended ordouble-ended Load Center Unit Substation.

FRONT ENCLOSUREa

The front enclosure of each unit is divided into in-dividual compartments. These compartments either housea power circuit breaker or are used to mount instrumentsand other protective devices and control components.

Figure 4 is an outline of a side view of a typical unitshowing compartmentation, and Figure 5 is an outline ofa typical single-ended Load Center Unit Substation illus-trating the nomenclature used for all equipment.

4BREAKER COMPARTMENTS—AK BREAKERS—MOUNTING CODE 2A, 3A, 4A, OR 5A

All of the switching and protective devices, control andmetering devices, control fuses and instrument trans-formers are mounted in the enclosure. The breaker positionsare all of the drawout type. The breakers are provided withself -coupling primary and secondary disconnecting contactsand incorporate positive and indirect interlocks to insureproper operating sequence. Each of the individual units,compartments and devices is described in the followingparagraphs.

These breakers are supported within their compartmentsby a rollout track which is part of the drawout mechanismattached to the sides of the compartment. See Figure 6.The drawout mechanism is shown in an exploded view,Figure 19, and its operation is explained in detail under“Drawout Mechanism Operation.”

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Low Voltage Switchgear , GEK-72101c

BREAKER COMPARTMENTS—AKR, AKRU,AKRTBREAKERS-MOUNT1NG CODE 3A, 4A OR 5A

rating which have duplicate wiring may be interchanged.Each breaker compartment has four positions. They are

illustrated in Figure 18 and described below.1. CONNECTED POSITION—The breaker is in operating

position, both primary and secondary contacts madeand the door closed.

2. TEST POSITION—The primary contacts are separated bya safe distance, but the secondary contacts are made.Any breaker test not involving power may be madein this position. The door may be closed in this posi-tion, and must be closed before charging the springon a manually operated AKR breaker because an opendoor will interfere with the breaker handle travel.

3. DISCONNECTED POSITION—Neither the primary nor thesecondary contacts are made, The door may be closed.

4. WITHDRAWN POSITION—The breaker is completelyout of its compartment ready for removal from theequipment. The door must be open.NOTE; ALTHOUGH THE BREAKER COM -PARTMENT DOOR MAY BE OPENED INANY POSITION , IT IS RECOMMENDED THATTHE DOOR ONLY BE OPENED WHEN THEBREAKER IS IN THE DISCONNECT ORWITHDRAWN POSITION .CAUTION; NEVER OPEN THE BREAKERDOOR WHEN THE BREAKER IS CLOSEDAND IN THE CONNECTED POSITION.

These breakers are supported on a rollout track in thesame manner as the AK breakers, However, since therackout mechanism is mounted on the breaker, there areno jackshafts in the enclosure. See Figure 7, Racking armson both sides of the breaker frame engage the drawoutmechanism pins fastened to both sides of the compartment. i

Note that extra items shown in Figures 6 and 7 (such assecondary disconnects, position switches and ground sensorsecondary disconnects) may appear in any compartmentor not be included at all, depending on the equipment spec-ified. Also note that the bracing for the primary disconnectsshown in Figure 7 may be a single piece of insulatingmaterial instead of three separate pieces,

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A stop link is located on each side of all AK breakercompartments. These links prevent an operator from manu-ally pushing a breaker set on the tracks all the way intothe compartment when the racking mechanism is in theconnected position. In a compartment made for AKRbreakers, the latches that rest on the drawout mechanismpins prevent the inner house from being manually movedall the way into the compartment when no breaker isset on the tracks.

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All AK or AKR circuit breakers of the same type and

?) SECONDARYDISCONNECTS* t

KEY INTERLOCK-STOP LINKTRACK LOCK

LINKROLLOUT TRACK

OPERATINGSHAFT

ROLLOUT- TRACK

— JACKSHAFT

INDICATORCHAIN COVERk

CURRENT*TRANSFORMER GROUND SENSORSECONDARY DISCONNECT

LH T FIG. 6 (8042645) Typical AK breaker compartment!'•V

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GEK-72101 , Low Voltage Switchgearr

SECONDARYDISCONNECTS

AMMETERSWITCHINNER HOUSE

PADLOCK DEVICE -AMMETERINDICATOR

CLOSEFUSES

STOP LINK

KEY INTERLOCK INDICATINGLIGHTS

TESTSWITCHESDRAWOUT MECHANISM

PIN

TRIPKEY INTERLOCK SLIDE FUSES

DOORINTERLOCKTRACK LOCK LINK

CURRENTTRANSFORMER LATCH

ROLLOUT TRACK

ROLLOUTTRACKGROUND SENSOR

SECONDARY DISCONNECT

POSITION SWITCHAND COVER

-.COVER REQ'D, IN FUSED' •/ -'V BRKR, COMPT. ONLY «V •

FIG. 7 (8041585) Typical AKR breaker compartment

BUS COMPARTMENT another. At shipping splits, or where connections are to bemade to other equipment during installation, provisionis made for a bolted joint. Copper buses have bolted jointsbetween each unit.The bus compartment, between, the front enclosure and

the rear cable compartment, goqj&ins all of the bus andnecessary bus supports for a particular section. This buscompartment is isolated from the breaker and instrumentcompartments by barriers. Isolation barriers between thebus and cable compartments are optional, A typical ar-rangement with an all-welded aluminum bus is shown inFigure 8. Bolts are used for supports or at connectionswhich must be made in the field. Bolted copper buses areoptional.

FEEDER CABLE AND BUSWAY COMPARTMENT

The rear cable and terminal compartment provides ade-quate room for cable installation. Straight cable runs canbe made from the bars at the load side of the feederbreakers to conduits entering above or below. Variousarrangements of single or double cable terminals are pro-vided, depending upon the purchaser’s requirements. Onetypical terminal arrangement is shown in Figure 9.

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On main breaker and tie breaker units the bus compart-ment may be divided into an upper and lower section byan optional isolation barrier. For main breakers, the uppersection contains the incoming line bus, fed from the busconnections in the auxiliary unit, while the lower sectioncontains the main bus which connects with the other units.Optional barriers at tie breakers isolate the two main bussections from each other.

An add-on unit, 18 inches deep, is available for extendingthe cable compartment of the 22 inch wide unit. The com-partment is extended when more than two busway runsfrom above or below are used, and also when the quantityof conduits leaving the unit cannot be accommodated inthe normal available space.

• Aluminum buses run continuously from one unit to

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FIG, 9 (8042651) Typical Terminal Arrangement In a 4-blgh unitFIG. 8 (8042652) Bus Compartment M

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The ground bus is bolted to the rear of . the cable com-partment near the bottom. A 4/0 connector is included oneach equipment for making the connection to the stationground. A recommended location for this connection isshown on the floor plan drawing.

Conduits for large cables should be near the rear of thecable compartment to provide space for bending thesecables as necessary.

* ‘ABeside power cable connections, some equipments in-clude an enclosed wiring trough on the left side (rear view)

of the cable compartment, providing for control circuitconnections. Terminal boards are provided in this trough

for making control wiring connections during installation,

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Where AKD-6 switchgear is shipped in more than onepackage, the ground bus must be connected at the .ship-ping splits.

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A neutral bus is provided in the cable compartment onswitchgear designed for four wire systems. It consists ofbars with plated connection areas, and is installed at eithera height of about 18 Inches from the floor or at about 6feet. In most equipments the neutral bus is insulated fromground,

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OUTDOOR EQUIPMENT

Outdoor switchgear is constructed as a basic indoorequipment completely enclosed in a weatherproof housingwith a walk-in front aisle, Figure 10. Space heaters areprovided in all outdoor equipments. There is one 115v, ac250 watt heater located in the bus compartment of eachunit. These heaters should be energized at all times toreduce condensation in the equipment.GROUND BUS

CAUTION; IT IS VERY IMPORTANT THATEQUIPMENT BE ADEQUATELY GROUNDEDFOR SAFETY ,t J"~V^k- v/;v i

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GEK-72101,Low Voltage Switchgear

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FIG, 10 (8042659) Typical Outdoor Shipping Section

iEQUIPMENT INSTALLATION

FOUNDATION REQUIREMENTSPRIOR TO INSTALLATION

Indoor Equipment—Suitable means must be provided bythe purchaser for mounting and anchoring the switchgearto the floor.

Before any installation work is performed, study alldrawings furnished by G.E. Co. for the particular installa-tion, These include arrangement drawings (front and planview), connection and elementary diagrams, installationdrawings and a summary of th^quipment. When request-

factqvy on any specific itemfurnished with the equipment, refer to the item by sum-mary and identification number wherever possible. Anymaterial external to the equipment which may be requiredto meet local codes (such as mats, screens, railings, etc.)is not furnished.

