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Instructions for Installationof Metal Clad SwitchgearOutdoor and Indoor Housings

Description

Purpose ............................................................................................... 3

Recommended Safety Practices ...................................................... 3

Section 1: Receiving, Storing, and Handling of Switchgear........ 31.1 Receiving ............................................................................... 31.2 Storage .................................................................................. 31.3 Handling ................................................................................. 3

Section 2: Installation of Switchgear ............................................. 4

2.1 Indoor Switchgear .................................................................. 42.2 Outdoor Aisle-Less Switchgear ............................................. 52.3 Outdoor Sheltered Aisle Switchgear ...................................... 62.4 Outdoor Common Aisle Switchgear ...................................... 6

Section 3: Internal Connections..................................................... 7

Section 4: Table of Weights .......................................................... 10

CONTENTS

Figures

1. Lifting Angles for Indoor, Outdoor Aisle-less, andOutdoor Common Aisle Switchgear ............................................ 4

2. Lifting Angles for Outdoor Sheltered Aisle................................... 43. Tie Bolt Locations ........................................................................ 4

4. End Trim Cap and End Trim for Outdoor Aisle-less Switchgear ...... .. 5

5. Front and Rear Filler Pieces Locations for OutdoorAisle-less Switchgear................................................................... 5

6. Unit and Aisle End Trim for Outdoor Sheltered AisleSwitchgear ................................................................................... 6

7. Filler Pieces and End Trim Locations for OutdoorSheltered Aisle Switchgear .......................................................... 6

8. Openings For Aisle Wall Weld Studs ........................................... 7

9. Overlap of End Trim on Outdoor Common Aisle Switchgear .......... 7

10. Internal Connections Barrier Removal ......................................... 8

11. Internal Connections Barrier Removal ......................................... 8

12. Internal Connections Barrier Removal ......................................... 8

13. Main Bus Bar Installation ............................................................. 8

14. Insulation Boots and Ground Bus Bar Locations ........................ 8

15. Assembled Switchgear ................................................................ 9

Reference Drawings

16. Parts With Brief Description and Dimensions ............................ 10

17. Parts With Brief Description and Dimensions ............................ 11

18. Outdoor Aisle-less Right Side View With DImensions ............... 11

19. Outdoor Sheltered Aisle Right Side View With Dimensions ...... 11

20. Outdoor Common Aisle Right Side View With Dimensions ....... 11

Tables

1. Bolt Tightness for Bus Connections ............................................ 9

2. Typical Weights of Switchgear ................................................... 10

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CAUTION

THE METAL-CLAD SWITCHGEAR DESCRIBED IN THIS BOOKHAS BEEN DESIGNED AND TESTED TO OPERATE WITHIN ITSNAMEPLATE RATINGS. OPERATION OUTSIDE OF THESE

RATINGS MAY CAUSE THE EQUIPMENT TO FAIL, RESULTINGIN BODILY INJURY AND PROPERTY DAMAGE.

PURPOSE

THIS INSTRUCTION BOOK HAS BEEN PREPARED TO HELPENGINEERS AND TECHNICIANS INSTALL, OPERATE, ANDMAINTAIN TYPE VAC-CLAD-W SWITCHGEAR. FOR INFORMATIONON THE APPLICATION OF THIS TYPE OF SWITCHGEAR, REFER TOTHE PERTINENT ANSI STANDARDS AND TO CUTLER-HAMMERAPPLICATION DATA 32-265.

DANGER

ALL SAFETY CODES, SAFETY STANDARDS, AND SAFETYREGULATIONS MUST BE STRICTLY ADHERED TO WHENINSTALLING, OPERATING, OR MAINTAINING THIS EQUIPMENT.

DANGER

THE ONLY PEOPLE WHO SHOULD BE ALLOWED TO INSTALL,OPERATE, OR MAINTAIN THIS EQUIPMENT ARE THOSE WHOMEET THE QUALIFICATION REQUIREMENTS DESCRIBED IN

THE NATIONAL ELECTRIC SAFETY CODE.

TO PERFORM WORK ON THIS TYPE OF EQUIPMENT, ONEMUST BE TRAINED AND EXPERIENCED IN WORKING WITHHIGH-VOLTAGE CIRCUITS. THEY SHOULD BE FAMILIAR WITHTHE CONSTRUCTION AND OPERATION OF THIS EQUIPMENTAND AWARE OF THE HAZARDS INVOLVED.

