S&C PMH User manual

March 30, 2020
© S&C Electric Company 1995-2020, all rights reserved Instruction Sheet 663-500
Source-Transfer PMH Pad-Mounted Gear
Outdoor Distribution (14.4 kV and 25 kV)
With Micro-AT®Source-Transfer Control
Installation
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 .................................. 2
Safety Information
Understanding Safety-Alert Messages........... 3
Following Safety Instructions .................. 3
Replacement Instructions and Labels ........... 3
Location of Safety Labels ..................... 4
Safety Precautions ......................... 6
Overview................................... 7
Shipping and Handling
Inspection ................................. 8
Packaging ................................. 8
Storage ................................... 8
Handling .................................. 8
Installation
Access to the Interior ........................ 9
Placement.................................10
Cable Terminations..........................11
S&C Current Sensors ........................15
Fault Indicators .............................17
Completing the Installation ....................17
Dielectric Testing ...........................19

2 S&C Instruction Sheet 663-500
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
competent 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
equipment, 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
procedures 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 Source-
Transfer PMH Pad-Mounted Gear. Familiarize yourself with the Safety Information
and Safety Precautions on pages 3 through 5. 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 Source-Transfer PMH Pad-Mounted
Gear. 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.
Warranty 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.)
Introduction

S&C Instruction Sheet 663-500 3
Safety Information
Understanding
Safety-Alert
Messages
Several types of safety-alert messages may appear throughout this instruction sheet
and on labels and tags attached to the S&C Source-Transfer PMH Pad-Mounted Gear.
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
precautions, are not followed.
WARNING
“WARNING” identifies hazards or unsafe practices that can result in serious
personal 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
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 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 Source-Transfer PMH
Pad-Mounted Gear.
Replacement
Instructions
and Labels
If additional copies of this instruction sheet are needed, 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.

