S&C Mark VI Guide

S&C ELECTRIC COMPANY
Specialists in Electric Power Switching and Protection
Instructions for Installation
S&C Circuit-Switchers—Mark VI
Outdoor Transmission
69 kV through 138 kV
Option “U,” User-Furnished Mounting Structure
Instruction Sheet 712-502
November 14, 2005 ©2005
Supersedes Instruction Sheet 712-502 dated 10-18-04
Section Page Section Page
INTRODUCTION
Operating Considerations. . . . . . . . . . . . . . . . . . . . . . . .2
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . .2
Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . . .2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SAFETY INFORMATION
Understanding Safety-Alert Messages . . . . . . . . . . . . .4
Following Safety Instructions . . . . . . . . . . . . . . . . . . . .4
Replacement Instructions and Labels. . . . . . . . . . . . . .4
Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . . .5
SAFETY PRECAUTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .6
INSPECTION AND PACKING
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
INSTALLATION
Before Starting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Installing the Disconnect Pole-Units . . . . . . . . . . . . . .9
Installing the Interrupters . . . . . . . . . . . . . . . . . . . . . .10
Checking Operation of Disconnect . . . . . . . . . . . . . . . 15
Installing the Drive Train, Gearbox, and Interphase
Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Installing the Mark VI CS-1A Switch Operator and
Vertical Shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Installing the Interrupter Charging Motors . . . . . . . .23
Installing the User-Furnished Conduit . . . . . . . . . . . .25
Wiring the Interrupters and Charging Motors . . . . . .26
WIRING AND ADJUSTING THE SWITCH OPERATOR
Before Starting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Connecting Control Power and User-Furnished
Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Using the Manual Operating Handle . . . . . . . . . . . . . .31
Using the Decoupling Selector Handle . . . . . . . . . . . .32
Adjusting the Switch Operator . . . . . . . . . . . . . . . . . . 34
INSTALLING TERMINAL PADS AND CONDUCTOR
Installing the Terminal Pad . . . . . . . . . . . . . . . . . . . . . 47
CIRCUIT-SWITCHER START-UP AND CHECKOUT
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Checkout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
INDICATORS
Understanding the Interrupter Indicators . . . . . . . . .53
Understanding the Gas-Pressure Gauge. . . . . . . . . . .54
Understanding the Optional Remote Gas-Density
Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
TABLE OF CONTENTS

712-502 2
INTRODUCTION
Operating
Considerations ÇCAUTION
The equipment covered by this publication must be selected for a specific application and
it must be installed, operated, and maintained by qualified persons who are thoroughly
trained and who understand any hazards that may be involved. This publication is written
only for such qualified persons and is not intended to be a substitute for adequate training
and experience in safety procedures for this type of equipment.
Qualified Persons ÇWARNING
The equipment covered by this publication must be installed, operated, and maintained by
qualified persons who are knowledgeable in the installation, operation, and maintenance
of substation electric power distribution equipment along with the associated hazards.
A qualified person is one who is trained and competent in:
• The skills and techniques necessary to distinguish exposed live parts from non-live
parts of electrical equipment.
• The skills and techniques necessary to determine the proper approach distances
corresponding to the voltages to which the qualified person will be exposed.
• The proper use of the special precautionary techniques, personal protective equip-
ment, insulating and shielding materials, and insulated tools for working on or near
exposed energized parts of electrical equipment.
These instructions are intended only for such qualified persons. They are not intended
to be a substitute for adequate training and experience in safety procedures for this
type of equipment.
Read this
Instruction Sheet
Read this instruction sheet before installing or operating your S&C Circuit-Switcher
—Mark VI. Familiarize yourself with “SAFETY INFORMATION” on pages 4 through 5.
Retain this
Instruction Sheet
This instruction sheet is a permanent part of your S&C Circuit-Switcher—Mark VI. These
instructions should be stored in the Mark VI CS-1A Switch Operator instruction manual
holder on the operator door.