CAUTION: IF THE FOUNDATION IS SUB-JECT TO VIBRATIONS, SPECIAL MOUNTINGMUST BE PROVIDED TO PREVENT THETRANSMITTAL OF VIBRATIONS TO THEEQUIPMENT.

ing information from the

Although the equipment is furnished with built-in chan-nels so that it can be mounted directly on a smooth, levelfloor, it is recommended that recessed steel channels beinstalled by the purchaser for supporting the equipment.The floor channels under the front and rear switchgearchannels should be embedded in a level concrete slab withtheir top surfaces flush with the finished floor. It is es-sential that these steel channels be level and aligned witheach other prior to final anchoring, and that the centerswitchgear channel be supported by the finish floor to avoiddistortion of the switchgear structure. If the gear is raisedabove the floor level by the mounting channels, the centerswitchgear channel must be supported at the same level.If other equipment is installed in the same lineup, allchannels must be level and aligned with each other,

LOCATION

In locating AKD-6 switchgear, provide adequate aislespace at the front and rear of the equipment. The recom-mended aisle space is shown on the floor plan drawing,and is in accordance with N.E.C. Article 110. Local codesshould be checked for any special aisle requirements.

The equipment should be placed in an area where cleanair is free to circulate around and above it. Since air istaken into the units at the bottom and is exhausted at thetop, a location with good air flow will provide more effi-

:; j cient operation.

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Low Voltage Switchgear , GEK-72101* *

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PADFLOOR 8TEEL TO BE DRILLEDAND TAPPED (BEFORE OR AFTER

PLACE), OR WELOFINISHSURFACE —- FLOOR

CLAMPXHSTEEL IS IN INUTS MAY BE USED; 47*

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S A METHOD OF ANCHORING' 4 • 4 , "' 4*A * ' r\* * A

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a ANCHOR BOLTS, FLOOR CHANNELS ^ SHIMSBY PURCHASER—4 i '—-*

SHIMS ORGROUT

MAX.MAX.

METHOD OF ANCHORING L-l I/ .

IANCHOR BOLTS, FLOOR CHANNELS, ANDSHIMS BY PURCHASER. i

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FOUNDATION DATA • A* ’

^ INSERTA '4

• aJ.V 4 'ALTERNATE METHODS OF ANCHORING

EQUIPMENT IS FURNI8HED WITH BUILT-IN CHANNELS.EMBEODEO CHANNELS SHOULD BE 8ET LEVEL WITHEACH OTHER AND SHOULD BE LEVEL OVER THEIRENTIRE LENGTH. CENTER CHANNEL MUST BESUPPORTED, Vi THK. FORMED CHANNELS ARERECOMMENDED FOR LEVELING PURPOSES,FINISH FLOOR SHOULD HAVE SLIGHT PITCH AWAYFROM MOUNTING CHANNELS AND IN NO CASE SHOULDTHE FINISH FLOOR BE HIGHER THAN MOUNTINGCHANNELS.

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;REARFRONT

VPAO s l.vJTFINISHSURPACE^FRONT - —fc|la\ ~-ICOa.

:Jot ^SIDE VIEW OF FLOOR FRAMESHOWING BEARING SURFACE8 OFFRONT, REAR AND CENTER CMANNEL8

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' A ' ' EQUIPMENT 1$ FURNISHED WITH BUILT-IN FLOOR FRAME,EMBEODEO CHANNELS SHOULD BE SET LEVEL WITHEACH OTHER AND SHOULD BE LEVEL OVER THEIRENTIRE LENGTH , CENTER CHANNEL MUST SB 80PP0nTED.Vi THICK FORMED CHANNELS ARE RECOMMENDED FORLEVELING PURPOSES. FINISH PAD 8HOULO HAVE SLIGHTPITCH AWAY FROM MOUNTING pHANNElS AND IN NOCASE SHOULD THE FINISH PAO BE HIGHERTHAN MOUNTING CHANNELS.

A A

ALTERNATE METHOD OFANCHORING !• 1

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FIG, 12 (0673D0500-266 ) Foundation for Outdoor Equipment.Anchor bolts, floor steel and other foundation material furnished

by purchaser

FIG. 11 (0673D0500-265) Foundation for Indoor Equipment.Anchor bolts, floor stool and oilier foundation material furnished

by’puWjvaser! •

There are two methods of anchoring indoor equipmentto the channels. One is to use Vi inch anchor bolts throughthe holes provided in the bottom of the equipment asshown in the floor plan. Another is to tack weld the bottomchannels of the equipment to the foundation channels.

Recommended method of embedding channels andmounting the switchgear to the foundation is shown inFigure 11, This information is also sent to the purchaserwith other requisition drawings.

Outdoor Equipmei^J—Recommended method of embed-ding channels and mounting the switchgear to the founda-tion is shown in Figure 12. Otherwise, comments underIndoor Equipment apply. Outdoor equipment also has acenter channel in the floor frame which must be supportedby the pad or other means.

Two suggested methods for anchoring outdoor AKD-6switchgear are illustrated in Figure 12. Both use an anchorbolt and floor clamp to secure the supporting channel tothe foundation.

NOTE: DO NOT DOLT OR WELD THE EQUIP-MENT TO THE FLOOR CHANNELS UNTILTHE SHIPPING PACKAGES HAVE BEENBOLTED TOGETHER AS DESCRIBEDUNDER “ ASSEMBLY OF EQUIPMENT ”

ANCHORING

The switchgear should be mounted on top of the channelsas shown in Figures 11 and 12 and securely anchored tothem.V

11

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GEK-72101,Low Voltage Switchgear

ASSEMBLY OF EQUIPMENT be connected to the station ground. Neutral buses aremounted on molded insulators that are attached to therear upright channels. If a transformer is present in thelineup, make the necessary connections from the equipmentto the flexible connectors furnished with the transformer asshown in Figures 13 and 14. Connection hardware is sup-plied with the equipment. The ground connection bar inthe bus entrance compartment will be shipped turned In.This bar should be reassembled in the correct position andconnected at the offset portion to the transformer groundpad with a Vi inch bolt. Consult transformer instructionsfor proper connection procedure.

All bolted bus joints should be made up using the propertorque values as shown in Table A,

(Before assembly of the equipment is begun all com-

ponents should be on hand to facilitate installation. Theindividual shipping packages must be connected togetheron the foundation. If there is no transformer in the lineupand the equipment has been split for shipment, place themiddle package on the foundation first and assemble inboth directions. If the equipment is part of a Load CenterUnit Substation, the transformer section should be set onits pad in accordance with the instructions furnished withthe transformer, and then packages of equipment added,

<NOTE? WHEN AKD-6 SWITCHGEAR IS IN -STALLED IN THE SAME LINEUP WITHTRANSFORMERS AND OTHER EQUIPMENT,IT IS IMPERATIVE THAT ALL MOUNTINGSURFACES BE LEVEL,

5. Bolt or weld the equipment to the foundation asspecified under "Anchoring,”

6. All shipping supports must be removed from theswitchgear. These are painted yellow.

7. Busway runs must be lined up and connected to theequipment. Hardware for this joint is furnished with thebusway.

8. Connect control cables between units at the shippingsplits. A tag at the top of the unit adjacent to the splitwill indicate where the wires that cross the split arelocated. These wires are all tagged and should be laidacross the split and connected to the shipping split terminalblocks as indicated.

9. Connect control cables to the switchgear unit as follows ;

a. When control conduits enter the switchgear frombelow, they should not extend more than one inchabove the floor. The control cables may be pulledthrough the conduits before or after the switchgearis installed.

b. Route the control cables from the conduits throughthe wiring trough at the side of the cable compart-ment and connect the cables to the terminal blocksin accordance with the connection diagrams for theequipment.

c. If the control conduits enter from above, drill thetop cover within the available space indicated. Con-trol cables should be routed to the wiring troughand connected to the terminal blocks as above,

10. Connect the main cables to the units. Before anymain cable connections are made, the cables should beidentified to indicate their phase relationship with equip-ment. Adequate electrical and mechanical clearances mustbe provided between conduits, cables and bus. Where thecables enter the unit, they can be lashed to cable supportsat the rear of the cable compartment as required. SeeFigure 9.

Cable terminals are Included with the switchgear, andare mounted at the ends of the bars in the cable compart-ment. Check to see that the proper size and quantity ofterminals are located at each connection point, and thatthey are positioned correctly to receive cables coming fromabove or below. In all cases, carefully follow the cablemanufacturer’s recommendations for installation of cable,as well as the instructions contained in this book,

!

