S&C Alduti-Rupter Programming manual

March 4, 2019
© S&C Electric Company 1998-2019, all rights reserved Instruction Sheet 761-507
S&C Alduti-Rupter®Switches
Outdoor Distribution (46 kV)
Three-Pole Double-Break Integer Style
Reciprocating Operating Mechanism
No Catalog Number Supplement
Installation and Operation
Table of Contents
Section Page Section Page
Introduction
Qualified Persons ........................... 2
Read this Instruction Sheet ................... 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Proper Application .......................... 2
Warranty .................................. 3
Warranty Qualifications ...................... 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
Shipping and Handling
Inspection ................................. 7
Packing ................................... 7
Handling .................................. 7
Installation
Mounting to Wood........................... 8
Preparing the Pole .......................... 8
Uncrating the Switch......................... 9
Lifting the Tiered-Outboard Mounting
Configuration Switch ...................... 9
Lifting Vertical Mounting Configuration Switch.....11
Installing Pipe Couplings with
Piercing Set Screws .......................13
Installing Vertical Operating Pipe ...............14
Installing Operating Handle ...................15
Checking Alignment .........................17
Installing Key Interlock .......................18
Checking Operation .........................19
Connecting High-Voltage Connectors .......... 23
Operation
Opening and closing the switch ............... 24
For switches with catalog number supplement "-R11," please refer to your local S&C Sales Office or to Instruction Sheet 761-513 on sandc.com.

2S&C Instruction Sheet 761-507
Introduction
Qualified Persons WARNING
Only qualified persons who are knowledgeable in the installation, operation, and
maintenance of overhead and underground electric distribution equipment, along
with all associated hazards, may install, operate, and maintain the equipment
covered by this publication. A qualified person is someone who is trained and com-
petent in:
• The skills and techniques necessary to distinguish exposed live parts from nonlive
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 special precautionary techniques, personal protective equip-
ment, insulated 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 proce-
dures for this type of equipment.
Read this
Instruction Sheet NOTICE
Thoroughly and carefully read this instruction sheet and all materials included in
the product’s S&C Instruction Handbook before installing or operating your S&C
Alduti-Rupter Switch. Familiarize yourself with the Safety Information and Safety
Precautions on pages 4 through 6. The latest version of this publication is available
online in PDF format at sandc.com/en/support/product-literature/.
Retain this
Instruction Sheet
This instruction sheet is a permanent part of your S&C Alduti-Rupter Switch. Designate
a location where you can easily retrieve and refer to this publication.
Proper Application WARNING
The equipment in this publication is only intended for a specific application. The
application must be within the ratings furnished for the equipment. Ratings for the
Alduti-Rupter Switch are listed in the ratings table in Specification Bulletin 761-31.
The ratings are also on the nameplate affixed to the product.
Figure 1. Switch nameplates with ratings.
Nameplate on
switch base
Nameplate on
operating handle
In most applications, Alduti-Rupter Switches are capable of switching rated continuous
load currents at full voltage. The ratings for the particular switch are listed on nameplates
attached to the operating handle and the switch. See Figure 1.
These interrupter switches are not intended for breaking fault currents.

S&C Instruction Sheet 761-507 3
Introduction
The warranty and/or obligations described in S&C’s Price Sheet 150 “Standard Conditions
of Sale – Immediate Purchasers in the United States” (or Price Sheet 153, Standard
Conditions of Sale – Immediate Purchasers Outside the United States) plus any special
warranty provisions, as set forth in the applicable product-line specication bulletin,
are exclusive. The remedies provided in the former for breach of these warranties shall
constitute the immediate purchaser’s or end user’s exclusive remedy and a fulllment of
the seller’s entire liability. In no event shall the seller’s liability to the immediate purchaser
or end user exceed the price of the specic product that gives rise to the 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 (or Price Sheet 153), 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 (OR PRICE SHEET 153) 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 (or PRICE SHEET 153.)
The standard warranty is applicable to the S&C Alduti-Rupter Switch detailed in this
instruction sheet except when it is power operated using a switch operator of other than
S&C manufacture.
Warranty
Warranty
Qualifications