712-502
3
Proper Application ÇCAUTION
The equipment in this publication is only intended for use in the switching and protection
of capacitor banks and substation transformers. The application must be within the
ratings furnished for the equipment. The ratings for this Mark VI Circuit-Switcher are
listed on the nameplate on the side of the Mark VI CS-1A Switch Operator.
Warranty The warranty and/or obligations described in S&C’s standard conditions of sale, as set
forth in Price Sheet 150, plus any special warranty provisions, as set forth in the applicable
product-line specification bulletin, are exclusive. The remedies provided in the former for
breach of these warranties shall constitute immediate purchaser’s or end user’s exclusive
remedy and a fulfillment of all seller’s liability. In no event shall seller’s liability to imme-
diate purchaser or end user exceed the price of the specific product which gives rise to
immediate purchaser’s or end user’s claim. All other warranties whether express or implied
or arising by operation of law, course of dealing, usage of trade or otherwise, are excluded.
The only warranties are those stated in Price Sheet 150, and THERE ARE NO EXPRESS
OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION PROVIDED IN PRICE
SHEET 150 IS GRANTED ONLY TO THE IMMEDIATE PURCHASER AND END USER, AS
DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE PURCHASER MAY
RELY ON ANY AFFIRMATION OF FACT OR PROMISE THAT RELATES TO THE GOODS
DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES TO THE GOODS, OR ANY
REMEDIAL PROMISE INCLUDED IN PRICE SHEET 150.
The seller’s warranties are contingent upon the installation and adjustment of Mark VI
Circuit-Switchers in accordance with S&C’s applicable instruction sheets, data sheets,
and/or data bulletins.
INTRODUCTION

712-502 4
Understanding
Safety-Alert
Messages
There are several types of safety-alert messages which may appear throughout this instruction
sheet as well as on labels and tags attached to the Mark VI Circuit-Switcher. Familiarize
yourself with these types of messages and the importance of the various signal words, as
explained below:
ÇDANGER
“DANGER” identifies the most serious and immediate hazards which will likely result
in serious personal injury or death if instructions, including recommended precautions,
are not followed.
ÇWARNING
“WARNING” identifies hazards or unsafe practices which can result in serious
personal injury or death if instructions, including recommended precautions, are not
followed.
ÇCAUTION
“CAUTION” identifies hazards or unsafe practices which can result in minor personal
injury or product or property damage if instructions, including recommended
precautions, are not followed.
NOTICE
“NOTICE” identifies important procedures or requirements which can result in product
or property damage if instructions are not followed.
Following Safety
Instructions
If you do not understand any portion of this instruction sheet and need assistance, contact
your nearest S&C Sales Office or S&C Authorized Distributor. Their telephone numbers are
listed on S&C’s website www.sandc.com. Or call S&C Headquarters at [phone]; in
Canada, call S&C Electric Canada Ltd. at [phone].
NOTICE
Read this instruction sheet thoroughly and
carefully before installing or operating
your S&C Circuit-Switcher—Mark VI.
Replacement
Instructions and
Labels
If you need additional copies of this instruction sheet, contact your nearest S&C Sales Office,
S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.
It is important that any missing, damaged, or faded labels on the equipment be replaced
immediately. Replacement labels are available by contacting your nearest S&C Sales
Office, S&C Authorized Distributor, S&C Headquarters, or S&C Electric Canada Ltd.
SAFETY INFORMATION

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5
SAFETY INFORMATION
Location of Safety Labels
Reorder Information for Safety Labels
Location Safety-Alert Message Description Number
AÇWARNING Use push button control to open or close... G-9025
BÇWARNING Do not disassemble or modify... G-7015-5
CÇWARNING DO NOT operate the Circuit-Switcher with... G-9024
DÇCAUTION Unauthorized changes should not be made... G-9027
EÇCAUTION DO NOT operate the Circuit-Switcher with… G-9026
E
A
C
DB