4 S&C Instruction Sheet 663-500
Safety Information
A
A
B
FF
C
E
C
D
D
Hazardous voltage—more than 4000 volts.
Failure to follow these instructions will likely
cause shock, burns, or death.
• ALWAYS consider all circuits and component
parts live until completely de-energized, tested,
grounded, and tagged or properly identified.
• Do not work on or near this equipment
unless you:
(1) Know and obey your employer’s work
rules and S&C’s instruction sheetsd (in
Compartment 1); and
(2) Know the hazards involved with this
high-voltage equipment.
• ALWAYS use proper personal protective
equipment, protective devices, and tools
suitable for the assigned task.
d Note: Additional instruction sheets are available free of charge
from S&C by calling [phone].
Ç
DANGER
G-6503R1
DANGER
KEEP AWAY
Hazardous voltage—more
than 4000 volts.
Will shock, burn, or cause
death.
•Qualiedpersonsonly.
•Ifopen,immediatelycall
electriccompany.
G-6500
WARNING
Do not leave barrier in this position
for more than one week.
Barrier damage could result
which can cause flashover and
injury. G-6399
WARNING
KEEP OUT
Hazardous voltage inside.
Can shock, burn, or cause
death.
If open or unlocked,
immediately call electric
company.
G-6398
DRAWING NO.
G-9137
DESCRIPTION DRAWING NO.
DUAL PURPOSE BARRIER LABEL AND CABLE TIE REMOVAL LABEL
15 & 25KV PMH
G-9137
PROPRIETARYSTATEMENT: THIS DOCUMENT AND ALL PREVIOUS ISSUES ARE THE SECRET AND CONFIDENTIAL PROPERTY OF S&C ELECTRIC COMPANY(“S&C”), 6601 NORTH RIDGE BOULEVARD, CHICAGO,ILLINOIS,
AND NEITHER RECEIPT NOR POSSESSION THEREOF INFERS OR TRANSFERS ANY RIGHT IN OR LICENSE TOUSE THIS DOCUMENT, THE SUBJECT MATTERTHEREOF, OR ANY DESIGN OR TECHNICAL INFORMATION
SHOWN THEREON, OR ANY RIGHTTO REPRODUCE THIS DOCUMENT OR ANY PARTTHEREOF. NEITHERTHIS DOCUMENT NOR ANY INFORMATION CONTAINEDTHEREIN MAY BE COPIED, REPRODUCED,OR OTHERWISE
USED OR DISCLOSED TO ANY OTHER PARTY WITHOUT FIRST OBTAININGTHE EXPRESS WRITTEN PERMISSION OF S&C. THIS DOCUMENT IS PROVIDED UNDER THE EXPRESS CONDITIONTHAT IT WILL BE HELD IN
CONFIDENCE BY THE RECIPIENT,THAT IT IS SUBJECTTO RETURN UPON DEMAND, AND THATIT WILL NOT BE USED IN ANY WAYDETRIMENTAL TO S&C.
SCALE MATERIAL:
S&C SPEC. NO.
DESCRIPTION
.004 WHITE VINYL W/ .001 MYLAR LAMINATION ACRYLIC
BASE ADHESIVE. S&C SPEC, MSP-0083
REVISIONS
FULL
NO. DATE NOTICE NO.
DRAWN BY FINISH:
S&C SPEC. NO.
DESCRIPTION
OTHER. SEE BELOW
000 1-17-05 84823
MN
CH. BY TYP. PMX MES
EFH. OPTION PMH
UNLESS OTHERWISE SPECIFIED:
DECIMAL DIMS TO BE !
.031
APP. BY NEXT
ASSEMBLY
PRODUCT
DESCRIPTION
FRACTIONAL DIMS TOBE !
AK
ANGLES TO BE !
DAT E
USED ON
WHEN CHECKED, BREAK ALL CORNERS g
1-17-05
WHEN CHECKED, REMOVEALL BURRS g
sS&C ELECTRIC COMPANY
G E N E R A L O F F I C E S • C H I C A G O
5.0
G-9137
.125
R. TYP
3.375
Specialists in Electric Power Switching and Protection
NOTICE
1.0
HANG THIS DUAL PURPOSE BARRIER
ON THE SWITCH BARRIER MOUNTING
ANGLE AND REMOVE THE CABLE TIES
FROM THE INTERPHASE BARRIERS
BEFORE ENGERGIZING THE SWITCH-
GEAR.
WHITE CHARACTERS ON
BLACK BACKGROUND
BLACK CHARACTERS ON
WHITE BACKGROUND
Location of Safety Labels
Doors
H

S&C Instruction Sheet 663-500 5
Safety Information
Reorder Information for Safety Labels
Location Safety Alert Message Description Part Number
ADANGER Hazardous voltage —more than 400 volts . . . G-6503
BDANGER Storage and handling of spare fuses G-5147-2R1
CDANGER Switches may be energized . . . G-6501
DDANGER Keep away. . . G-6500
EWARNING Do not leave barrier in this position . . . G-6399
FNOTICE Hang this dual purpose barrier . . . G-9137
GWARNING Live switching with Uni-Rupter . . . G-6369
HWARNING Keep out . . . G-6398
A
A
G
G
C
C
D
Hazardous voltage—more than 4000 volts.
Failure to follow these instructions will likely
cause shock, burns, or death.
• ALWAYS consider all circuits and component
parts live until completely de-energized, tested,
grounded, and tagged or properly identified.
• Do not work on or near this equipment
unless you:
(1) Know and obey your employer’s work
rules and S&C’s instruction sheetsd (in
Compartment 1); and
(2) Know the hazards involved with this
high-voltage equipment.
• ALWAYS use proper personal protective
equipment, protective devices, and tools
suitable for the assigned task.
d Note: Additional instruction sheets are available free of charge
from S&C by calling [phone].
Ç
DANGER
G-6503R1
DANGER
KEEP AWAY
Hazardous voltage—more
than 4000 volts.
Will shock, burn, or cause
death.
•Qualiedpersonsonly.
•Ifopen,immediatelycall
electriccompany.
G-6500
E
WARNING
Do not leave barrier in this position
for more than one week.
Barrier damage could result
which can cause flashover and
injury. G-6399