Safety Information
4S&C Instruction Sheet 761-507
Understanding
Safety-Alert
Messages
Several types of safety-alert messages may appear throughout this instruction sheet and
on labels and tags attached to your S&C Alduti-Rupter Switch. Familiarize yourself with
these types of messages and the importance of these various signal words:
DANGER
“DANGER” identifies the most serious and immediate hazards that will likely result
in serious personal injury or death if instructions, including recommended precau-
tions, are not followed.
WARNING
“WARNING” identifies hazards or unsafe practices that can result in serious per-
sonal injury or death if instructions, including recommended precautions, are not
followed.
CAUTION
“CAUTION” identifies hazards or unsafe practices that can result in minor personal
injury if instructions, including recommended precautions, are not followed.
NOTICE
“NOTICE” identifies important procedures or requirements that can result in prod-
uct 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 Ofce or S&C Authorized Distributor. Their telephone numbers
are listed on S&C’s website sandc.com. Or call the S&C Global Monitoring and Support
Center at 1-888-762-1100.
NOTICE
Read this instruction sheet thoroughly and carefully
before installing your S&C Alduti-Rupter Switch.
Replacement
Instructions
and Labels
If you need additional copies of this instruction sheet, contact your nearest S&C Sales
Ofce, 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
S&C Instruction Sheet 761-507 5
Reorder Information for Safety Information
Location Safety Alert Message Description Part Number
ADANGER Electrocution Hazard 
BWARNING Piercing Set Screws G-3176R1
CWARNING Handle Operation G-4400R5
DWARNING Electrocution Hazard – Grounding Strap G-6596
G-6580-1 on tiered-outboard mounting configuration switch; G-6580-2 on vertical mounting configuration switch.
This part is a tag to be removed and discarded after the switch is installed and adjusted.
Location of Safety Labels
C
B
D
A

6S&C Instruction Sheet 761-507
Safety Precautions
DANGER
Alduti-Rupter Switches operate at high voltage. Failure to observe the precau-
tions below will result in serious personal injury or death.
Some of these precautions may differ from your company’s operating procedures
and rules. Where a discrepancy exists, follow your company’s operating procedures
and rules.
1. QUALIFIED PERSONS. Access to Alduti-Rupter
Switches 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
procedures and rules.
4. SAFETY LABELS AND TAGS. Do not remove or
obscure any of the “DANGER,” “WARNING,”
“CAUTION,” or “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. LOAD-INTERRUPTER SWITCH POSITION.
Always confirm the open/close position of load-
interrupter switches 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
maintain 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, swing the operating
handle through its full travel vigorously and without
hesitation. See the "Operation" section on page 24.

S&C Instruction Sheet 761-507 7
Shipping and Handling
Inspection
Examine the shipment for external evidence of damage as
soon after receipt as possible, preferably before removal
from the carrier’s conveyance. Check the bill of lading to
make sure the listed shipping skids, crates, and containers
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
Study the erection drawing carefully and check the bill of
materials to be sure all parts are at hand. When a standard
mounting arrangement is specied, the shipment includes:
• A three-pole interrupter switch complete with
interphase drive, factory assembled on a single base
(All switch adjustments, including that of the interphase
drive, are made at the factory to ensure proper operation
and simultaneity of opening and closing.)
• Three vertical operating-pipe sections (Switch may be
furnished “less operating pipe,” if specied.)
• Operating-mechanism components, such as handle, rod
guides, and couplings—each tagged and keyed to the
bill of material for ready identication
The components included with these modifications are
shown on the erection drawing bill of material under the
specified “-SX” suffix. They include:
-S1 One tubular fiberglass insulating section in vertical
operating shaft
-S2 One Cypoxy™ Insulator unit in vertical operating
shaft
-S6 Key interlock—single lock for a “locked-open”
application
-S6L Provision for key interlock—allows future addition
of single lock for “locked-open” application
-S7 Auxiliary contact switch with 4 N/O and 4 N/C
contacts (600 Vac, 20 A)
-S8 Provision for power operation of pole-mounted
switch by S&C Switch Operator—Type AS-10
-S9 Provision for power operation of steel-structure
or pedestal-mounted switches by S&C Switch
Operator—Type AS-10
-S16 Provision for power operation by S&C 6801M
Automatic Switch Operator
“-V1,” “-V2,” or “-V3” adds (one, two, or three respectively)
extra 6-foot-10-inch (208-cm) lengths of pipe and includes
the appropriate number of extra couplings and guides.
Reference drawing RD-10005, detailing the various
modifications, is included in addition to the erection
drawing.
Power Operation: If sufx “-S8” or “-S9” is specied,
S&C Instruction Sheets 769-510 and 769-511, “S&C Switch
Operators—Type AS-10,” are included with the switch
operator shipment. Instruction Sheets 769-510 and 769-
511 cover installation, operation, and adjustment of
the appropriate switch operator and should be used in
conjunction with this instruction sheet where applicable.
If sufx “-S16” is specied, associated S&C Instruction
Sheets for the 6801M Automatic Switch Operator are
included with the switch operator shipment. Not all
mounting arrangements are suitable for power operation;
consult the nearest S&C Sales Ofce for details.
Handling
The crate the switch is packed in is designed to be moved
and lifted using a lift truck. Raised slots in the bottom of
the crate are provided for a lift truck’s forks.
NOTICE
To minimize time-consuming final adjustments
after installation, make sure the switch poles are in
their fully Closed position during installation of the
interphase and vertical operating pipe sections. S&C
recommends tying the switch blades to their jaw
contacts with wire or a cable tie.
WARNING
DO NOT lift the switch by rigging on the “live parts” or
subject these parts to undue stress from slings or fall
lines.
Lifting the switch by the live parts will damage the
switch. Rough handling may cause damage to the
blades and contacts.
Failure to lift the switch properly can result in
switch damage, causing improper operation,
arcing or electrical shock.