712-502 6
SAFETY PRECAUTIONS
ÇDANGER
Mark VI Circuit-Switchers operate at high voltage. Failure to observe the
precautions below will result in serious personal injury or death.
Some of these precautions may differ from company operating procedures and rules.
Where a discrepancy exists, users should follow their company’s operating procedures
and rules.
1. QUALIFIED PERSONS. Access to substation switching
equipment must be restricted only to qualified persons.
See “Qualified Persons” on page 2.
2. SAFETY PROCEDURES. Always follow safe operating
procedures and rules.
3. PERSONAL PROTECTIVE EQUIPMENT. Always
use suitable protective equipment such as rubber
gloves, rubber mats, hard hats, safety glasses, and
flash clothing in accordance with safe operating pro-
cedures and rules.
4. SAFETY LABELS AND TAGS. Do not remove or
obscure any of the “DANGER,” “WARNING,” “CAUTION,”
and “NOTICE” labels and tags. Remove tags ONLY if
instructed to do so.
5. ENERGIZED COMPONENTS. Always consider all
parts live until de-energized, tested, and grounded.
6. CIRCUIT-SWITCHER POSITION. Always confirm
the open/close position of Circuit-Switchers by visually
observing the position of the blades. Switches may be
energized from either side and with the blades in any
position.
7. MAINTAINING PROPER CLEARANCE. Always main-
tain proper clearance from energized components.
8. OPERATION. Circuit making and breaking is involved
in the normal operation of this interrupter switch and,
as a result, “partway” opening or closing is undesirable.
To operate, follow the operating procedure as outlined
in Instruction Sheet 712-501.

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7
INSPECTION AND PACKING
Inspection Examine the shipment for external evidence of damage as soon after receipt as possible, prefer-
ably before removal from the carrier’s conveyance. Check the bill of lading to make sure that all
shipping skids, crates, and containers listed thereon are present.
If there is visible loss and/or damage:
1. Notify the delivering carrier immediately.
2. Ask for a carrier inspection.
3. Note condition of shipment on all copies of the delivery receipt.
4. File a claim with the carrier.
If concealed damage is discovered:
1. Notify the delivering carrier within 15 days of receipt of shipment.
2. Ask for a carrier inspection.
3. File a claim with the carrier.
Also notify S&C Electric Company in all instances of loss and/or damage.
Packing An S&C catalog drawing and/or erection drawing will be found in a water-resistant envelope
attached to the interrupter container on one of the three Circuit-Switcher pole-unit disconnects.
A packing list is included. Please use the packing list to confirm that all parts have been received
before beginning assembly. Keep the packing list for future reference.
The Mark VI Circuit-Switcher shipment includes all three phases of the integral disconnect
mounted on a single skid. Each phase is factory-assembled and adjusted. Drive-train operating
shafts, interphase couplings, mounting hardware, and a temporary hand adapter for checking
the operation of the integral disconnects—all individually identified—is also packed with the
disconnect pole-units. The interphase and vertical shafts are cut to length.
Three interrupters are packed in a separate crate along with associated mounting hardware.
Three interrupter charging motors and their associated mounting hardware are packed in a
separate crate. The Mark VI CS-1A Switch Operator is shipped on a separate skid. If furnished,
options such as a grounding switch or pre-insertion inductors are shipped in their own crates.
ÇWARNING
DO NOT disassemble or modify the pole-units. The pole-units are pressurized at 75
PSIG. Serious injury can result.
Storage ÇCAUTION
The Mark VI CS-1A Switch Operator is equipped with a space heater that must be
energized during storage to prevent condensation and corrosion within the operator
enclosure.
If the Circuit-Switcher must be stored before installation, keep it in a clean, dry, corrosion-free
area to protect it from damage. Make sure each skid rests firmly on the ground and is reasonably
level. Shoring under the skids may be necessary if the ground is uneven.
If storing outdoors, connect control power to the space heater inside the Mark VI CS-1A Switch
Operator per the wiring diagram furnished. Inspect the Circuit-Switcher regularly when storing
for prolonged periods.