Proceed to assemble the equipment as follows;

1, The switchgear packages should be placed on thefoundation with the aid of cranes or jacks as shown inFigure 1 for indoor equipment or Figure 2 for outdoorequipment.

2, For Indoor Equipment, the packages should be fas-tened together at the shipping splits by bolting the frontand rear upright dhannels together. Use % - l6 hardwarefurnished with the equipment at the end of the packages.ll"a transformer is in the lineup, hardware for connecting

:) the flange to the switchgear is supplied with the equipment.3, For Outdoor Equipment, remove the lifting plates

from front and rear of the switchgear base at both ends ofthe shipping split joint and assemble the front and rearsplice plates as shown in Figure 14.

When joining shipping packages, special procedures forweather-proofing must be followed as indicated in Figure14. The joint in the roof at shipping splits must be weather-proofed. This is done as shown in Figure 14 by placing arubber seal on each side of the top edge of the roof sup-port batten so that the roof $|§tions butt up against thisseal on both sides. Bolt tills ^bint togeher, using % -16hardware, A roof cap is placed over this seam and held inplace by the roof trim. Joints between transformer throatand switchgear and between shipping splits must beweather-proofed as shown in Figure 14. Install a front andrear batten and rubber seal at the shipping split joints andbolt them together with the furnished %-16 hardware.The gasket for an outdoor transformer is furnished withthe transformer, and hardware for connecting the trans-former flange to the switchgear is supplied with the equip-ment. Check alignment of doors on the outdoor equipmentto see that the weatherproof seal has not been disturbed.

4, Bolt the main buses, ground buses, and neutral busesof adjacent shipping packages together using the splicebars furnished with the equipment. See Figure 13 and 14for details of splice bar connections. The ground bus ismounted directly on the rear upright channels. It is par-ticularly important that this bus be connected since it pro-vides an integral ground for all the equipment that should

ll:ill

. 41

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12

!ill

!

Low Voltage Switchgear , GEK-72101; .

1

12. Remove all blocking on relays and devices.13. Make a final inspection to see that there are no tools,

construction materials, or other foreign matter left in theswitchgear.

It is imperative that all cables be adequately supportedto take their weight off terminals and studs, and to prevent

movement during short circuit.Train the cables in the proper path to the terminals, using

temporary lashing If required, and cut to the proper length.Strip the insulation to the desired dimension, being carefulnot to damage any strands.

For copper cables, coat the cables with D50H47 grease,insert the cables into the terminals and tighten the setscrews in accordance with values shown in Table B.

For aluminum cables, wire brusli the cable strands• thoroughly. Immediately after wire brushing, coat the cable

strands with a quality oxide inhibiting compound such asPenetrox A, (or other similar oxide inhibiting compound).Insert cables into the terminals and tighten the set screwsin accordance with values shown jn Table B, This shouldresult in the oozing of compound from between individualstrands. Wipe off the excess compound.

Bolt the cable terminal connectors to the ends of the barsin the cable compartment. A non-oxidizing lubricant (suchas D50fcl47 furnished with each equipment) can be used atthese connection surfaces.

Lash the cables permanently to the cable supports.11. Remove the lifting brackets from the front and rear

channels. If equipment is furnished with “add-on” com-partments, brackets at the rear cannot be removed.

ii

TABLE B

TORQUE VALUES FOR CABLE TERMINALS i

Inch-Pounds

WireSize350,000400,000

Inch-Pounds

WireSize

25010062505 100

4 100500,000600,000700,000750,000

3001253 3001252 3001251 3001500 800,000

900,0001 ,000,000

40015000 h400

4002000002000000 5001,250,000

1,500,0001,750,0002,000,000

200200,000 500500250250,000

300,000 500250

TABLE ATORQUE VALUES FOR LOW VOLTAGE EQUIPMENT HARDWARE

(COPPER OR ALUMINUM)/1 ; i

!

Bolti i

Size Foot PoundsWith PrevailingTorque Locknut

Conical Spring WasherAnd Flat Washer

j

With Finished Machine NutConical SpringWasher AndFlat Washer

LockxvasherAnd

Flat WasherOr

! A Flat Washer Only* d;

W 1/4-20%-161/2-13%- H

105-7 925 3015-25

25-3535-45

4235 >. •

5545

> V i

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13

GEK-72101,Low Voltage Switchgear *

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AUXILIARY UNIT ADAPTER FORVENTILATED 2000 ANO 2500 KVATRANSFORMERS

(5) OR (3) tt -16 BOLTSWASHERS AND LOCK - AUXILIARY UNIT OR

AUXILIARY UNIT ADAPTERWASHERS DISCARD TOP COVER 2(6) OR I3) NUTS

[ 21 REAR COVERSTILT FRONT OF HOIST UP TO ASSEMBLEUVA DIA. ROLLER UNDER FLANQE OFCHANNEL, THEN LOWER FRONT ROLLERSTO RAIL.

NEUTRAL SPLICE (SEE VIEW-D)

W -16 HARDWAREFOR EACH SIDE

3

I1

TRANSFORMER FLANGE HOISTRRlVrnBOLTS HERE WHEN REMOVE COVER TO

BOLT MAIN BUSIF BARRIERS ARESUPPLIED (REPLACE)

ADAPTER BOX IS NOTREQUIRED, HOIST

Domr

REMOVE NUT, —^„1LIFTING PLATEAND SPACER. ^BOLT 6TAY9 INPLACE.

NEUTRAL SPLICE (SEE VIEWOlFRONT 3CHANNEL

73 GROUND

SPLICE3 (SEE VIEW "G”)

BUS

REMOVING LIFTINGPLATES AND SPACERS

MAIN BUSSPLICE (SEEVIEW "F'1) (SIDE SHEET

AFTER EQUIPMENT IS SET IN PLACEREMOVE (2) # 10-32 SELF-TAPSCREWS ANO LOWER BOTTOMSHIELD TO FLOOR LINE,REASSEMBLE THE (2) SELF-TAP SCREWS.

#10-32 SELF-TAP SCREWS RACK LOWER BREAKER COMPARTMENTTO DISCONNECT POSITION TO RECEIVEANCHOR BOLTSJ?-e BOTTOM SHIELD

Vi BOLT, LOCKWASHER AND1" FLAT WASHER ....

Vi BOLTS, NUTS,CONICAL ANDFLAT WASHERS

LOWERING BOTTOM SHIELDS

SPLICE BARS SPLICE BARSSPLICE BAR£ c m 33

*=4r 4 n INSULATORSvzzpnpspz2 BAR 0l)s

HARDWARE— Vi BOLTS, NUTS. CONICAL ANO FLAT WASHERSVIEW “P*

MAIN BUS SPLICE

!3 BAR BUS1 BAR BU8

REAR OF FRAMES

VIEW DNEUTRAL BUS SPLICE

1

Vi BOLTS, NUTSAND FLAT WASHERSTRANSFORMER

CONDUCTOR —.NOTES1 ALL SHIPPING SPLIT HARDWARE TO, BE

DISASSEMBLED BEFORE ADJACENT WSHIPPING PACKAGES ARE SET IN PLACE,REASSEMBLE TO SECURE SHIPPING SPLIT.

\

2 AUXILIARY UNIT OR AUXILIARY UNIT s*ADAPTER TOP COVER AND (2) REAR COVERSMUST BE REMOVED FOR CONNECTION TOTRANSFORMER.

,‘y.y AUXILIARY UNITCONDUCTOR jr Z1

(l> STAR WASHERSrfl©CONICALWASHER ©3 GROUND DUS SPLICE AND HARDWARE WILL BE

NORMALLY SHIPPED ASSEMBLED TO EITHERSIDE OF AOJACENT SHIPPING PACKAGES.NEUTRAL SPLICE, HARDWARE AND INSULATORS(WHEN FURNISHED) WILL BE NORMALLY SHIPPEDASSEMBLED TO EITHER SIDE OF ADJACENTSHIPPING PACKAGES,

=0REAR OF FRAMES

TYPICAL TRANSFORMERCONNECTION VIEW G

GROUND DUS SPLICE

FIG. 13 (067300500*265) Assembly of Indoor Equipment\ j

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14

'I

* Low Voltage Switchgear ,GEK -72101to

REMOVE SHIPPINGWIRE FROM HOISTDOLLY v REMOVE SHIPPING

I SUPPORTS (YELLOW)is.