8S&C Instruction Sheet 761-507
Installation
Mounting to Wood
NOTICE
When mounting to a wood structure, a spring-type
washer must be used between the square washer
and the nut to maintain fastener tightness in the
event of wood shrinkage. See Figure 2.
Preparing the Pole
STEP 1. Drill two -inch (21-mm) diameter holes
through the utility pole as shown, at the desired
height for mounting the switch. See Figure 3.
Refer to the erection drawing.
STEP 2. Insert a ¾-inch diameter through-bolt (not fur-
nished) into each hole as shown in Figure 4.
Loosely attach a square washer, spring washer
(when mounting to a wood utility pole), and nut
on each bolt.
Spring-type
washer
Spring-type
Figure 2. Applying the spring washer.
Figure 3. Drilling holes for the switch-mounting bracket.
Figure 4. Installing the through-bolts.
Square
washer
Nut
Spring washer
¾-inch
diameter
through-bolt
Approx. 3-inch
(76-mm)
projection
1316
diameter
typ.
Spring washer

S&C Instruction Sheet 761-507 9
Installation
Uncrating the Switch
STEP 3. Remove the switch from its crate. See Figure5.
Protect the bearings from contamination by dirt,
mud, oil, etc. If necessary, use blocks to keep the
bearings clear of the ground.
For tiered-outboard mounting configuration
switches proceed to Step 4 below.
For vertical mounting configuration switches
proceed to Step 9 on page 11.
Lifting Tiered-Outboard Mounting
Configuration Switch
STEP 4. To minimize time-consuming nal adjustments,
make sure the switch is fully closed. Tie the
switch blades to their stationary main contact
assemblies. See Figure 6.
STEP 5.
WARNING
DO NOT lift the switch by rigging to the live
parts. Avoid allowing the switch to swing
while lifting.
Lifting the switch by the live parts will dam-
age the switch. Rough handling may cause
damage to the blades and contacts.
Failure to lift the switch properly can result
in switch damage, causing improper opera-
tion, arcing, or electrical shock.
Hoist the switch using the two lifting eyes
attached to the top switch pole-unit base. See
Figure 7.
Unbolt the 4-inch (102-cm) x 4-inch (102-cm)
wood frame skid after the switch is hoisted to the
vertical position. This frame prevents damage to
the live parts of the bottom switch pole, as the
switch is being hoisted.
Figure 5. Uncrating the switch.
Figure 7. Hoisting the switch pole into position.
Figure 6. Tieing the switch blade to the main contacts.
4-inch (102-mm)
4-inch (102-mm)
wood frame skid

10 S&C Instruction Sheet 761-507
Installation
STEP 6. Guide the switch so the through-bolt heads enter
into the keyhole slot and open slotted hole in the
switch base. See Figure 8.
STEP 7. Slowly lower the switch until it just bears on the
through-bolts. Fully tighten the bolts. See Figure
9. Then remove the lifting slings.
STEP 8. Attach the pole bands to the switch base anchor
brackets using the J-bolts furnished. Use a
stiffening block under each nut. See Figure 10.
Use a ⅝-inch diameter lag bolt (not furnished)
to secure each pole band to the utility pole.
Proceed to “Installing Pipe Couplings with
Piercing Set Screws” on page 13.
Figure 8. Guiding the switch.
Figure 9. Bolting the switch.
Figure 10. Attaching the pole bands.