BEFORE ATTEMPTING TO DO ANY MAINTENANCE, ALWAYS BESURE TO DE-ENERGIZE BOTH THE PRIMARY AND SECONDARYCIRCUITS.

BEFORE REMOVING A BOLTED-ON COVER, FIRST MAKE SURETHAT ALL THE CIRCUITS HAVE BEEN DE-ENERGIZED.

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PURPOSE

The following instructions are to be used for the installation of indoor andoutdoor switchgear assemblies. This manual is a supplement to I.B. 32-255that contains the basic test, operation and maintenance procedures.

RECOMMENDED SAFETY PRACTICES

WARNING

ALL SAFETY CODES, SAFETY STANDARDS AND/OR REGULA-TIONS MUST BE STRICTLY OBSERVED IN THE INSTALLATION,OPERATION AND MAINTENANCE OF THIS EQUIPMENT.

The only people who should be allowed to install, operate, or maintainits equipment are those who meet the qualification requirementsdescribed in the National Electric Safety Code.

To perform work on this type of equipment, one must be trained andexperienced in working with high-voltage circuits. They should befamiliar with the construction and operation of this equipment and

aware of the hazards involved.

Before attempting to do any maintenance, always be sure tode-energize both the primary and secondary circuits.

The exposure to the elements of internal components of anyswitchgear assembly should not be permitted.

Never leave a breaker in an intermediate position in its compartment.Always crank the breaker into the fully connected or withdrawn position.

Before removing a bolted-on cover first make sure that all the circuitshave been de-energized.

Never try to disconnect or open the secondary circuit of a currenttransformer that is carrying load current. In this situation the trans-former develops a dangerous high voltage. Before attempting work

either de-energize the circuit by opening the breaker or short-circuitthe secondary of the current transformer.

CAUTION

READ THIS ENTIRE MANUAL BEFORE ATTEMPTING TO INSTALLTHE SWITCHGEAR. THROUGHOUT THIS MANUAL THERE WILL BEFIGURES WITH ITEMS LABELED WITH NUMBERS IN BALLOONS.THESE NUMBERS REFER TO THAT PARTICULAR ITEM WHICH ISDRAWN OUT IN DETAIL WITH FRONT AND SIDE VIEWS ANDDIMENSIONS TO EASE IN THE IDENTIFICATION OF THAT PAR-TICULAR ITEM. THE DRAWINGS OF THESE ITEMS CAN BE FOUNDON PAGES 14 AND 15.

1. RECEIVING, HANDLING AND STORING OFOUTDOOR AND INDOOR SWITCHGEAR

1.1 Receiving Switchgear

The switchgear is shipped to the customer as completely assembledas possible. Depending on the number of switchgear vertical sectionsit may be necessary to ship in several groups to facilitate handling.

Each indoor switchgear group is bolted to wooden skids and covered.Each outdoor switchgear group is permanently bolted to a structuralsteel base and covered.

Each switchgear group and all cartons and crates are labeled with anorder number and a shipping weight. On one of the groups there willbe a shipping packet, securely attached, that contains the shippinglist, drawings, etc.

When the switchgear arrives at the installation site, check to makesure all the parts described on the shipping list have been received.

Do this before discarding the packing material to prevent losing parts.If the switchgear has been damaged, file a claim as soon as possiblewith the carrier and notify the nearest Cutler-Hammer representative.

If the switchgear is going to be installed when it has been received,unpack it and handle it according to the procedure outlined in thefollowing sections. If the switchgear is to be stored, inspect it to makesure the shipment is complete and undamaged. Repack it so it will beprotected until it has been installed. Follow the instructions in theStoring Switchgear section for the proper storage procedures.

1.2 Storing Switchgear

WARNING

FAILURE TO PROPERLY STORE AND PROTECT SWITCHGEARMAY CAUSE DAMAGE TO EQUIPMENT. SUCH DAMAGE COULDCAUSE DEATH, SEVERE PERSONAL INJURY OR PROPERTYDAMAGE WHEN EQUIPMENT IS ENERGIZED.

Packing for shipping is not suitable for storage. Part of the originalpackaging may be discarded when switchgear is removed from thecarrier. Switchgear bus runs, because of their open connection ends,are particularly vulnerable to moisture and dirt during storage.