712-502 8
INSTALLATION
ÇCAUTION
The user-furnished mounting structure
must meet the guidelines for static and
dynamic loading limits listed in S&C
Data Bulletin 712-60. Failure to observe
these guidelines can result in equip-
ment damage.
Before Starting
If a detailed technical drawing of the user-
furnished mounting structure was supplied
when the switch was ordered, appropriate
mounting holes will be pre-drilled in the base
of each pole-unit. Mounting brackets, channel
sections, or spacers may be supplied with the
Mark VI Circuit-Switcher to facilitate instal-
lation on the existing user-furnished structure.
Refer to the supplied custom erection drawing
for details.
If a detailed technical drawing of the user-
furnished mounting structure was not supplied
when the switch was ordered, the pole-units
will be furnished with the mounting hole pattern
appropriate for Circuit-Switchers installed on
S&C Mounting Pedestals. A standard erection
drawing and reference drawing will be sup-
plied. Refer to this standard erection drawing
for details.
Step 1
Before removing the disconnect pole-units from
the skid, arrange the skid on a level surface, in
the position and order in which they will be
raised onto the mounting structure, as shown
on the associated erection drawing.
Step 2
Unbolt the wooden cross braces that secure the
disconnect pole-units to each other. DO NOT
unbolt the disconnect pole-units from the base
of the shipping skid at this time. See Figure 1.
Figure 1. Remove all packing materials from the disconnect pole-units.
DO NOT unbolt the disconnects from the skid until lifting slings are
attached.
Skid
Disconnect
pole-units
Skid

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9
INSTALLATION
Installing the Disconnect
Pole-Units
NOTICE
A crane or other suitable lifting device
is required to install the Mark VI Circuit-
Switcher. Ensure that an appropriate
lifting device is available at the installation
site before beginning the Circuit-Switcher
installation.
Repeat Steps 3 through 5 for each disconnect
pole-unit.
Step 3
Attach lifting slings to the eyebolts furnished
on the pole-unit base. With the blade in the fully
closed position, unbolt the first pole-unit to be
installed from the skid.
ÇCAUTION
DO NOT lift the disconnect pole-unit by
the disconnect blade, contacts, or other
live parts. Keep the blade in the closed
position during handling. Misalignment
and damage to the disconnect can occur
if not lifted properly.
Step 4
Make sure that the rigging does not stress the
blade or blade contacts. Raise the disconnect
to the appropriate elevation and position it
over the correct set of mounting holes in the
mounting structure. Avoid sudden starts and
stops, and avoid contact with other objects.
See Figure 2.
Step 5
Bolt the hinge end of the disconnect pole-unit
to the switch base using four ⁵⁄₈–11 1¹⁄₂hex-
head cap screws, flat washers and hex-head
nuts provided.
Bolt the jaw end of the disconnect pole-unit
to the channel assembly using two ⁵⁄₈–11 2¹⁄₄
hex-head cap screws, flat washers and hex
head nuts. (Other mounting hardware sizes
may be required. Refer to the erection drawing
for details on the pole-unit base mounting hole
arrangement.) See Figure 3.
Remove lifting slings. Remove eyebolts and
discard.
Lifting slings
Blade
Jaw end of
disconnect
pole-unit
Hinge end of disconnect
pole-unit
Figure 2. Attach lifting slings to the disconnect pole-unit and raise into
place on the structure.
Figure 3. Secure the disconnect pole-unit to the user-furnished
structure.
Lifting slings
Mounting
structure
Pole-unit
base