S&C Instruction Sheet 761-507 11
Installation
Lifting Vertical Mounting
Configuration Switch
STEP 9. To minimize time-consuming nal adjustments,
make sure the switch is fully closed. Tie the
switch blades to their stationary main contact
assemblies. See Figure 11.
STEP 10.
WARNING
DO NOT lift the switch by rigging to the live
parts. Avoid allowing the switch poles to
swing while lifting.
Lifting the switch by the live parts will dam-
age the switch. Rough handling may cause
damage to the blades and contacts.
Failure to lift the switch properly can result
in switch damage, causing improper opera-
tion, arcing, or electrical shock.
The switch will role somewhat more than
90 degrees as it clears the shipping skid.
Hoist the switch using the two lifting eyes
attached to the outboard switch pole-unit bases.
See Figure 12.
Unbolt the 4-inch (102-cm) x 4-inch (102-cm)
wood blocks attached to the switch base after the
switch is hoisted to the vertical position. These
blocks prevent damage to the lower live parts of
the switch, as the switch is being hoisted.
Figure 11. Tieing the switch blade to the main contacts.
Figure 12. Hoisting the switch into position.
4-inch (102-mm) 4-inch (102-mm) wood blocks

12 S&C Instruction Sheet 761-507
Installation
STEP 11. Guide the switch so the through-bolt heads
enter into the keyhole slot and open slotted hole
in the switch base. See Figure 13.
STEP 12. Slowly lower the switch until it just bears on
the through-bolts. Fully tighten the bolts. See
Figure 14. Then remove the lifting slings.
Figure 14. Bolting the switch.
Figure 13. Guiding the switch.

S&C Instruction Sheet 761-507 13
Installation
STEP 13. Attach the pole bands to the switch base anchor
brackets using the J-bolts furnished. Use a
stiffening block under each nut. See Figure 15.
Use a ⅝-inch diameter lag bolt (not furnished)
to secure each pole band to the utility pole.
Installing Pipe Couplings with
Piercing Set Screws
WARNING
Failure to properly install pipe couplings with pierc-
ing set screws can cause slippage of operating pipe,
resulting in improper operation of the switch, arcing,
equipment damage, or electrical shock.
To properly install piercing set screws:
1. Make sure the cutting tip of the piercing set screw does
not protrude through the body of the clamp.
2. Insert the operating pipe section into the coupling and
nger-tighten the clamp bolt(s).
3. Adjust the operating pipe to the correct length. Then,
tighten the clamp bolt(s) to nal tightness.
4. Tighten the piercing set screw, piercing the pipe, and
continue turning until a rm resistance is felt.
5. Make sure the clamp bolt(s) are tight.
See Figure 16.
Figure 15. Attaching the pole bands.
Piercing set screw in shipping position (cutting tip
does not protrude through body of the clamp)
Operating pipe installed, clamp bolt fully tightened,
and piercing set screw in final position
Clamp bolt
Clamp
Coupling body
Piercing
set screw
Slug pierced
from pipe
Figure 16. Installing the pipe couplings.

14 S&C Instruction Sheet 761-507
Installation
Installing Vertical Operating Pipe
STEP 14. One of the pipe sections furnished is threaded at
one end to accommodate the operating handle
assembly. See Figure 17. Install this section of
pipe last, with the threads at the lower end.
If only one vertical operating-pipe section is
required, proceed to Step 17.
STEP 15. Mount the rod guide(s) with the arm pointing
upward as shown in Figure 18.
When an adjustable rod guide is included
mount it nearest the switch.
STEP 16. Install the upper section of vertical operating
pipe between the switch drive lever and the
uppermost rod guide, with the rod-guide arm
pointing upward at a 45-degree angle. See
Figure19. (A positioning stud is furnished that
holds the rod guide at 45 degrees.) Follow the
directions in “Installing Pipe Couplings with
Piercing Set Screws” on page 13.
Torque the clamp bolts to final tightness.
Then, tighten the piercing set screws, pierc-
ing the pipe, and continue turning until a firm
resistance is felt.
If more than one rod guide is used, install
vertical operating-pipe sections between the rod
guides in the same manner.
Figure 19. Installing the upper operating pipe section into the
rod guide.
Figure 18. Attaching the rod guide.
Positioning
stud
Upper-
most
section of
vertical
operating
pipe
Figure 17. Threaded vertical operating pipe.