6 S&C Instruction Sheet 663-500
Safety Precautions
DANGER
S&C Source-Transfer PMH Pad-Mounted Gear operates 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, follow your company’s operating procedures and rules.
1. QUALIFIED PERSONS. Access to S&C Source-
Transfer PMH Pad-Mounted Gear must be restricted
only to qualified persons. See the “Qualified Persons”
section 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. Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or
“NOTICE” labels.
5. HIGH-VOLTAGE ISOLATION. Switch operators and
controls are isolated from high voltage in grounded,
metal-enclosed compartments. Access to these
components is controlled by padlockable covers,
which incorporate a nonremovable manual handle.
Other low-voltage components, such as meters,
selector switches, toggle switches, etc., are similarly
isolated.
6. TEST FOR VOLTAGE. Test for voltage using proper
high-voltage test equipment before touching any
device to be inspected, serviced, or repaired in the
high-voltage compartments.
7. ENERGIZED COMPONENTS. Always consider all
parts live until de-energized, tested, and grounded.
Voltage levels can be as high as the peak line-to-
ground voltage last applied to the unit. Units energized
or installed near energized lines should be considered
live until tested and grounded.
8. GROUNDING.
• Make sure the pad-mounted gear enclosure is
properly grounded to the station or facility ground.
• After the gear has been completely disconnected
from all sources of power and tested for voltage,
install suitable grounding cables in all compartments
before touching any device that is to be inspected,
replaced, serviced, or repaired in the high-voltage
compartments.
9. MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized
components.
10. SWITCH POSITION.
• Always confirm the Open/Close position of Mini-
Rupter® Switches by visually observing the position
of the switch blades.
• Switches may be energized by backfeed.
• Switches may be energized in any position.
11. PADLOCKS. Non-removable, manual handles in
high-voltage compartment doors and hinged-
padlockable covers, as well as hinged-bolted panels,
have provisions for padlocks that must be in place and
secured at all times unless work is being
performed inside the enclosure. Padlocks must be
installed and secured on manual switch operating
handles at alltimesunless theswitchis being operated.
12. KEY INTERLOCKS. Key interlocks (if applicable)
must be in place. Check the operating sequence of
key interlocks to verify proper sequencing. After the
switchgear is installed, destroy all duplicate keys or
make them accessible only to authorized persons so
the key interlock scheme will not be compromised.
Key interlocks are not security locks.
13. MECHANICAL CABLE INTERLOCKS. Mechanical
cable interlocks are provided to prevent access to
fuses unless the switch is open and to prevent
operation of stored-energy switch operators when the
enclosure door is open. Do not attempt to operate any
switch when the enclosure door is open. Periodically,
verify these interlocks are functional.
14. DO NOT APPLY UNDUE FORCE. Do not apply any
undue force when attempting to open a door. The use
of undue force may damage the door-latching
mechanism. If optional key interlocks are provided,
make certain the interlocks are in their correct
positions to allow door opening.
15. FUSE HANDLING.
• Make certain fuses are disconnected from all power
sources (including backfeed) before being inspected
or replaced.
• Always store fuses in a clean, dry location.
• Do not store end-fittings, holders, interrupting
modules, or fuses in termination compartments
unless the unit is equipped with the optional fuse-
storage feature (catalog number suffix “-E1,” “-E2,”
or “-E3”).
16. BACKFEED. Mini-Rupter Switches and fuses may be
energized by backfeed.