712-502 10
Installing the Interrupters
Repeat Steps 6 through 12 for each disconnect
pole-unit.
Step 6
Remove the interrupter from its shipping crate
and lift it using the following procedure:
ÇCAUTION
Lift the interrupter ONLY by the lifting
bracket. Lifting it by any other means
can damage the pole-unit.
Wrap a lifting sling around the lifting bracket
at the top of the interrupter. Carefully raise
the interrupter upward. The foam wrappings
around the top, mid-section, and base should
have come off as the interrupter is being lifted.
Remove these wrappings if they do not come off
by themselves. DO NOT remove the shipping
brace at this time. See Figures 4, 5, and 6.
ÇCAUTION
DO NOT remove the shipping brace
around the base of the interrupter at this
time. Damage to the operating shaft
can occur.
INSTALLATION
Figure 4. Lift the interrupter only by the lifting bracket.
Interrupter
Lifting bracket
Figure 5. Lift the interrupter carefully upward.
Lift upward
Figure 6. Interrupter with wrappings removed.
Interrupter
Shipping brace

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11
INSTALLATION
Step 7
With the interrupter lifted off the ground, check
that the gas-pressure gauge on the underside of
the interrupter is in the “OK” to operate zone.
See Figures 7 and 8.
NOTICE
The gas-pressure gauge needle should
be in the “OK” to operate zone. If the
gauge is not in this position, stop the
installation and notify S&C Electric
Company.
Figure 7. With the interrupter lifted off the ground, check the gas-pressure
gauge on the underside of each interrupter.
Interrupter indicators
Figure 8. Check that the gas-pressure gauge on each interrupter is in the
“OK” to operate zone.
“OK” to operate

712-502 12
Step 8
Remove the shipping brace from the interrupter
base. See Figure 9. Discard the bolt.
ÇCAUTION
DO NOT rest the interrupter on its base
after the shipping brace has been removed.
Damage to the operating shaft can
occur.
Step 9
With the interrupter still hoisted off the ground,
thread eight ⁵⁄₈–11 2stainless-steel studs
into the eight tapped interrupter mounting
bosses on the base of the interrupter. Hand-
tighten each stud 8 to 9 turns, until it bottoms.
See Figure 9.
ÇCAUTION
Never exceed the recommended torque
limit. The interrupter base contains SF6gas
and is pressurized to 75 PSI. Damage to
the interrupter may occur if studs are
overtorqued.
Step 10
Loosely assemble the two interrupter support
brackets and the motor brackets to the
interrupter base as shown in Figure 10, using
the installed ⁵⁄₈–11 2studs, flat washers
and uni-torque nuts furnished.
Install the cross support bracket (see Fig-
ure 10) between the two interrupter support
brackets with the four ⁵⁄₈–11 2¹⁄₄cap screws,
lock washers, and nuts furnished. The motor
bracket should be mounted between the cross
support bracket and the interrupter mounting
bosses, with the L-shaped portion of the bracket
facing away from the indicator window. See
Figure 11.
NOTICE
The interrupter mounting brackets for 69-,
115-, and 138-kV switches differ slightly in
shape and mounting configuration. Take
care not to inter-mix parts from different
switch installations. Refer to the associated
reference drawing for details.
INSTALLATION
Figure 11. Ensure that “L” shaped motor brackets are facing away from
the indicator window.
Motor brackets
Interrupter
Indicator
window
Interrupter support
bracket
Figure 9. Remove shipping brace to reveal mounting bosses.
Interrupter
mounting
bosses
Interrupter
mounting
bosses
Bolt
Shipping brace
Interrupter mounting
bosses (bosses on
rear of interrupter base
not shown)
Figure 10. Assemble mounting brackets to interrupter. (69-kV support
brackets shown.)
Interrupter
support
brackets
Motor
brackets
Cross-support
⁵⁄₈—11 2¹⁄₄
hardware
Interrupter
Cross-support
bracket
Cross-support
⁵⁄₈—11 2¹⁄₄
hardware