S&C Instruction Sheet 761-507 15
Installation
Installing Operating Handle
STEP 17. Mount the operating handle assembly as shown
on the erection drawing. At the same time, use
one of the mounting bolts to attach one end of the
ground strap (the end with the grounding
connector attached) to the handle mounting
plate.See Figure 20.
STEP 18. Install the lowest vertical operating-pipe sec-
tion by threading one end of the pipe into the
coupling on the operating handle assembly.
Approximately ¼ inch (6 mm) of thread should
extend through the coupling. Tighten the lock-
nut. See Figure 21.
If the shipment includes an S&C Type AS-10 Switch Operator, as sig-
nified by the addition of the standard minor modification suffix “-S8” or
“-S9” to the erection drawing number, refer instead to S&C Instruction
Sheet 769-510, “S&C Switch Operators—Type AS-10, Instructions for
Installation." If the shipment includes an S&C 6801M Automatic Switch
Operator, as signified by the addition of standard minor modification
suffix “-S16” to the erection drawing number, refer instead to S&C
Instruction Sheet 1045M-510.
The grounding recommendations described in this document may
differ from the standard operating and safety procedures of certain
electric utility companies. Where a discrepancy exists, the operating
procedures of the electric utility apply.
Figure 20. Mounting the operating handle.
Figure 21. Installing the lowest operating pipe section into the
operating handle assembly.

16 S&C Instruction Sheet 761-507
Installation
STEP 19. Insert the upper end of this pipe section in the
lowest rod guide or—if only one vertical oper-
ating-pipe section is used—the offset coupling
attached to the switch lever. While holding the
operating handle at a point approximately
20 degrees from the Closed position, torque the
rod guide (or switch lever) coupling clamp bolt.
See Figure 22.
NOTICE
Do not tighten the piercing set screw at the
top of the lowest section of vertical operat-
ing-pipe until satisfactory operating handle
adjustment is attained.
STEP 20. Fasten the free end of the grounding strap to the
lowest vertical operating-pipe section a few
inches above the operating handle assembly
with the U-bolt connector provided for this
purpose. See Figure 23. Then, connect the lower
end of the strap to a suitable earth ground, using
the grounding connector provided at that end of
the strap.
The grounding recommendations described in this document may
differ from the standard operating and safety procedures of certain
electric utility companies. Where a discrepancy exists, the operating
procedures of the electric utility apply.
Figure 22. Installing the lowest operating pipe section into the
rod guide.
Figure 23. Attaching the grounding strap.
Lowest section of
vertical operating pipe

S&C Instruction Sheet 761-507 17
Installation
Checking Alignment
STEP 21. Remove the ties holding the switch blades to
their stationary main contact assemblies. See
Figure 24.
Remove the 45-degree positioning stud from
each rod guide. See Figure 19 on page 14.
Open and close the switch slowly to ensure
no operational difficulties are encountered due
to undetected damage in shipping.
WARNING
Open and close the switch slowly ONLY
when checking alignment or making adjust-
ments to the de-energized switch.
When opening or closing an energized
switch, swing the operating handle vig-
orously through its full travel without
hesitation.
Arcing and damage to the switch will occur
if the energized switch is operated slowly or
left in the partially Open or Closed position.
STEP 22. Move the operating handle slowly to the Closed
position. See Figure 25. A denite resistance
should be felt at the end of the stroke, indicating
all slack in the operating linkage has been taken
up.
Figure 24. Removing the tie at the stationary main contact
assembly.
Figure 25. Verifying the slack has been taken up in the oper-
ating linkage.
Remove tie