S&C Instruction Sheet 663-500 7
Overview
The following instructions are for installation of S&C
Source-Transfer PMH Pad-Mounted Gear equipped with
the Micro-AT Source-Transfer Control. This switchgear is
a totally self-contained switching and protection package
providing fault protection and fully automatic two-way
source transfer for critical loads requiring a high degree
of service continuity. Source-Transfer PMH models that
include the S&C Micro-AT Source-Transfer Control provide
programmed control of all switching functions associated
with automatic source transfer.
Refer to S&C Instruction Sheet 663-503 for instructions
regarding operation of Source-Transfer PMH Pad- Mounted
Gear. For instructions about field programming and opera-
tion of the Micro-AT control, refer to S&C Instruction Sheet
515-500. These instruction sheets, along with a catalog
dimensional drawing showing cable-locating and anchor-
bolt dimensions, are included in the “Installation and
Operation Information Kit” provided with the switchgear.
Wiring diagrams for the switchgear and associated options
are also provided in the kit. All personnel involved with the
installation and operation of the equipment should be thor-
oughly familiar with the contents of the information kit.
The catalog number stamped on the nameplates affixed
to the outside of the doors of the pad-mounted gear is suf-
fixed with letter-number combinations. These suffixes
indicate the inclusion of options, such as key interlocks
(catalog number suffix “-C5”). Refer to Specification
Bulletin 663A-31 for a complete listing of the available
options for the switchgear.

8 S&C Instruction Sheet 663-500
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 all 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 or damage.
Packing
S&C Source-Transfer PMH Pad-Mounted Gear is fastened
to a wood skid for shipment. Any components specied,
such as fuses, rell units, fuse holders, end ttings, etc.,
are packed separately and shipped within the enclosure
if they t.
At the first opportunity, remove all packing materials
(cardboard, paper, foam padding, etc.) from the outside of
the gear. This will prevent the finish from being damaged
by rainwater absorbed by the packing materials and will
also prevent wind-induced abrasion from loose cardboard.
Storage
S&C Source-Transfer PMH Pad-Mounted Gear should
installed and energized immediately. When the gear is
energized, voltage sensor secondary-burden resistors
generate sufcient heat to help prevent condensation in
the low-voltage control compartment. If the gear cannot be
installed immediately, store it in a clean, warm, dry room.
Handling
WARNING
When handling the gear with an overhead hoist,
observe standard lifting practices as well as the
following general instructions.
Failure to follow these precautions can result in injury
and equipment damage.
Follow these steps to lift and move the pad-mounted gear:
STEP 1. Make sure the lifting tabs are securely bolted to
the enclosure before lifting the gear.
STEP 2. Use 6-foot (183-cm) or longer hoist slings of
equal length to prevent overstressing the
enclosure during lifting.
WARNING
Because the side of the gear where the low-voltage
control compartment is located is heavier than the
other side, the gear will tilt when lifting.
Therefore, care must be taken when lifting the gear
to avoid injury and equipment damage.
STEP 3. Arrange the hoist slings to distribute the lifting
forces equally between the lifting tabs. See
Figure 1.
STEP 4. Avoid sudden starts and stops.
Figure 1. The hoist sling arrangement.
Low-voltage control
compartment

S&C Instruction Sheet 663-500 9
Installation
Follow these steps to install the pad-mounted gear:
Access to the Interior
STEP 1. To open the doors:Access to the interior of
S&C Pad-Mounted Gear and its low-voltage
control compartment is controlled by the S&C
Penta-Latch® Mechanism, which must be
opened with a pentahead socket wrench or tool,
except when hexhead actuators (catalog
number sufx “-B1” or “-B2”) are specied. The
latching mechanism is coordinated with the
provisions for padlocking so the mechanism
can be unlatched only after the padlock has
been removed, and the padlock can be installed
only after the door has been securely closed and
completely latched.
Use a pentahead socket wrench or tool (a
hexhead socket wrench or tool when catalog
number suffix “-B1” or “-B2” is specified) to
unlatch the Penta-Latch Mechanism by rotating
the actuator counterclockwise approximately
60 degrees against spring resistance until a dis-
tinct click is heard and the actuator reaches its
stop. See Figure 2. This single motion unlatches
the mechanism and recharges the latching
spring for the subsequent closing operation.
Pull the door open and secure it with the door
holder. See Figure 3.
NOTICE
Do not force the doors open. Forcing a door
can damage the latching mechanism.
If optional key interlocks are furnished,
correctly position the interlocks so the
doors can be opened.
Figure 2. To unlock the doors, turn the pentahead socket wrench
60° counterclockwise against spring resistance until a “click”
is heard and the wrench reaches its stop.
Figure 3. Using the door holder to hold the door open.
Door holder (stored)
Door holder (latched)
(a)
(b)