1. TIGHTEN ALL SHIPPING SPLITHARDWARE.

H. CUT FRONT AND REAR RUDDERSEAL TO FIT.TOP AND BOTTOM AS SHOWN.

3. CEMENT TO STEEL FRAMEWITH 76V1001B6P101 |3M CEMENT #1711J

SPACER

HOISTCRANK

l1 ROOF CAP TRIM

‘BATTEN

VIEW A-AENLARGED VIEW-C(REASSEMBLE AS SHOWN)1 RUBBER GASKETRUBBER SEAL

REMOVE SHIPPING •ROOF CAPSUPPORTS(YELLOW)

APPLY 76V100195P101(3M CEMENT #1711

> HARDWAREQTY. 6 OR 7DISCARD NUTS

nREAR -> APPLY 76V100165P1O 1(3M CEMENT #1711 )ROTH SIDES OP BATTENFULL LENGTH

RURDSRSEALREMOVE '•FRONT REMOVE * (

NEUTRALINSULATORS

J REASSEMBLEr PER VIEW "H"

MI?NSEE RUBBER 2ENLARGEDVIEW C

SEAL «'inS IFBRIERS NEUTRAL 'ISPLICE

SEE VIEW VH'1 •L;

9 OR io %-ieDOLTS. WASHERS 1.04 LKW BACH !|

FLANGE

nncSUPPLIED jl(REPLACE) 0to 9o! 98IDE 9|o 9Lw ^ i

/ML iit it

ri .FRONTCBATTENTRANSFORMER FLANGE rf(N D J REAR

BATTEN°l 0REMOVE SHIPPING.. SUPPORT RELOCATESPACER PER VIEW C

It.. 1$ ;

»6

HOISTCRANK ITT i

0

i i [ j i*-t'

2 I

TRANSOPENING GROUND BUS

SPLICE SECVIEW G

PADFINISHSURFACE

MAIN BUSillfPl SPLICE SEE IVIEW “F'

SPLICE PLATETRANSFORMERCONDUCTOR

I

REMOVELIFTING PLATE

i REMOVELIFTING PLATE 4ASSEMBLE SPLICEPLATES FRONT ANDREAR

3'

§ >fcj (L AUXILIARY UNIT><Nj . 0l CONDUCTOR

APPLY 75VIOOI05P1O1(3M CEMENT # 1711)TO DOTH GASKETS

a.CONICALWASHER

ROOF CAP TRIM

ROOF CAP1) RUBBERj GASKET0. i

Va -13HARDWARE

’g MSHIPPINGSPLIT

& hXa g>TYPICAL TRANSFORMERCONNECTION

ROOFAPPLY 76V10019SP101(3M CEMENT #1711)FULL LENGTH V VzRUBBER

SEAL XSHIPPINGSPLIT t J* BATTEN OR

BARRIER.SPLICE BARS

Wfc sl#iSPLICE OAR SPLICE OARS 3c SECTION E-EAFTER ADvIACENT

PACKAGES ARE SECURE4. SHIPPINGA •V r-T "~J

)DOORSl BAR BUS 2 BAR BUS

HARDWARE Vi BOLTS. NUTS, CONICAL AND FLAT WASHERS3 OAR BUS

SECTION D-0TYPICAL. FRONT OR REAR AFTERAOJAGENT SHIPPING PACKAGESAnE SECURE,VIEW "F"MAIN BUS SPLICE

l* % BOLTS, NUTS

ANO FLATWASHERS •

MOTES1 ALL SHIPPING SPLIT HARDWARE,

BATTENS, ROOF RUBBER GASKET, ROOF CAP,FRONT AND REAR ROOF CAP TRIMTO BE DISASSEMBLED BEFORE ADJACENTSHIPPING PACKAGES ARC SET IN PLACE.REASSEMBLE TO SECURE SHIPPING SPLIT.

Vi BOLT, LOCKWASHER AND1" FLAT WASHER Vt BOLTS, NUTS,

CONICAL ANDFLAT WASHERS

42 GROUND BUS SPLICE AND HARDWARE WILL. BENORMALLY SHIPPED ASSEMBLED TO EITHERSIDE OF ADJACENT SHIPPING PACKAGES,NEUTRAL SPLICE. INSULATORS AND HARDWARE(WHEN FURNISHED)SHIPPEO ASSEMBLEADJACENT SHIPPING PACKAGES

STAR WASHERS INSULATOR\r Tii

WILL BE NORMALLYD TO EITHER SIDE OF 4CflEAR OF FRAMES REAR OF

FRAMESVIEW GGROUND BUS SPLICE VIEW H

NEUTRAL BUS SPLICE

FIG. 14 (0673D0500-266) Assembly of Outdoor Equipment5

W *

15

GEK-72101 , Low Voltage Switchgear

ASSEMBLY OF EQUIPMENT (cont.)14. Install the breaker hoist. When supplied with indoor

^ equipment, this is shipped completely assembled in a sep-arate carton. To install it, remove the lifting plates fromthe front of the equipment, Lift the hoist into position ontop of the switchgear so that the end with the single rolleris toward the rear of ,the equipment. A channel is providedon the top of the equipment which serves as the track forthe single wheel on the rear of the hoist assembly, If spaceis available at the end of the equipment, the hoist may beassembled by sliding the rear wheel under the top leg ofthe channel and then lifting the front end of the hoist overthe stop clip and positioning the front wheels so that theywill straddle the tapered front track, If space at the endsof the equipment is restricted, the angle which is bolted tothe hoist side frames immediately in front of the singlerear roller must be removed. The rear wheel can then behooked under the channel and the front wheels can bepositioned on the front track. The 1 retaining angle at therear should then be reassembled, Stop clips are providedat each end of the front track to prevent the hoist fromriding off the ends of the track,

test. Check thoroughly for any damaged or loose parts andfor any dirt or foreign matter which may be in the breaker.Be sure that a thin film of D50H47 grease is present ondisconnects before installing the breaker.

«0.--

HOISTING AND INSERTING AK BREAKERS

With the inner housing in the compartment in the CON-NECTED position, proceed as follows:

1. Put the breaker in front of the unit in which it is tobe installed. Be sure it is tripped.

2. Insert handle on jackscrew shaft located on left handside of compartment.

3. Rotate handle counter-clockwise until jackscrew isstopped, (Indicator should read DISC). Inner house is nowin the DISCONNECTED position.

4. Remove handle and open compartment door,

5. Rotate the two track lock links and pull the righttrack to the limit of its travel. See Figure 16A.

6. Pay out enough hoist cable to place the hooks in theslots on the breaker side frames. See Figure 16B.

CAUTION: DO NOT UNWIND CABLE COM -PLETELY FROM DRUM. OPERATINGCRANK MUST TURN CLOCKWISE TO HOISTTHE BREAKER, COUNTER-CLOCKWISE TOLOWER IT.

7. Place the cable eye just under the ball nearest thehoist (fourth ball from the hooks) and take the slack outof the cable with the hoist. See Figure 16C,

i

When a hoist is provided with outdoor equipment, it isshipped mounted and secured in place. The yellow ship-ping supports at either end of the hoist movable track mustbe removed as shown in Figure 14. To free the hoist dolly,remove the wire that is used to keep it in place duringshipment.

15. Before placing breakers in the equipment, check eachbreaker compartment for bolted joints in the primary dis-connect bars, Where such joints exist, check the bolts fortightness. Refer to Table A for the proper torque values,

Also check the contact areas on each primary disconnectbar or cluster of fingers for foreign matter that may haveaccumulated. Clean these areas if necessary. Be sure thata thin film of D50H47 grease covers the contact areasbefore putting a breaker in the compartment ,

! !'

I

I

WARNING: DO NOT STAND UNDER BREAKERDURING HOISTING OPERATION.

Check to see that the breakers match their respectivecompartments. Each breaker is assigned a part or marknumber. This number is shown on the breaker sheets ofthe summary, the front view drawings, the breaker name-

8. Raise the breaker until the breaker mounting pins areapproximately one inch above the tracks. See Figure 16D.

9. Pull the remaining track out to the limit of its traveland lower breaker so the breaker mounting pins drop intothe slots in the track. Remove the lifting device. See Fig-ures 16E and F.

10. Push the breaker in against the track stops. Rotatethe two track lock links to lock the breaker in place. Closethe compartment door, See Figure 16G.

11. Insert handle on jackscrew shaft and rotate clockwiseto move breaker into the compartment, Breaker is in CON-NECTED position when jackscrew can no longer be ro-tated, (Indicator should read CONNl.