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13
Step 11
Position the interrupter mounting brackets
so that the holes in the brackets align with
the holes in the pole-unit base. See Figure 12.
Attach the interrupter mounting brackets to the
pole-unit base using eight ⁵⁄₈–11 2¹⁄₄hex-head
galvanized steel cap screws, flat washers, and
nuts furnished.
Step 12
Tighten all nuts on the interrupter and the base
to a torque of 70 to 80 ft.-lbs.
ÇCAUTION
Never exceed the recommended torque
limit. The interrupter base contains SF6gas
and is pressurized to 75 PSI. Damage to
the interrupter may occur if studs are
overtorqued.
ÇCAUTION
DO NOT wire-brush the buswork. The
buswork pieces are plated and do not
require abrasive cleaning as a part of their
preparation. Wipe any dirt or grease from
the surface and apply a thick coating of
Penetrox A or other appropriate conductor
preparation compound. Wire brushing
may damage the plating and cause
corrosion.
Step 13
The interrupter-to-disconnect buswork
assemblies are pre-assembled to ensure correct
hardware placement. Unfasten all hardware
before installation. Prepare the electrical bus
connection to the interrupter as follows:
a. Thoroughly clean the interrupter bus with a
soft cloth. Wire-brush the interrupter cast-
ing.
b. Immediately apply a liberal coating of Burndy
Penetrox® A or other suitable aluminum
connector compound to the clean surfaces.
c. Apply a coating of Penetrox A to the threads
of two ¹⁄₂–13 1hex-head stainless-steel
cap screws.
d. Attach the interrupter bus to the set of tapped
holes in the interrupter, using the coated cap
screws and two stainless-steel lock washers.
See Figure 13. Tighten the screws to a torque
of 70 to 80 ft.-lbs.
INSTALLATION
Figure 12. Attach interrupter mounting bracket to pole-unit base. Tighten
hardware.
Pole-unit
base
Interrupter
mounting
bracket
Motor brackets
Interrupter
Figure 13. Attach the interrupter bus to the tapped holes on the interrupter
casting.
Interrupter bus
Interrupter casting
¹⁄₂–13  1hexhead stainless-steel
cap screws and lockwashers

712-502 14
Step 14
Prepare the electrical connection to the
disconnect bus as follows:
a. Thoroughly clean the interrupter bus with
a soft cloth. Wire-brush the interrupter
casting.
b. Immediately apply a liberal coating of
Burndy Penetrox® A or other suitable alu-
minum connector compound to the clean
surfaces.
c. Apply a coating of Penetrox A to the threads
of two ¹⁄₂–13 1¹⁄₄hex-head stainless-steel
cap screws.
d. Attach the disconnect bus to the set of
tapped holes in the disconnect casting,
using the coated cap screws and four ¹⁄₂-inch
stainless-steel Belleville washers. See Figure
14. Tighten the screws to a torque of 50 to
60 ft.-lbs.
Step 15
Attach the interrupter bus to the disconnect bus
using the four ¹⁄₂–13 1¹⁄₂hex-head stainless-
steel cap screws, Belleville washers, and nuts
furnished. See Figure 15.
Avoid excess tension or torque between the
interrupter bus and the disconnect bus. If the
holes between the two sections of buswork
do not line up properly, loosen the hardware
securing the interrupter mounting brackets to
the disconnect base, and shift the interrupter
until the holes are aligned. Retighten the inter-
rupter hardware to a torque of 70 to 80 ft.-lbs
if necessary.
Step 16
Remove the lifting sling from the interrupter.
ÇCAUTION
Never exceed the recommended torque
limit. The interrupter base contains SF6
gas and is pressurized to 75 PSI. Damage
to the interrupter may occur if studs
are overtorqued.
INSTALLATION
Figure 14. Attach the disconnect bus to the tapped holes in the disconnect
casting. Overlap the interrupter bus.
¹⁄₂–13 1¹⁄₄stainless-steel
cap screws and lockwashers
Disconnect bus
Interrupter bus
Disconnect casting
Figure 15. Attach the interrupter bus to the disconnect bus.
Four ¹⁄₂–13 1¹⁄₄stainless-steel
cap screws, Belleville washers,
and nuts