10 S&C Instruction Sheet 663-500
The left-hand door to the interior of the gear
is secured closed by a rotating latch and is
overlapped by the right-hand door, which is
equipped with the Penta-Latch Mechanism. The
left-hand door can be opened after opening the
right-hand door. Remove the tie wrap securing
it for shipment, and disengage the rotating latch
by rotating it upward. See Figure 4.
The left-hand door to the low-voltage control
compartment is secured closed by two captive
screws and is overlapped by the right-hand
door. This door can be opened after opening
the right-hand door and loosening the screws
securing it in place.
To close the doors:Close the left-hand door
and secure it as appropriate with the captive
screws or with the latch by rotating the latch
downward over the stop on the outer edge of the
door. See Figure 4. The right-hand door latches
automatically when the door is closed. To close a
door equipped with the Penta-Latch Mechanism,
place one hand at the midpoint of the door-front
near the edge and firmly push the door closed.
When the latch points are positively engaged,
the spring mechanism will trip to latch the door.
Pull outward on the cover of the Penta-Latch
Mechanism to verify the door has latched
securely. If it has not, use a pentahead (or hex-
head, when applicable) socket wrench or tool
to rotate the actuator counterclockwise until a
distinct click is heard and the actuator reaches
the stop. If the actuator will not rotate counter-
clockwise, the mechanism was already charged
for closing but was not closed properly. Close the
door again, making sure all latch points engage
completely and simultaneously. When the door
is securely latched, a padlock may be inserted
into the hasp.
Placement
STEP 2. At the installation site, remove all separately
packaged components shipped in the pad-
mounted gear enclosure and set them aside in a
protected area.
(a) Unbolt the enclosure from its skid and lift the
unit onto the mounting pad, observing the
precautions in the “Handling” section on page 8.
(b) Open the doors to the interior of the gear and
secure them with the door holders.
(c) Refer to the catalog dimensional drawing
furnished and verify the enclosure
compartments are positioned correctly and
the unit is properly aligned with respect to
the anchor bolts or ush anchors.
(d) If excess lengths of direct-buried cable are in
place and they must be fed into the enclosure
compartments as the unit is being lowered, the
doors must be opened (with door holders in
place) to allow any excess cable to feed over the
door stiles. If switch interphase and end barriers
(where applicable) are removed to facilitate this
procedure, note their position to ensure correct
reinstallation. It should not be necessary to
remove any upper barriers. Refer to Step 3 on
page 11 for instructions on removal of switch
barriers.
(e) Level the pad-mounted gear enclosure using
metal shims as required between the mounting
pad and the enclosure. Shim the enclosure until
the tops of the compartment doors are even.
Then, secure the enclosure to the pad using the
anchor brackets provided. See the anchor-bolt
detail on the catalog dimensional drawing. Make
sure all compartment doors open and latch
closed without binding. Binding indicates
enclosure distortion which must be corrected
with additional shimming.
Installation
Figure 4. Rotate the latch upward to disengage the left-hand
door, as shown above. To secure the left-hand door closed,
rotate the latch downward over the stop on the outer edge of
the door.
Door-latching
mechanism
disengaged