M plate, ahd on the identificatiijte card on the breaker ship-ping carton. ’

\l.

To locate the breaker in the proper compartment, referto the breaker location list on the front view drawing, Findthe proper breaker by the identification card on the breakercarton, or the mark number on the breaker nameplate. Allidentical breakers will have the same mark number.

; l!

lii:%

;!!. BREAKER INSERTIONr , ,!i , ;

Before installing or operating a breaker, refer to thebreaker instruction manual for preoperation inspection and:•

16

„ Low Voltage Switchgear, GEK-72101

11, Engage the racking handle again as In Step 8, androtate the handle clockwise as far as it will go, Towardsthe end, a high force requirement will be felt as the dis-connect fingers on the breaker engage the stationary studs,A couple of turns later, and the stop will be encountered.The position indicator will now show CONN,

HOISTING AND INSERTING AKR AND AKRU BREAKERS% V-

With the inner housing in the compartment in the CON-NECTED position proceed as follows:

1, Put the breaker in front of the unit in which it is tobe installed. Be sure it is tripped,

2, Open the compartment door and remove the bolt withthe yellow head and the shipping tag from the track as-sembly. Discard the bolt and tag.

3, Pull inner house forward as far as possible. It is nowin the DISCONNECTED position,

4, Rotate the two track lock links, and pull the righttrack all the way forward. See Figure 16A.

5, These breakers require a spreader bar when hoistingthem to avoid damaging thejr arc chutes, For hoisting,there are two slots in each of the breaker’s side frames,

When hoisting the non-fused breaker, the spreader bar’shooks are positioned in the forward slots. When hoistingthe fused breaker, the hooks are positioned in the rear slots.

Pay out enough hoist cable to install one hook in thehole in the center of the spreader bar. Figure 17 shows afused breaker, spreader bar and hoist cable.

NOTE: ALL BREAKER COMPARTMENTSDESIGNED FOR FUTURE USE HAVE PRO -TECTIVE BARRIERS INSTALLED THEREIN ,SEE FIGURE 15.

BREAKER REMOVAL—AK BREAKERS

1, Trip the breaker.2, Insert handle on jackscrew shaft located on left hand

side of compartment.3, Rotate handle counter-clockwise until jackscrew is

stopped. (Indicator should read DISC),

4, Remove handle and open compartment door.5, Rotate the two track lock links and pull the breaker

all the way forward. The breaker may now be lifted fromthe tracks by the lifting device.

i

Ii;

l

l CAUTION: DO .NOT UNWIND CABLE COM -PLETELY FROM DRUM. OPERATINGCRANK MUST TURN CLOCKWISE TO HOISTTHE BREAKER; COUNTER-CLOCKWISE TOLOWER IT .

t.IX:V BREAKER REMOVAL-AKR AND AKRU BREAKERSr;

iA- 1. Trip the breaker.2. Engage the racking handle. This is done by pushing the

trip button in the breaker escutcheon, sliding the coverbelow it to the right, and inserting the handle on the jack-shaft,

3. Turn the handle counter-clockwise as far as it will go.If the breaker closing spring is fully charged, it will be dis-charged automatically a few turns before the end of theaction. (Indicator should read DISC,)

4. Remove handle and open compartment door,5. Rotate the two track lock links and pull the breaker

all the way forward, The breaker may now be lifted fromthe tracks by the lifting device.

6. Raise the breaker until the breaker mounting pins areapproximately one inch above the tracks. See Figure 16D,

£i

WARNING: DO NOT STAND UNDER BREAKERDURING HOISTING OPERATION .:•! •

7, Pull the remaining track out to the limit of its traveland lower breaker so the breaker mounting pins drop intothe slots in the track. R^’jftove the lifting device. See Fig-ures 16E and F, * *\r

CAUTION: THE TRACKS OF INNER HOUSESFOR AKR BREAKERS ARE EQUIPPED WITHPINS SO THAT BREAKERS OF AN INCOR-RECT RATING CANNOT BE SET ON THETRACKS. THIS PREVENTS INSERTION OFA LOWER RATED BREAKER IN A COM -PARTMENT , *

[

8. Engage the racking handle. This is done by pushing thetrip button in the breaker escutcheon, sliding the coverbelow it to the right, and inserting the handle on the jack-shaft,

9. Turn the handle counter-clockwise as far as it will go(if it will move in that direction) and remove the handle.

10. Push the breaker in against the track stops. Rotatethe two track lock links to lock the breaker in place, Closethe compartment door. See Figure 16G. FIG. 15 (8042650) Provision for future breaker with protective

barrierKg

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GEK-72101,lowVoltage Switchgear l

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FIG. 16 A (8035642) With Innerhouse In DISCONNECTED posi-tion, open the compartment door. Rotate the two track lock links,

Pull out right track completely:

'

FIG. 16 B (8035640) Let out Holst Cable. Place hooks In slotsVI

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FIG. 16 C (8035639) Adjust cable to balance breaker. Cable eyemust be under ball nearest the hoist

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FIG. 16D (8035637) Raise breaker until mounting pins are aboutone Inch above tracks<>

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19

GEK-72101,Low Voltage Switchgearr,

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1' FIG. 16 E (8035641) Pull left track out completelyii1

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FIG. 16 F (8035635) Lower the Breaker Into the track slots. Removethe Hoist Cable <•

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- Low Voltage Switchgear,GEK-72101 ! i

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FIG. 16G (8035636) Push the breaker In completely and rotatethe two track lock links. Close the door

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FIG. 17 (8041582) AKRU or AKR breaker and spreader on hoistcable3 .11>. ..r

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21

GEK-72101,Low Voltage Switchgear

BREAKER OPERATION NOTE: FOR FURTHER INSTRUCTIONS RE -FER TO THE INSTRUCTION BOOK FUR-NISHED WITH THE BREAKER.CLOSING MANUALLY OPERATED AK BREAKERS

Manually operated AK breakers are closed by rotatingthe closing handle counter-clockwise through approximately120 degrees, and then clockwise back to the normal handleposition. Four such complete movements of the handle arerequired to close the breaker, During the four counter-clock-wise movements and the first three clockwise movementsof the handle, the springs are charged. After approximately70 degrees travel of the fourth clockwise handle movement,the spring charged mechanism is driven over center and thebreaker closes. A charge indicator, numbered 1 to 4, viewedthrough the breaker front escutcheon, moves with eachcomplete handle movement and indicates the number ofcomplete handle movements that haye been performed.

TESTING AND INSPECTION

Although the equipment and devices have been tested atthe factory, they must be tested and inspected in the fieldbefore being placed in service. This will insure that theequipment has been properly installed, and that all connec-tions are correct.

4All bolted connections and control wire connectionsshould be checked for tightness.

WARNING: PRIMARY EQUIPMENT MUSTBE COMPLETELY DE-ENERGIZED WHILETESTS ON CONTROL CIRCUITS, ETC. AREBEING CONDUCTED. BE SURE THAT ALLAREAS OF FEEDBACK FROM SECONDARYCIRCUITS AS WELL AS OUTSIDE SOURCESARE DISCONNECTED.

CLOSING MANUALLY OPERATED AKR BREAKERS

Manually operated AKR breakers are equipped with ahandle and a push button marked CLOSE on the front ofthe escutcheon. The closing spring must be charged first.A complete charge is accomplished by either rotating thehandle counter-clockwise through about 135 degrees andthen clockwise back to the normal position or by usingthree similar cycles of about 50 degrees each. The chargeindicator should read CHARGED at this point. Now thebreaker can be closed by pushing the CLOSE button.

Directions for testing relays, instruments and meters aregiven in the instruction book furnished for each device.The settings of protective relays must be coordinated withother relays on the system and therefore these relay settingsmust be made by the purchaser. General instructions onsetting the relays are given in the Relay Instruction Book. 4)

CLOSING ELECTRICALLY OPERATED AK ORAKR BREAKERS NOTE: ALL BREAKERS ARE SHIPPED WITH

THE TRIP DEVICES SET AT THE MINIMUMLEVEL. BEFORE ENERGIZING THE EQUIP-MENT, CHECK TO SEE THAT ALL TRIPDEVICES ARE SET AT THE PROPERVALUES.

Electrically operated breakers may be operated by accontrol power, or dc (normally station battery) controlpower.

They may be controlled by a pushbutton switch on thebreaker escutcheon, by a breaker,, control switch, or by arelay contact. The control switcmqr relays may be locatedin the equipment which houses thfc breaker, or may be insome remote location.