If the switchgear must be stored for a while, prepare a suitable storagespace. Outdoor switchgear can be stored outdoors but bus run openend connection ends should be covered to protect from the elementsuntil assembly is possible. Energize the switchgear heaters to keepmoisture from forming inside the switchgear. A terminal block isfactory wired for customer supplied power connection to the heaters.Keep indoor switchgear indoors in a heated building that is clean and

dry. The floor should be smooth and level to prevent strain anddistortion in the equipment. Be sure the space is well drained so thereis no standing water.

Take steps to prevent the switchgear against dampness, cement dust,corrosive atmospheres, and extreme temperature changes. To controlcondensation, make sure the equipment is well ventilated. Installtemporary space heaters if necessary.

Switchgear should be checked periodically for any signs of deterioration.It is the responsibility of the purchaser to ensure protection during storage.

1.3 Handling Switchgear Assemblies

WARNING

SWITCHGEAR IS UNSTABLE AND HEAVY. MOVE EQUIPMENTWITH CAUTION. FAILURE TO FOLLOW PROPER HANDLINGPROCEDURES COULD CAUSE EQUIPMENT TO TIP AND LEADTO SEVERE PERSONAL INJURY OR DAMAGE TO EQUIPMENT.

The preferred method of handling all switchgear assemblies is by crane.Lifting members are bolted to the top of each shipping group. Put a cranehook through each of the four holes to lift and move the group. After thegroup has been moved into the installation position, remove the liftingmembers and discard them. Figure 1 shows the lifting members forindoor, outdoor aisle-less and outdoor common aisle switchgear. Figure 2shows the lifting members for outdoor sheltered aisle switchgear.

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NOTE: Indoor switchgear will not have sloped roof sheets, steelchannels under units, or front and rear rain resistant doors.

b. Let the shipping skids remain on each group until the grouphas been moved into its final installation position. (The skidshelp protect the switchgear and reduce the risk that it will bedamaged or distorted during the move.)

c. If an odd number of groups is to be installed, install the middle onefirst. Then install the other groups, working out from the middle.

If an even number of groups is to be installed, start with eithergroup on either side of the middle shipping break.

If a unit substation or a power center is being installed, line upthe power transformer and the adjacent switchgear group first.Set them in the position called for on the drawing of the baseplan. Then install the rest of the groups.

d. Handling the switchgear by crane is the preferred method.

Move the first group into position. Line up the bolt holes in thebase of the vertical sections with the bolt holes in the steelchannels in the foundation. A few inches in front of the line-updraw a base line along the length of the intended location ofswitchgear. As the groups are maneuvered into place, keep thefront of each group parallel to the base line.

e. A bolt at each end of the wooden skids holds the skids to thebase of the group. Lift the shipping group, remove the bolts,and discard the skids.

f. Set the group into its installation position. Use a level to makesure the group is level both across its width and along itslength. Use a plumb line to make sure the group is plumb.(To level or plumb the group, use shims at the points wherethe vertical sections will be bolted or welded to the floors.)

Move each group into position and repeat the preceding steps.Use a come-along or other necessary means to pull thegroups all the way together.

2. Bolt the groups together through the tie bolt holes.

a. Remove the back covers from the vertical sections on eachside of the shipping group. Install tie bolts between shippinggroups. After all tie bolts are installed, tighten tie bolts down.There are two tie bolt locations at the rear of the mid moduleand six locations (three in the front, three in the back) on therear module. Figure 3 shows the locations of the tie bolts.

Fig. 1 Lifting Angles For Indoor, Outdoor Aisle-Less andOutdoor Common Aisle

2. INSTALLATION OF SWITCHGEAR

2.1 Installation of Indoor Switchgear

The following instructions are for the installation of indoor switchgear.

All internal connections (i.e. main bus and ground bus) are listed in theInternal Connections section on page 7.

1. Align the shipping groups side by side on the foundation. Finishedfoundation surface (including floor steel) must be flat, level, and intrue plane.

a. Remove the crating and packaging material from the groups ofswitchgear that are going to be installed.

Fig. 2 Lifting Angles For Outdoor Sheltered Aisle

Fig. 3 Tie Bolt Locations

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b. Open the front panels on the vertical sections. Insert andtighten tie bolts between the front upright members. There arefour tie bolt locations in the front of the mid module. There arefour tie bolt locations at the front and rear of the front module.Figure 3 shows the locations of the tie bolts.