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15
INSTALLATION
Checking Operation of Disconnect
Repeat Steps 17 through 19 for each pole-unit.
Step 17
Check operation of the blade using the following
procedure:
a. Bolt the temporary manual operating handle
to the disconnect drive-shaft crank. See
Figure 16. Firmly crank the disconnect to its
fully open position. Visually check that the
disconnect blade opens to 90° to 96° from
horizontal. See Figure 17.
b. If the blade does not open 90° to 96°, shim
underneath the disconnect base as required
to make up for any irregularities or distortion
in the mounting surface.
c. Make sure the pole-unit base is level, and that
the interrupter is vertically aligned with the
disconnect pole-unit insulators.
Figure 17. Check the angle of the disconnect blade.
90° to 96° Interrupter
Insulator
Base
Level base
Figure 16. Attach the manual operating handle to the drive-shaft crank.
Pole-unit base
Drive shaft crank
Temporary handle

712-502 16
INSTALLATION
Step 18
Check operation of the blade for proper
alignment of the blade with the jaw-contact
assembly. As the blade is closed, the fault-
closing tongue contact should engage each
of the fault-closing jaw contacts with equal
pressure and the current-carrying tongue
contact should enter the current-carrying jaw
contacts with equal clearance on each side.
The silver-surfaced area of the current-car-
rying tongue contacts should center laterally
with the silver-surfaced current-carrying jaw
contacts, and the blade should rotate with
slight pressure against the blade bumper stop
and come to rest either on the stop or slightly
above it. See Figure 18.
Step 19
Close the disconnect and remove the temporary
manual operating handle.
NOTICE
If the blade angle is not attained or the
contacts are not properly aligned after
leveling the disconnect base, stop the
installation and contact S&C Electric
Company.
Figure 18. Check penetration of the blade into the jaw contact during
closing.
Current-carrying
tongue contacts
Current-carrying
jaw contacts
Blade bumper
stop
Blade
Fault-closing
jaw contacts
Fault-closing
tongue contacts

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17
INSTALLATION
Installing the Drive Train, Gearbox,
and Interphase Shaft
Step 20
The drive train is comprised of several sections
of interphase shaft that connect the three
pole-units to each other, a section of vertical
operating shaft that is directly driven by the
Mark VI CS-1A Switch Operator and a gearbox
that connects the vertical operating shaft to the
interphase shaft. See Figure 19.
Figure 19. Drive train with coupling detail views.
Interphase shaft
Gearbox
Vertical shaft
Flexible coupling
Rigid coupling
Flexible coupling
(output shaft of operator)
T-coupling or rigid coupling
(T-coupling shown)

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INSTALLATION
Before installing the interphase shaft sec-
tions, attach all flexible coupling assemblies to
the disconnect drive shafts and the output end
of the gearbox (if necessary) where indicated
on the reference drawing.
Note that the rigid couplings to and from the
gearbox are factory-installed to the gearbox.
For some phase spacings, a short flanged sec-
tion of interphase shaft is provided to make
the connections between the gearbox and the
surrounding pole-units. Refer to the reference
drawing for specific details on the interphase
shaft arrangement. See Figure 19, shown on
page 17, for a typical drive train arrangement.
Step 21
Install the user-furnished gearbox support
onto the user-furnished structure. If a detailed
drawing of the user-furnished mounting
structure was supplied when the switch was
ordered, details of the gearbox support will be
found on the associated erection drawing.
The gearbox support must hold the gearbox
in a position such that the rigid couplings on
either side of the gearbox will be level with
the couplings on the pole-unit drive shafts. Use
shims as required.
The gearbox must also be positioned such
that the vertical operating shaft from the opera-
tor makes the correct angle to the gearbox as
shown on the reference drawing. (Flexible or
universal couplings may be used at the input
end of the gearbox. Check the reference draw-
ing for details.)
Step 22
Wrap appropriate lifting slings around the rigid
couplings and the main body of the gearbox,
and lift it into place on the gearbox support. See
Figure 20. When properly installed, the arrow on
the gearbox should face the direction indicated
on the reference drawing.
Step 23
Using the ¹⁄₂–13 tapped mounting holes on the
side of the gearbox, attach the gearbox to the
structure or user-furnished gearbox support.
Rigid coupling (one shown,
opposite side not visible)
Gearbox
Gearbox support
Flexible or
universal
coupling
(input)
Mounting holes
Figure 20. Install the gearbox.