18 S&C Instruction Sheet 761-507
Installation
STEP 23. If there is still slack, repeat the procedure in
Step 19 but move the operating handle more than
20 degrees in the opening direction before
torquing the clamp bolt on the lowest rod guide
(or switch drive lever) coupling. See Figure26.
Conversely, if considerable force is needed to
move the handle to the fully Closed position, or
if the handle does not swing 180 degrees to the
fully Open position, loosen the clamp bolt on
the lowest rod guide (or switch drive lever) cou-
pling, and move the handle to a position less than
20 degrees from the Closed position. Then torque
the clamp bolt on the lowest rod guide (or switch
drive lever) coupling. Proper “resistance” in the
operating linkage is essential to ensure positive
switch closure.
Recheck to be sure all clamp bolts and pierc-
ing set screws have been torqued to final tight-
ness.
If a key interlock is not used (standard minor
modification suffix “-S6”) proceed to Step 26 on
page 19.
Installing Key Interlock
STEP 24. The interlock group includes a Superior Type
B4003-1 Mk II single- or multiple-key interlock
(or equivalent), with zero bolt projection and
¾-inch (19-mm) bolt travel, locking disc, and
interlock bracket. If “provision only” is specied,
the interlock is not included.
Attach the key interlock to the interlock
bracket so the interlock bolt, when extended,
engages a slot in the locking disc on the operat-
ing handle. See Figure 27.
Figure 26. Torquing the clamp bolt at the lowest rod guide (or
switch operating lever) coupling.
Clamp bolt
Interlock bolt
Figure 27. Attaching the key interlock to the interlock bracket.

S&C Instruction Sheet 761-507 19
Installation
STEP 25. Block one of the two slots in the locking disc
with the blocking screw provided. (The slot to be
blocked depends on whether a locked-open or
locked-closed arrangement is required.) See
Figure 28.
NOTICE
Key interlocks are intended for proper
sequencing of switch operations; they are
not intended to provide security. The oper-
ating handle assembly includes a locking
bar for padlocking the switch in either the
open or closed position.
Checking Operation
STEP 26. Open and close the switch slowly through its
full travel.
CAUTION
The switch should be opened and closed
slowly only when checking for alignment
and complete closure.
When opening or closing the switch in ser-
vice, do not slow down or stop part way.
Arcing can occur if the switch is partially
open or partially closed.
Check to be sure that the following condi-
tions exist:
(a) With the operating handle as far as it will go in
the closing direction, both main contacts of each
switch pole are fully closed with the blade within
⅛-inch (3 mm) of the stop on the terminal base
casting. See Figure 29.
Blocking screw
Figure 28. Blocking the slot in the interlock disc.
Figure 29. Check that the blade is fully closed and within
⅛-inch (3 mm) of the stop on the terminal base casting.
≤ ⅛-inch (3 mm)
Main contacts fully closed

20 S&C Instruction Sheet 761-507
Installation
(b) With the operating handle as far as it will go in
the opening direction, the switch blades are 90
degrees from the Closed position. See Figure 30.
In the unlikely event that the above-described
conditions are not met, more switch blade travel
is required.
(c) Move the operating handle to its mid-position to
take the strain off the operating-pipe linkage and
loosen the two bolts that clamp the driven arm of
the adjustable rod guide. See Figure 31.
(d) Lengthen the driven arm of the adjustable rod
guide one step ( -inch (9 mm)) and retighten
the bolts. Lengthening the driven arm increases
switch-blade travel. Then readjust for full
operating handle travel as described on page 18.
(e) Repeat this procedure—lengthening the driven
arm of the adjustable rod guide in one-step
increments and readjusting for full operating
handle travel—until full switch-blade travel is
attained.
(f) When satisfactory travel adjustment of the
operating handle and switch have been attained,
torque the bolts on the driven arm of the
adjustable rod guide, and the clamp bolt on the
rod guide (or switch drive lever) coupling to nal
tightness. Then, tighten the associated piercing
set screw, piercing the pipe, and continue turning
until a rm resistance is felt.
NOTICE
After readjusting, be sure to retighten the
clamp bolt and piercing set screw on the
pipe coupling at the rod guide (or switch
driver lever) immediately above the operat-
ing handle and the clamp bolts on the
driven arm of the adjustable rod guide.
Figure 31. Lengthening the driven arm of the adjustable rod guide.
Driven arm
Figure 30. Checking that the switch blades are 90 degrees from
the Closed position.