3. Bolt or weld the entire switchgear system to the channels in the

foundation. Check the system again to make sure it is level and plumb.

4. Remove all the shipping blocks or braces. Examine all the meters,relays, etc. and remove any shipping blocks or braces. Removelifting angles from top of the units and discard them.

2.2 Installation of Outdoor Aisle-less Switchgear

The following instructions are for the installation of outdoor aisle-lessswitchgear. All internal connections (i.e. main bus and ground bus) arelisted in the Internal Connections section on page 7.

1. Align the shipping groups side by side on the foundation.

a. Remove the crating and packaging material from the groupsof switchgear that are going to be installed.

b. Remove any overhanging end caps, end trim, and seamcovers from the groups of switchgear. These will be replacedat a later time (Step 5). Figures 4 and 5 show the placement ofthe end caps, end trim and seam covers that may need to beremoved and replaced during assembly.

c. If an odd number of groups is to be installed, install the middle one

first. Then install the other groups, working out from the middle.

If an even number of groups is to be installed, start with eithergroup on either side of the middle shipping break.

If a unit substation or a power center is being installed, line upthe power transformer and the adjacent switchgear group first.Set them in the position called for on the drawing of the baseplan. Then install the rest of the groups.

d. Handling the switchgear by crane is the preferred method.

Move the first group into position. Line up the bolt holes in thebase of the vertical sections with the bolt holes in the steelchannels in the foundation. A few inches in front of the line-updraw a base line along the length of the intended location ofswitchgear. As the groups are maneuvered into place, keep

the front of each group parallel to the base line.

e. A bolt at each end of the wooden skids holds the skids to thebase of the group. Lift the shipping group, remove the bolts,and discard the skids.

f. Set the group into its installation position. Use a level to makesure the group is level both across its width and along itslength. Use a plumb line to make sure the group is plumb.(To level or plumb the group, use shims at the points wherethe vertical sections will be bolted or welded to the floor.)

Move each group into position and repeat the preceding stepsUse a come-along or other necessary means to pull thegroups all the way together.

2. Bolt the groups together through the tie bolt holes.

a. Remove the back covers from the vertical sections on each sideof the shipping group. Install tie bolts between shipping groups.After all tie bolts are installed, tighten tie bolts down. There aretwo tie bolt locations at the rear of the mid module and sixlocations (three in the front, three in the back) on the rearmodule. Figure 3, page 4 shows the locations of the tie bolts.

b. Open the front panels on the vertical sections. Insert andtighten tie bolts between the front upright members. There arefour tie bolt locations in the front of the mid module. There arefour tie bolt locations at the front and rear of the front module.Figure 3, page 4, shows the locations of the tie bolts.

3. Remove all the shopping blocks or braces. Examine all themeters, relays, etc. and remove any shipping blocks or braces.Remove lifting angles from top of the units and discard them.

4. Attach tie down clamps to the foundation. For seismic applica-tions, secure units to foundation using tie down clamps. Securethe switchgear to the foundation with the supplied tie down clipsper the outdoor aisle-less base plan.

5. Install the seam covers and roof fillers. Install filler pieces and unitseam covers using proper hardware from detail box. If unit endtrim is not on each end of shipping group, install at this time usingproper hardware from detail box. Refer to Figures 4 and 5 for theplacement of these items.

6. Install all skirts around the bottom of the unit.

Fig. 4 End Trim Cap and End Trim(Style numbers are for hardware located in detail box.)

Fig. 5 Front and Rear Filler Pieces Locations

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2.3 Installation of Outdoor Sheltered Aisle Switchgear

The following instructions are for the addition of a sheltered aisle to outdoorswitchgear. The installation of the outdoor sheltered aisle is the same as thatof the outdoor aisle-less except for the following additional instructions.

The outdoor sheltered aisle is shipped as completely assembled as possible.

The aisle is already attached to the switchgear groups for ease of assembly.

1. After switchgear group is in its desired location, remove the liftingangle from the top of the switchgear. The lifting angles areattached to both the switchgear units and to the aisle.

2. With all the groups in place, tie bolt the aisle walls and switchgearunits together. (There are ten (10) aisle wall tie bolt locations.) Referto Figure 3, page 4 for the location of the unit tie bolt locations.

3. Install (if not already installed) the right and left hand end trim,right and left roof filler, right and left aisle unit filler, unit seamcover, mid roof filler, and rear filler. Figures 6 and 7 show theplacement of these items.