S&C Instruction Sheet 663-500 11
Cable Terminations
STEP 3. To facilitate makeup and connection of cable
terminations to switch terminals, switch
interphase and end barriers (where applicable)
can be removed by loosening the wing-head
screw that secures each barrier to the barrier-
support angle. Remove the tie wraps securing
the wing-head screws for shipment. The screw
will remain attached to the barrier, which is
supported at the switch frame by the barrier
guide. See Figure 5. Lift the barrier from the
guide and place it in a location where the barrier
will not be damaged.
STEP 4. Optional cable guides (catalog number sufx
“-M2” or “-M3”), if specied, include cable-
support brackets (packed separately) and
mounting angles (factory installed when an
optional base spacer, 12-inch (30.5-cm)
minimum, is specied; packed separately
otherwise). Using the hardware furnished,
attach the mounting angles (if packed
separately) to the tabs provided on the sidewalls
of the compartments and attach the cable-
support brackets to the angles. See Figure 5. Do
not remove the protective sheet from the saddle
of the bracket or install the cable wrap until
instructed to do so in Step 5 on page 13.
Figure 5. Side view of the switch showing the interphase barrier attachment points, terminal-pad connections, and installation of
the current sensors (furnished with the optional Overcurrent Lockout feature) and optional cable guides.
Installation
Barrier-support angle
Wing-head screw
Switch interphase barrier
Connect terminator (or
connector) to two uppermost
holes on switch terminal pad
when catalog number suffix
“-M2” or “-Y2” is specified
Offset spade-type
compression terminal
Cable terminator
Install current sensor using
plastic tie wraps
12-inch (305-mm)
min. base spacer or
cable pit (required if
catalog number
suffix “-M2” or “-M3”
is specified
Barrier guide
(not visible)
Current sensor
(furnished with
catalog number
suffix “-Y2”
Mounting angle and
cable-support bracket
(furnished with catalog
number suffix “-M2,”
catalog number suffix
“-M3” similar)
Concentric-neutral
ground wires
To ground bus
Barrier-support angle
Wing-head screw
Switch interphase barrier
Switch interphase barrier
to two uppermost
holes on switch terminal pad
holes on switch terminal pad
holes on switch terminal pad
Offset spade-type
compression terminal
Cable terminator
Concentric-neutral
ground wires

12 S&C Instruction Sheet 663-500
Figure 6. Minimum clearances that must be maintained when installing cable terminators.
Minimum clearance
from energized parts
to electrical ground:
6 (152) for 14.4 kV
7½ (191) for 25 kV
Minimum clearance
from energized parts
to barriers:
1 (25) for 14.4 kV
2¼(57) for 25 kV
Minimum clearance
from energized parts
to barriers:
½ (13) for 14.4 kV
1¼(32) for 25 kV
Minimum clearance
from energized parts
to electrical ground:
6 (152) for 14.4 kV
7½ (191) for 25 kV
Check clearances for
both normal and
alternate positions of
adapter
Dimensions in inches (mm)
Minimum clearance
from energized parts
to barriers:
1 (25) for 14.4 kV
2¼(57) for 25 kV
Minimum clearance
from energized parts
to barriers:
½ (13) for 14.4 kV
1¼(32) for 25 kV
Installation

S&C Instruction Sheet 663-500 13
STEP 5. Make up cable terminations following the cable-
terminator manufacturer’s instructions. While
the interior of S&C Pad-Mounted Gear is
protected from direct exposure to the elements,
the gear is inherently in an outdoor environment
and requires selection and application of cable-
terminating devices accordingly.
WARNING
Maintain proper clearances when
installing cable terminators. Failure to
maintain proper clearances can result in a
flashover, injury, and equipment damage.
To maintain the rated BIL, the following
minimum clearances are required. See
Figure 6 on page 12.
• From energized parts to electrical
ground: 6 inches (152 mm) at 14.4 kV;
7½inches (191 mm) at 25 kV.
• From energized parts to fiberglass-
reinforced polyester barriers: 1 inch
(25 mm) at 14.4 kV; 2¼inches (57 mm)
at 25 kV.
• From terminator skirts to fiberglass-
reinforced polyester barriers: ½inch
(13 mm) at 14.4 kV; 1¼inches (32 mm)
at 25 kV.
Terminations must incorporate adequate
leakage distance between the exposed
conductor and the stress-relief cone,
across a surface of non-tracking material.
A surface can be rendered non-tracking by
properly taping it with a suitable material.
Two-position cable-terminator adapters
are provided at the fuse hinge assemblies. See
Figure 7. These adapters can be placed in their
alternate positions when required for increased
clearance from energized parts to grounded
parts of the cable terminators.
Switch terminal pads are furnished with
three mounting holes. In general, cable termina-
tors may be connected to the two lower holes in
the switch terminal pads. However, if the pad-
mounted gear includes optional cable guides for
switch terminals (catalog number suffix “-M2”)
or current sensors (catalog number suffix “-Y2”),
cable terminators must be connected to the two
uppermost holes in the switch terminal pads.
See Figure 5 on page 11.
Figure 7. The fuse assembly showing the alternate arrangement
of the two-position cable-terminator adapters.
Normal position for
maximum cable
terminating height
Alternate position
for use when
required for
electrical clearance
NOTICE
When connecting cable terminators,
avoid placing any intentional strain on
switch or fuse terminals. Do not use the
connecting bolts to pull the cables into
alignment. Place each connector flat
against the corresponding switch or fuse
terminal pad with the bolt holes aligned.
Failure to follow these precautions can
cause misalignment of the switch or fuse.
Installation