712-502
19
Step 24
Attach the flexible coupling plate to the coupling
flange on the disconnect using the following
procedure:
Thread the flexible coupling attachment bolts
through the flexible coupling plate and through
the coupling flange.
Tighten the bolts to draw the flexible plate
flush against the flange; this will deform the
threads in the flexible plate, resulting in a bind-
ing, nonslip connection.
Install and tighten the self-locking nuts.
DO NOT use lockwashers with the flexible
coupling attachment bolts. See Figure 21.
Step 25
Before installing the interphase shaft, make sure
that the cutting tips of the piercing set screws
do not protrude through the clamp.
With all pole-units in the closed position,
loosely fit the sections of interphase shaft
between the appropriate coupling assemblies.
Take care not to bring the switch “out of
toggle” when fitting the shaft sections into the
couplings. The interphase shaft should extend
slightly past the flange end of the clamp. See
Figure 22.
NOTICE
Shaft sections are cut to the appropriate
length at the fatory. Carefully examine
and measure all sections of shaft before
cutting any of the shaft sections. The
shaft sections can be trimmed using a pipe
cutter.
Although the shaft sections are cut to the
appropriate length at the factory, it may be
necessary to cut them in the field. With the
interphase shaft inserted into the coupling,
tighten the clamp bolts equally so that the clamp
pulls down evenly on the coupling.
Tighten the piercing set screws, piercing the
shaft and continue turning until a firm resistance
is felt. See Figure 23.
Continue connecting the remaining sections
of interphase shaft.
INSTALLATION
Flexible coupling plate
Coupling
flange
Attachment bolts
Figure 21. Attach the plate to the coupling flange.
Clamp bolts
Clamp
Interphase shaft
Figure 22. Insert the interphase shaft section between the couplings. Fasten
the clamp to the couplings.
Piercing set screws
Figure 23. Tighten the piercing set screws.

712-502 20
Installing the Mark VI CS-1A
Switch Operator and Vertical Shaft
Mount the switch operator to the user-furnished
structure as indicated on the erection drawing.
The structure supporting the switch must meet
the construction guidelines listed in S&C Data
Bulletin 712-60.
NOTICE
If more than one Mark VI CS-1A Switch
Operator is available at the installation
location, take care to select the one for this
particular installation.
Step 26
Unbolt the Mark VI CS-1A Switch Operator from
its shipping skid.
Step 27
Attach lifting slings around the output shaft
of the Mark VI CS-1A Switch Operator. See
Figure 24. Lift the operator into place on the
user-furnished mounting structure. Avoid
sudden starts and stops.
Step 28
Align the upper and lower flanges on the rear of
the operator with the user-furnished mounting
surface provided on the structure. Fasten the
operator to the structure using the ⁵⁄₈-inch
holes provided on the mounting flanges, as
shown in Figure 25. DO NOT remove the lifting
slings from the operator until the operator is
fully supported—using both flanges—by the
structure.
Step 29
Remove the lifting slings from the output shaft
of the switch operator.
INSTALLATION
Figure 24. Attach lifting sling to output shaft.
Lifting sling
Output shaft
Figure 25. Attach the Mark VI CS-1A Switch Operator mounting flanges
to the structure.
15ⴖ(381 mm)
3ⴖ(76 mm) 9ⴖ(229 mm)
34ⴖ(864 mm)
Lower flange
Upper
flange