4. Install (if not already installed) the aisle seam cap, right and leftaisle end trim cap and end trim. Refer to Figures 6 and 7.

5. For seismic applications, secure the aisle to the foundation usingclamps pre-attached to the aisle and unit base channels. Theclamps can be accessed through the floor panels on the aislebase. Rear unit clamps are supplied in the detail box. Secure theswitchgear to the installation pad per the base plan supplied.

6. Install all skirts around the bottom of the unit.

2.4 Installation of Common Aisle

The following instructions are for the installation of a common aisleswitchgear. All internal connections (i.e. main bus and ground bus)are listed in the Internal Connections section on page 7.

1. Common Aisle Switchgear MUST be installed in the followingsequence:

Installation of first lineup of switchgear in correct locationon installation pad

Installation of aisle base to first lineup of switchgear Installation of second lineup of switchgear to aisle base

and first lineup of switchgear Installation of aisle roof panels Installation of aisle walls

2. Align the shipping groups side by side on the foundation.

a. Remove the crating and packaging material from the groupsof switchgear that are going to be installed. Remove anyoverhanging filler pieces and seam covers from the groups ofswitchgear. Figure 7 shows the placement of the filler piecesand seam covers that may need to be removed and replacedlater during assembly.

b. If an odd number of groups is to be installed, install the middle onefirst. Then install the other groups, working out from the middle.

If an even number of groups is to be installed, start with eithergroup on either side of the middle shipping break.

If a unit substation or a power center is being installed, line up

the power transformer and the adjacent switchgear group first.Set them in the position called for on the drawing of the baseplan. Then install the rest of the groups.

c. Handling the switchgear by crane is the preferred method.Move the first group into position. As the groups are maneu-vered into place, keep the front of each group parallel andclose as possible to the placement line.

d. Move each group into position and repeat the preceding steps.Use a come-along or other necessary means to pull thegroups all the way together.

3. Bolt the groups together through the tie bolt holes.

a. Remove the back covers from the vertical sections on each sideof the shipping group. Install tie bolts between shipping groups.

After all tie bolts are installed, tighten tie bolts down. There aretwo tie bolt locations at the rear of the mid module and sixlocations (three in the front, three in the back) on the rearmodule. Figure 3, page 4, shows the locations of the tie bolts.

b. Open the front panels on the vertical sections. Insert andtighten tie bolts between the front upright members. There arefour tie bolt locations in the front of the mid module. There arefour tie bolt locations at the front and rear of the front module.Figure 3, page 4, shows the locations of the tie bolts.

Fig. 6 Unit and Aisle End Trim Locations

Fig. 7 Filler Pieces and End Trim Locations

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4. Remove all the shipping blocks or braces.

Examine all the meters, relays, etc. and remove any shippingblocks or braces. Remove lifting angles from top of the unitsand discard them.

5. Remove the 3/4 inch bolts from the front channels of each

switchgear vertical section and discard. These will be replacedlater by tie bolts that join the aisle bases to the switchgear.

6. Install the aisle floor. The floor is pre-assembled with three aislebases per shipping group. Slide the aisle bases to the firstswitchgear lineup until both channels are touching. The twochannels should now be forming a box.

NOTE: The aisle base has a 1/4 inch lip that sits on top of theswitchgear unit channel. Be sure to lift the aisle basesup when sliding toward the switchgear channels.

Below the access panels on the aisle, line up the tie bolt holes.Install two tie down clips and four 3/4 inch bolts at each verticalswitchgear section.

Continue installing aisle bases in the same manner until all are in

place. Place the service covers over the openings.

7. Install the opposite side switchgear units.

Lift the aisle base assembly off the ground approximately twoinches to allow the switchgear channels to sit under the 1/4 inchlip of the aisle base. The two channels should be forming a boxlike the opposite side. Align the tie bolt holes by moving theswitchgear to the proper location. Install two tie down clips andfour 3/4 inch bolts at each vertical switchgear section.

8. Install the aisle roofs. The aisle roofs are identical unless equipmenthas been attached, such as fans or heaters.

9. Install the aisle roof starting at unit one. Note the high side of theroofs are over the units opposite unit one. Secure the roof panelswith the supplied hardware.

10. Install the aisle roof seam covers.

11. Install the aisle fillers. Refer to Figure 7, page 6.

12. Remove the three screws on the unit roof end trim and slide it towardthe rear approximately three (3) inches. Do this on all four corners.