The extent of the tests on the equipment as a whole willdepend on the type and function of the equipment. Testswhich should be performed, however, include circuit breakeroperation, and switchgear metering, phasing, and groundingchecks.

High potential tests to check the integrity of the insula-tion are not necessary if the installation instructions arecarefully followed. If local codes demand this test or thepurchaser wishes to make high potential tests, the voltageshould not exceed 75% of the ANSI factory test voltage.For the power circuit the ANSI factory test voltage is twotimes switchgear rating plus 1000 volts.

MANUAL TRIPPING—AK OR AKR BREAKERS

A mechanically operated trip button, mounted on thebreaker escutcheon, operates the trip shaft to open thebreaker.

ELECTRIC TRIPPING—AK OR AKR BREAKERS CAUTION:CONTROL POWER TRANSFORMERS, ANDANY OTHER DEVICES CONNECTED TOPRIMARY CIRCUITS MUST BE DISCON -NECTED DURING HIGH POTENTIAL TESTS.

POTENTIAL TRANSFORMERS,A shunt trip device is an accessory used for electrical

tripping. A normally open auxiliary switch “a” contactopens the control circuit after the breaker opens.

22

!.-1f •,

Low Volf age Swifchgear , GEK-72101s'

breakers have a TEST position, in which the breaker pri-mary contacts are disconnected while the secondary con-tacts are still engaged. This TEST position permits completetesting of , the electrical control circuit without energizingthe primary power circuit, When the breaker is first putinto service, its control circuit must be thoroughly testedwhile in this position to make sure that all closing andtripping circuits are complete and functioning properly

KEY INTERLOCKSV

After initial installation of the switchgear equipment, allnecessary interlock keys should be inserted into the ap-propriate locks and all spare keys should be placed in thehands of a responsible person. Refer to the key interlockschematic included in the summary furnished with theequipment to determine the sequence of operation and thecorrect number of operating keys required. This precautionis necessary vSince improper use of spare keys will defeatthe interlocking scheme.

*i

i

The TEST position is not suitable for inspection andmaintenance of the breaker, and should therefore be usedonly for testing breaker operation.

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FIG, 18 (0121Cl 508) Side view of breaker stackvy .•

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GEK -72101,Low Voltage Switchgear

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VIEW OF WIGHT HAND SIDE.

«FIG. 19 (0625E0376) Rackout mechanism for AK breakers

RACKOUT MECHANISM OPERATIONAK BREAKERS

anism is possible. When the tube is pushed back so that itwill clear the pin, a cam surface on the interlock slide (46)engages a trip link on the side of the breaker and holds ittrip free as long as the handle is engaged or the interlocktube is in the retracted position.

There is also a stationary cam in the house which holdsthe breaker trip free as it is moved between the CON-NECTED and TEST positions. This stationary cam comesinto operation before the primary disconnects have partedand is operable whether or not the rackout handle is en-gaged. The breaker thus cannot be closed when it is be-tween the TEST and the CONNECTED positions. Fromthe TEST to the DISCONNECTED position, the breakercan be closed when the rackout handle is disengaged andthe pin in the jackscrew is aligned with the slot in the inter-lock tube so that the interlock linkage is in the resetposition.

An indicator ( 75) which is visible through an openingin the front of the door shows the position of the breaker inthe house. The TEST position is reached when the line on theindicator label marked TEST is aligned with the stationaryline on the indicator housing. In this position, the breakercan be operated when the pin (105) and the slot in theinterlock tube are aligned and the rackout handle is dis-engaged. The secondary control power disconnects are en-gaged and the primary power disconnects are open inthis position.

Part numbers in Figure 19 teler to part numbers onDrawing 0673D0500 Sheet 627 Groups 05 or 06.

TThe rackout mechanism is operated by pushing the

handle onto the end of the jackscrew shaft and rotatingthe handle. Clockwise rotation moves the breaker into thehouse and counter -clockwise rotation moves the breakerout. Approximately 17 turns of the handle will move thebreaker from the DISCONNECTED to the CONNECTEDposition. To properly engage the handle with the jackscrewshaft, the slot in the end of the handle should align with thepin through the shaft. When the pin is so aligned, thesquare hole in the handle will be engaged with the squaredrive end of the shaft.

The rackout mechanism is interlocked so that the circuitbreaker must be open before the operating handle can beinserted. When the breaker is closed, an interlock linkoperated by the breaker cross bar blocks the interlock link-age on the rackout mechanism and prevents the tube (63)from being moved back to fully expose the square shaft

•>nd. The pin (105). in the jackscrew shaft engages in a slotin the tube. This slot prevents rotation of the shaft andalso assures that the interlock linkage must be movedthrough a prescribed distance before operation of the mech-24

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FIG. 20 (75E180001) Rackout mechanism for AKR breakers

RACKOUT MECHANISM OPERATIONAKR BREAKERS

The DISCONNECTED and CONNECTED positions areindicated by the sight indicator and by the jackscrew reach-ing the end of its travel. The adjusting nuts (78) are set sothat when the CONNECTED position is reached, the pinand the interlock tube slot will be aligned and the breakercan be closed upon removal of the rackout handle. In theDISCONNECTED position, it may be necessary to rotatethe jackscrew pin to match the slot in the interlock tube,

The motion of the rackout mechanism can be reversedat any point in the cycle by reversing the direction of ro-tation of the handle.

)Part numbers in Figure 20 refer to sheet and part num-

bers in the 0673D0500 series of drawings.The rackout mechanism for AKR breakers is mounted

on the breaker itself and a description and details of thismechanism are given in Maintenance Manual GEK-7310,

The rackout mechanism is operated by pushing thehandle onto the end of the jackscrew shaft and rotatingthe handle. Clockwise rotation moves the breaker into thehouse and counter-clockwise rotation moves the breakerout. Approximately 18 turns of the handle will move thebreaker from the DISCONNECTED to the CONNECTEDposition,

The rackout mechanism is interlocked so that the circuitbreaker must be open before the operating handle can beinserted. When the breaker is closed, an interlock linkoperated by the breaker mechanism locks the sliding coverover the racking screw in the breaker escutcheon. To insertthe racking handle the trip button must be depressed, andthe sliding cover pushed to the right. When the handle isinserted the cover is held open and the breaker is in atrip free condition. As long as the handle is engaged, thebreaker remains trip free.

There is also a stationary cam in the house which holds thebreaker trip free as it is moved between the CONNECTEDand TEST positions by keeping a lever which is connectedto the breaker trip shaft in the raised position. See Figure20, part 841-01. This stationary cam comes into operationbefore the primary disconnects have parted and is operablewhether or not the rackout handle is engaged. The breaker

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EMERGENCY OPERATIONIf necessary, It is possible to remove the breaker from

the house without using the rackout mechanism. This isdone by rotating the track lock links after the breaker hasbeen tripped and pulling the breaker manually off of theprimary disconnects. ^

However, the breaker cannot be reinserted into the housefar enough to engage the primary disconnects unless thestop links (49, 50) are retracted. The stop links retractautomatically when normal racking procedures are used.

If it is necessary to insert the breaker into the housewhen the rackout mechanism is in the CONNECTED posi-tion, the stop links must be retracted and held until theinterference pin or the breaker mounting pin has passed thestop link. It is recommended that the stop link be held upwith masking tape when attempting to insert the breaker inthis manner. The inertia of the breaker can then be used toaid in pushing it onto the primary disconnects.

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GEK-72101,Low Voltage Switchgear

NOTE: THE “ EMERGENCY OPERATION”DESCRIBED FOR AK-75 / 100 BREAKERS ONPAGE 25 CANNOT BE PERFORMED FORAKR OR AKRU BREAKERS DUE TO DIF -FERENCES IN THE DRAWOUT MECH -ANISMS.

.... thus cannot be closed when it is between the TEST and*\the CONNECTED positions, From the TEST to the DIS-CONNECTED position, the breaker can be closed whenthe rackout handle is disengaged.

An indicator, 636-03, which is visible through an openingin the front of the door, shows the position of the breaker inthe house. The TEST position is reached when the lineon the indicator label marked TEST is aligned with thestationary line on the indicator housing. In this position, thebreaker can be operated when the rackout handle is disen-gaged, The secondary control power disconnects are en-gaged and the primary power disconnects are open in thisposition.

KEY INTERLOCKSKEY INTERLOCKS FOR AK BREAKERS (OPTIONAL)

Part numbers in Figure 21 refer to sheet and part num-bers in the 0673D0500 series of drawings.