13. Install the aisle end walls. Identify the left end door frame (as seenwhile facing unit one). Place gasket material (if not already installed)on the two edges of the aisle end wall. Raise the wall up to theswitchgear and raise the wall over the aisle roof sheet so that thewall end trim will slide over the lip on the roof panel. (It may beeasier to remove the wall en/d trim for prior to installation. Replaceafter the end wall has been secured to the switchgear units.) Alignthe weld studs on the aisle wall to fit in the openings on theswitchgear side walls. Refer to Figure 8. After weld studs are in the

openings, place supplied hardware over weld studs and tighten.

14. Identify the right end wall and repeat step 13.

15. Slide the unit roof end trims forward and install hardware removedearlier (all four corners). Refer to Figure 9 for the proper overlap.

16. Install unit seam covers and roof fillers. Refer to Figure 7, page 6.

17. Install tie down clips at the rear of both switchgear lineups. Rearunit clamps are supplied in the detail box. Secure the switchgearto the installation pad per the base plan supplied.

18. After installation is complete, close all doors and check for lightseeping into aisle area. Use gutter seal or additional gasketmaterial to fill in any areas light is coming in.

Fig. 8 Openings For Wall Weld Studs

Fig. 9 Proper Overlap of Unit and Aisle End Trim

3. INTERNAL CONNECTIONS

The following instructions are for the internal connections of theground bus, high voltage bus, wiring and other internal items.

1. Connect the ground bus.

a. The ground bus in the switchgear is assembled in sections.There is a joint in each housing. Solderless terminals areprovided on the ground bus in each end unit. Use theseterminals to connect the ground bus to the station ground.Make the connection as direct as possible. It should be largeenough to carry the ground fault current of the installation.Never house it in a metal conduit. (NOTE: The unit to unitground bus is supplied in the detail box.)

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b. The standard ground bus is a .25-inch x 2-inch copper busbar bolted to the cross members of the frame in the bottomof each enclosure. The ground bus runs through the centerof each section through the length of the entire switchgearsystem. Where the system is split for shipping, a splice plate(and hardware) is furnished to bridge the shipping break whenthe system is installed. Refer to Figure 13.

2. Connect the high voltage bus between shipping groups.

a. Remove the horizontal and vertical metal barriers from thecable compartment in the rear of the switchgear. Removethe vertical section of the bus barrier. Also remove any othercomponents such as potheads, surge suppressors, etc. thatinterfere with access to the bus compartment. (NOTE: Rearassembly of switchgear may vary from customer to customer.)Figures 10 through 12 show the removal of necessary barriers.

b. Obtain the section of bus that was removed to separate thegroups for shipping. Each section is labeled and shipped inthe carton with the details.

Fig. 10 Removal of Necessary Barriers

Fig. 11 Removal of Necessary Barriers

Fig. 12 Removal of Necessary Barriers

Fig. 13 Main Bus Installation

Fig. 14 Insulation Boots and Ground Bus Bar

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c. The surfaces in the bus joints are silver or tin plated. Cleanthe plated surfaces of the bus section if necessary.

d. Slide the section of bus through the supports in the side of thevertical section. Slide the rubber snubber along the bus until itfits inside the opening in the bus support.

When the bus section is disconnected for shipping, the splice platesand hardware are left bolted to the end of the bus in each of theadjoining vertical sections. Sandwich the end of the disconnectedsection between the splice plates and fit the other end of the sectionbetween the splice plates on the end of the bus in the adjacentsection. Bolt the splice plates together on each end of the bus section.

Repeat these steps for each section of bus at each shipping break.

Tighten the bolts for the splice plates to the torque shown in Table 1.

Cover joint with the insulating boot provided. Figures 13 and 14,page 8, show the insulating boots and the bus run installation.

3. Reconnect the wiring that was disconnected at the factory forshipping. The wiring is labeled as well as the connecting points.

a. Connect the wiring to the remote apparatus and to the terminalblocks mounted within the front of the vertical sections.