The key interlock is mounted with two one-way screwsand lock washers to the left side of the inner house.The DISCONNECTED and CONNECTED positions are

indicated by the sight indicator and by the rackout mecha-nism reaching the end of its travel, The adjusting nuts onthe rackout mechanism (located on the breaker) are set tostop the rotation of the racking arms at the correct pointsat both ends of the action. The motion of the rackoutmechanism can be reversed at any point in the cycle by re-versing th^.‘direction of rotation of the handle.

CAUTION; WHEN MOUNTING AN AKR TYPEBREAKER ON THE TRACKS PRIOR TO IN -SERTION, BE SURE THAT THE INNERHOUSE IS PULLED OUT AS FAR AS POS-SIBLE TO THE DISCON NECT ED POSITIONBEFORE PULLING THE TRACKS OUT. SEE“HOISTING AND INSERTING AKR ANDAKRU BREAKERS” ON PAGE 17, IF AN AT -

The interlock system is designed so that the key may beremoved from the lock only if the breaker is tripped andthe lock bolt is extended. When the bolt is extended, thebreaker is rendered trip free only in the CONNECTED po-sition in the house.

The breaker may be operated (closed and tripped) in theTEST or DISCONNECTED positions even when thelock bolt is extended and the key removed.

The operation of the key interlock should be checkedas follows:

1. With the breaker in the CONNECTED position, man-ually trip the breaker. This then allows the interlock tripslide (622-66) to be pushed in. The preferred way to do thisis with the rackout operating handle. When the trip slide isin, the lock bolt may be extended and the key removed.The interlock slide may then be allowed to return to itsnormal reset position. The breaker will remain trip free inthe CONNECTED position until the key is returned andthe lock bolt is retracted.

2. If desired, the breaker may be moved to either theTEST or the DISCONNECTED position while the keyis removed from the lock. In these positions the breaker canbe operated for checking or maintenance.

TEMPT IS MADE TO SET A BREAKER ONTHE TRACKS AND PUSH IT INTO THE COM -PARTMENT WHILE THE INNER HOUSE ISIN THE CONNECTED P0S/770IV, IT WILLNOT GO ALL THE WAY IN BECAUSE ITWILL BE BLOCKED BY THE STOP LINKS( 634-47 IN FIGURE 20 ). AT THIS POINT THETRACK LOCK LINKS CANNOT BE ROTATEDTO THE LATCHED POSITION AND THERACKOUT MECHANISM WILL NOT FUNC-TION CORRECTLY .

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FIG, 22 {75C150021) Key Interlock for AKR breakers

KEY INTERLOCKS FOR AKR BREAKERS (OPTIONAL)The key interlock is mounted with two one-way screws

and lock washers to the left side of the inner house.The interlock system is designed so that the key may be

removed from the lock only if the breaker is tripped andthe lock bolt is extended. When the bolt is extended , thebreaker is rendered trip free only in the CONNECTED po-sition in the house.

The breaker may be operated (closed and tripped) in theTEST or DISCONNECTED positions even when the lockbolt is extended and the key removed.

The operation of the key interlock should be checkedas follows:

1. With the breaker in the.CONNECTED position, man-ually trip the breaker. ThUH.hen allows the interlock tripslide (837-06) to be pushed iriS'When the trip slide is in, thelock bolt may be extended and the key removed. Thebreaker will remain trip free in the CONNECTED positionuntil the key is returned and the lock bolt is retracted.

2. If desired, the breaker may be moved to either theTEST or the DISCONNECTED position while the keyis removed from the^lock. In these positions the breakercan be operated for checking or maintenance.

compartment door is opened. An interference angle is at-tached to the left side of this panel to prevent it frombeing swung open unless the fuse rollout is fully withdrawn.

The fuse rollout is usually located in a modified breakercompartment directly below the compartment for thebreaker with which the fuses will be used. It is put intothis compartment the same way an AK breaker is insertedinto a compartment. See Page 16.

NOTE; THE KEY LOCK BOLT IN THE FUSEROLLOUT COMPARTMENT MUST BE RE -TRACTED BEFORE THE ROLLOUT CAN BERACKED INTO THE CONNECTED POSITION .

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KEY INTERLOCKS FOR FUSE ROLLOUTS (INCLUDED)AK breakers that are used in AKD-6 switchgear cannot

be equipped with fuses as an integral part of the breakerassembly. When fuses are required with these breakers,they are mounted inside a drawout frame similar to thatused for the breaker. This assembly is known as a fuserollout element, and a typical model is shown in Figure 23.A hinged panel made of perforated steel is positioned infront of the fuses so that they cannot be reached if the3 \)

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FIG. 23 (8040045) Fuse Rollout used with AK breakers;l* *

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The operation of the key interlock system should bechecked by following the procedure outlined in the pre-ceding paragraph.

ONE WAY MOUNTING SCREWS 622-61WITH LOCKWASHERS 622-62

INNER HOUSE SIDE SHEET

10RMAL LOCK MOUNTING HOLESDOOR INTERLOCKS

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These interlocks prevent opening of the compartmentdoor when the breaker is closed.&

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DOOR INTERLOCK FOR AK BREAKERS (OPTIONAL)KEY s.s© v;LOCKLOCK BOLT,

INTERLOCKBRACKETI09C2075-25

Part numbers in Figure 25 refer to sheet and part num-bers in the 0673D0500 series of drawings,

INTERLOCK SLIDEI09C2075-31 This door interlock consists of a link (074-03) mounted

on the inner house side sheet of the breaker compartment.A combination torsion, compression spring is mounted onthe link pivot pin and biases the link in a forward direc-tion. One end of the link engages a clip on the door latch(640-02), and the other end engages with the rackout mech-anism interlock slide 627-46, When the breaker is closed,a link operated by the breaker cross bar engages in a slotin the interlock slide. This prevents the slide from movingback, and then the door handle cannot be lifted.

RIVETS -I09C2075-26

X)TRACK LOCKLINK

When the breaker is open, the interlock slide is releasedfrom the link actuated by the breaker. It can now be movedback by pushing it in. The preferred way to do this is touse the rackout handle. The door can then be unlatchedby raising the handle while the interlock slide is held in theretracted position.

,.;y . FIG, 24 (75C150022) Key interlock for Fuse Rollout compartment

There is a key interlock system required in the equip-ment to keep the fuse rollout in the CONNECTED or DIS-CONNECTED position unless the breaker associated withit is locked open. A key interlock is installed in the breakercompartment in the normal position. (See Page 26) Acompanion key interlock is installed in the fuse rolloutcompartment. Figure 24 shows the position of the interlock-ing devices in this compartment when the key lock bolt isextended. Note that the interlock slide is held forward sothat the racking wrench cannot 'be placed over the jackscrewshaft. This prevents the fuse rollout from being racked outof its compartment. Note also the interlock bracket shownin Figure 24. This holds the track lock link in the closedposition when the lock bolt is extended and prevents thefuse rollout from being pulled out of the CONNECTEDposition by rotating the track lock links.

If required, the door interlock can be defeated. A smallhole is provided in the door in front of the interlock link.By inserting a tool such as a screwdriver through this hole,the link can be pushed back until it is free of the doorlatch. With the link held in this manner, the door latch canbe raised and the door opened.

DOOR INTERLOCK FOR AKR BREAKERS (OPTIONAL)

Part numbers in Figure 26 refer to sheet and part num-bers in the 0673D0500 series of drawings.

This door interlock does not operate in conjunction withthe compartment door latch. It consists of a hook (844-04),link (844-03), spring (844-35), and bracket (844-05) allmounted on the rear of the compartment door. See Figure 26.When the door is open, the spring pulls down on the hook,and the assembly is held against the back of the door.When the door is closed with an open breaker in the com-partment, the bracket on the breaker pushes against thebottom of the link (844-03) and rotates the top of the linkaway from the door. When the door is closed and latched,the link and hook assume the positions shown in the "DoorClosed” portion of Figure 26. When the breaker is closed,the keeper swings up and under the hook, and the doorcannot be opened.

In Figure 24 the part numbers refer to sheet and partnumbers in the 0673D0500 Series of drawings except when afull drawing number is shown.

When the equipment is operating normally with thebreaker closed, the interlock key is retained in the lock inthe breaker compartment. In order to withdraw the fuserollout, the associated breaker must be tripped, the inter-lock slide pushed in, the lock bolt extended, and the keyremoved. The key is then placed in the lock in the fuserollout compartment and the lock bolt is retracted. Nowthe fuse rollout can be racked out to the DISCONNECTED

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FIG, 25 (0121Cl509) Door Interlock and Padlock device for AKbreakers

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BRACKETf 844-05/ \BREAKER

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DOOR CLOSED DOOR OPENFIG, 26 (75C150023) Door Interlock for AKR breakers

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When the door is closed with a closed breaker in the) compartment, the bracket on the breaker causes the link to

rotate away from the door. However, when the slope onthe back side - of the hook contacts the keeper, the hookwill be lifted over the top of the keeper and will againdrop into the position shown in Figure 26, thereby holdingthe door closed.

NOTE; PADLOCK SHACKLE THICKNESSESMUST BE FROM V4" TO W THE SUG-GESTED THICKNESS IS % 0" THIS APPLIESTO DEVICES FOR BOTH AK AND AKRBREAKERS.

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MAINTENANCEWhen the breaker is opened, the keeper swings down

and away from the hook, and the compartment door canbe opened. A periodic maintenance schedule must be established to

obtain the best service from the switchgear. An annualcheck and overall maintenance procedure for the switchgeardevices and all connections should be followed as a mini**

mum requirement. Equipment subject to highly repetitiveoperation may require more frequent maintenance,

If required, this door interlock can be defeated by insert-ing a small tool such as a screwdriver through the hole inthe door above the bracket. This will push the lower partof the hook toward the rear of the compartment and thetop will move up and away from* the keeper. With thehook held in this position, the door can be unlatched andopened.

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A permanent record of all maintenance work should bekept. The record should include a list of periodic checksand tests made, the date they were made, the conditionof the equipment and and any repairs or adjustments thatwere performed. Maintenance employees must follow allrecognized safety practices, such as those contained in theNational Electrical Safety Code and in company or othersafety regulations during maintenance.

RACKOUT MECHANISM PADLOCK DEVICES

These devices are arranged so that the rackout mech-anism may be padlocked in certain positions to preventunauthorized operation,

WARNING: SOLID INSULATION SURROUND-ING AN ENERGIZED CONDUCTOR ANDPOWER APPARATUS MUST NEVER BE RE -LIED UPON TO PROVIDE PROTECTION TOPERSONNEL.

'‘PADLOCK DEVICE FOR AK BREAKERS (OPTIONAL)

. ) This accessory consists of a slotted piece (622-02) whichj * *- is riveted to the inner house side sheet. The slot matches

* the slot of the extension on the interlock slide. See Fig-ure 25, When one to three padlocks are inserted into theslot in the plate, the interlock slide cannot be retracted andthe jackscrew cannot be turned. The rackout mechanismcan be locked anywhere in its travel. It is necessary toopen the compartment door in order to place the padlocksin the device, but once the locks are secured, there is nointerference with the door and the door may be opened orclosed at will.

For specific information regarding the maintenance ofdevices, such as circuit breakers, relays, meters, etc, , referto the separate instruction book furnished for each device.

BREAKER AND INSTRUMENT COMPARTMENTS

Breakers—Test and inspect all circuit breakers for properoperation as follows:

a. Operate each breaker while in the TEST positionand check all functions. This is particularly important forbreakers that normally remain in either the opened orclosed positions for long periods of time.

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PADLOCK DEVICE FOR AKR BREAKERS (OPTIONAL)

This accessory consists of two plates, each having holesfor padlock shackles. One of the plates is bolted to theunit side sheet and the other to the inner house. Theyoccupy the upper left corner of the compartment. See Fig-ure 7 for a pictorial view of the device. The holes matchwhen the inner house is in the TEST or DISCONNECTEDposition, and these are the only two positions in which therackout mechanism can be locked. Only one padlock can beused with this device. If more padlocks are required, a lock-put device is furnished. This has a single ring and provi-sions for locking the ring with six padlocks, thus perform-ing the multiple padlock function. The compartment doormust be opened to put the padlock or lockout device on,but there is no interference with the door after they have

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been placed in position.

0WARNING: PRIMARY EQUIPMENT MUSTBE COMPLETELY DEENERGIZED WHILETESTS ON CONTROL CIRCUITS, ETC, AREBEING CONDUCTED. BE SURE THAT ALLAREAS OF FEEDBACK FROM SECONDARYCIRCUITS AS WELL AS OUTSIDE SOURCESARE DISCONNECTED.

b. Remove the breakers from their compartments to aclean maintenance area. Perform the maintenance operationsuggested in the appropriate breaker maintenance manual. f

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Low Voltage Switchgear,GEK-72101

readings. Weakening of the insulation from one mainte-nance period to the next can be recognized from the re-corded readings, The readings should be taken under simi-lar conditions each time, if possible, and the record shouldinclude the temperature and humidity.

WARNING; DE-ENERGIZE EQUIPMENT COM -PLETELY BEFORE DOING MAINTENANCEWORK ON ANY DEVICES, CONNECTIONS,BU.S WORK, BREAKER OR FEEDER CABLECOMPARTMENTS. THIS INCLUDES DE -ENERGIZING ANY CONNECTIONS TO OUT -SIDE PRIMARY OR SECONDARY SOURCES,SUCH AS TRANSFORMERS,TIE LINES, ETC ,

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FEEDER CABLE AND BUSWAY COMPARTMENT

a. Inspect all main cable connections for signs of over-heating, and tighten all connections.

b. Check all bolts that hold cable terminals to the con-nection bars for tightness,

c. Check neutral bus and ground bus connection andmounting bolts for tightness.

d. Check that all secondary control wiring connectionsare tight and that all control cabling is Intact.

INSTRUMENTS, INSTRUMENT TRANSFORMERSAND RELAYS

Check and inspect all devices to see that they are func-tioning properly. Check that all electrical connections aretight, Check mounting of the device.

BREAKER COMPARTMENT INTERIORS OVERALL SWITCHGEAR

a. Thoroughly clean interior of the breaker and instru-ment compartments. Use a vacuum cleaner and clean ragsonly, Do not use steel wool or oxide papers. Blowing withcompressed air is not recommended.

b. Check indicating devices, mechanical and key inter-

a. Clean and inspect all painted surfaces and retouchwhere necessary,

b. Check to see that all anchor bolts and other struc-tural bolts are tight.

c. Check that all breaker and instrument compartmentdoor latches operate properly.

Under normal conditions, the protective relays do notoperate; therefore, it is important to check the operationof these devices regularly. Refer to the Relay InstructionBook for detailed instructions,

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c. Check primary disconnecting device contacts forsigns of abnormal wear or overheating. Discoloration of thesilvered surfaces is not ordinarily harmful, These contactsshould be cleaned only by wiping with a lint-free cloth,

Before replacing the breaker, check the alignment andwipe off the primary disconnecting device contacts. Applya thin coat of contact lubricant D50H47 to the house studsand fingers and to the primary disconnects on the breaker, PAINT REFINISHING

Indoor switchgear is finished with ANSI-61 Gray GliddenAqualure Paint, Cat. 478-E-02115, which is applied withan electrostatic spray system and is oven baked, To re-finish damaged areas, remove all loose paint, rust, scale,oil or grease, Sand any scratches smooth. Apply ANSI-61Gray Glidden Semi-gloss Tie-Cote' Lacquer, Cat. 468-E-02111, using a spray can supplied by the factory fortouch-up purposes.

Outdoor switchgear is finished with an additional coatof ANSI-61 gray paint over the baked finish. The primerfor the second coat is ANSI-61 gray Glidden Semi-glossTie-Cote Lacquer Cat. 468-E-02111 and the final coat isDiamond Vogel ANSI-61 Gray Acrylic Lacquer Cat.IC-0702. To refinish damaged areas, remove all loose paint,rust, scale, oil or grease, Sand any scratches smooth. Spraywith ANSI-61 Gray Glidden Semi-gloss Tie-Cote LacquerCat. 468-E-02111 as a prime coat, and finish coat by spray-ing with Diamond Vogel ANSI-61 Gray Acrylic LacquerCat. IC-0702, using spray cans supplied by the factory.

BUS COMPARTMENT

Before the following c|m be performed, remove the steelformed cover between untjs if such covers have been fur-nished with the equipment.

a. Inspect the buses and connections carefully forevidence of overheating or weakening of the insulatingsupports.

b. Check all connection bolts in the bus compartmentand all bus mounting and bracing bolts for tightness.

c. Wipe and vacuum clean the buses and supports.d. Check the insulation on the bars that run from the

breaker studs through the bus structure to the cable com-partment.

e. After cleaning, megger and record the resistance toground and between phases of all insulated bars, and allbuses and connections. Disconnect all control circuits beforechecking resistance. Do not use over a 1500 volt megger.Since definite limits cannot be given for satisfactory in-sulation resistance values, a record must be kept of theJ

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