4. Replace the metal barriers and any other parts that may havebeen removed to give access to the bus compartments.

5. Connect the main power cables.

a. Before connecting a cable, determine its phase. Theswitchgear system is usually supplied with connections forphasing 1-2-3, left to right (viewed from the front). Check theshop order drawing to make sure because sometimes anotherphasing may have been specified.

b. If the two systems are to be parallel, make sure the phaserotation and the phase angles are the same. They must be thesame to prevent damaging the equipment. The phase rotation

must conform to the phase rotation on the shop order drawingso that the instruments, meters, and relays will operate properly.

c. When forming cables to fit inside the cable compartment, avoidbending it sharply or kinking it. Make sure it does not rest onsharp corners or edges that could damage the insulation.

d. Follow the instructions of the cable manufacturer to determinewhat minimum bending radii is permitted. Follow the instruc-tions on insulating the joints so the insulation will taperproperly through the correct gradient. The insulation will varywith the type and size of cable and with the service voltage forwhich it was designed.

Table 1 Bolt Tightness for Bus Connections

Fig. 15 Assembled Switchgear

e. Solderless connectors are usually furnished if the cable isnon-leaded. The connection must be insulated accordingto the recommendation of the cable manufacturer.

f. If potheads or other types of terminators are furnished,follow the instructions of the manufacturer when connectingthe cable to them. Use the flexible connectors to connect the

aerial lugs to the conductors. This will keep strain off theinsulators of the pothead or the terminator. Tape (or otherwiseinsulate) the entire joint (including the flexible connectors).

g. If zero sequence current transformers are used, pass thepower cables through the transformer. Connect it to theterminals or to a pothead.

6. Replace all horizontal and vertical metal barriers from the cablecompartment in the rear of the switchgear.

a. Replace all metal barriers, vertical section of the bus barrier, andany other components removed during hookup of the high voltagebus. Refer to the previous steps, but in the reverse manner.

7. Replace the rear covers on all the vertical sections. Refer to Figure 15

Bolt Material Torque in foot-pounds (N-m)for Bolt Size-Inches (mm)

0.25 (6.35) 0.31 (7.87) 0.38 (9.65) 0.5 (12.7) 0.62 (15.75)

High Strength Steel 5 (6.78) 12 (16.27) 20 (27.12) 50 (67.80) 95 (128.82)

Silicon Bronze 5 (6.78) 10 (13.56) 15 (20.34) 40 (54.24) 55 (74.58)

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Table 2 Typical Unit Weights (Pounds and Kilograms)

See circuit breaker instruction book for breaker weights.

The vertical sections refer to the combination of auxiliary compartments and breaker compartments. The combinations are: breaker over breaker (B/B), breaker over

auxiliary (B/A), auxilliary over breaker (A/B), auxiliary over auxiliary (A/A), and breaker (B) over/under a blank compartment.

4. TYPICAL WEIGHT OF UNITS

Type of Main Bus Indoor Aisle-Less Single Aisle Common AisleVertical Rating- Vertical Vertical Vertical Section Vertical Section

Section Ampere Section Section Unit + Aisle = Total Unit + Aisle + Unit = Total Lbs. Kg. Lbs. Kg. Lbs. Kg. Lbs. Kg.

B/B 1200 2400 1089 3150 1429 3450 1565 6100 27672000 2500 1134 3250 1474 3550 1610 6300 28583000 2600 1179 3350 1520 3650 1656 6500 2948

B/A or A/B 1200 2300 1043 3050 1383 3350 1520 5900 26762000 2400 1089 3150 1429 3450 1565 6100 27673000 2500 1134 3250 1474 3550 1656 6300 2858

A/A 1200 2000 907 2750 1247 3050 1383 5300 24042000 2100 953 2850 1293 3150 1429 5500 24953000 2500 1134 2950 1338 3250 1474 5700 2585

B/BLANK 1200 2200 998 2950 1338 3250 1474 5700 2585or BLANK/B 2000 2300 1403 2850 1293 3150 1429 5900 2676

3000 2400 1089 3150 1429 3450 1565 6100 2767

Fig. 16 Parts With Brief Description and Dimensions

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Effective 2/99

Page 11I.B. 32-255T

Fig. 17 Parts With Brief Description and Dimensions

Fig. 18 Outdoor Aisle-less Right Side View With Dimensions

Fig. 19 Outdoor Sheltered Aisle Right Side View With Dimensions

Fig. 20 Outdoor Common Aisle Right Side View With Dimensions

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Pittsburgh, Pennsylvania U.S.A.

Publication No. I.B. 32-255T

February 1999

Printed in U.S.A./ZTD99001

Cutler-Hammer