14 S&C Instruction Sheet 663-500
STEP 6. Before connecting the cable terminators to the
aluminum terminal pads, thoroughly wire-
brush aluminum contact surfaces to remove
any dirt or foreign materials as well as natural
surface oxides. Immediately coat both contact
surfaces to ½-inch (13 mm) beyond the joint
with a uniform layer of Penetrox® A. Then,
make the connections as follows. See Figure 8:
For aluminum connectors:Use ½-inch
aluminum or galvanized steel hardware with
two Belleville spring washers (not furnished) as
shown in Detail A of Figure 8. Before tightening
the connecting bolts, complete the installation
of optional cable guides (where applicable) by
following the cable-support manufacturer’s
instructions. Torque aluminum bolts to the
manufacturer’s specifications. Torque steel
bolts to 50 foot-pounds (67.79 N-m) or, in the
absence of a torque wrench, tighten each bolt
until the Belleville washers are flat. Then, back
off one-half turn. Do not use lockwashers with
Belleville washers.
For tinned copper or tinned bronze
connectors●:Use ½-inch galvanized steel
hardware with one Belleville spring washer (not
furnished) against the aluminum terminal pad
and one galvanized steel flat washer against
the tinned connector as shown in Detail B of
Figure 8. Before tightening the connecting
bolts, complete the installation of optional cable
guides (where applicable) following the cable-
support manufacturer’s instructions. Torque
the bolts to 50 foot-pounds (67.79 N-m) or, in the
absence of a torque wrench, tighten each bolt
until the Belleville washer is flat. Then, back
off one-half turn. Do not use lockwashers with
Belleville washers.
●The use of untinned copper or bronze connectors is not recommended.
Figure 8. The terminal-pad connections.
Installation
Detail B
Belleville
spring
washers
Aluminum
terminal pad
Aluminum
connector
Belleville
spring
washer
Tinned copper
or tinned bronze
connector
Aluminum
terminal pad
Galvanized steel
flat washer
Detail A
Aluminum
Belleville

S&C Instruction Sheet 663-500 15
Installation
WARNING
Low-voltage wiring routed inside the pad-mounted
gear enclosure must be a minimum of 6 inches
(152 mm) at 14.4 kV and 7½ inches (191 mm) at
25 kV away from components that will be energized
at high voltage. Do not place wiring where it might
fall onto a component that will be energized at high
voltage, such as the bus, or where it will be in the
way of moving parts.
Failure to maintain proper clearance can result in a
flashover, injury, and equipment damage.
NOTICE
Openings made into the low-voltage control
compartment must be sealed with a suitable
compound to prevent the entry of moisture or
animals. Failure to properly seal the openings can
result in damage to the electronic components.
NOTICE
Do not install the current sensors on unshielded
cables or on cables where the insulation is exposed
but ungrounded (for example, where dielectric tape
or heatshrink tubing is used). These current sensors
are intended for application at ground potential and
can be damaged by the voltage gradient between
the cable insulation and ground.
NOTICE
Twelve current sensors are required for source-
transfer pad-mounted gear furnished with optional
switch-terminal adapters (catalog number suffix
“-M1”) that permit two cables per phase. Install
the current sensors in accordance with the wiring
diagram provided.
The automatic source-transfer scheme will not
operate properly when only six current sensors are
installed.
S&C Current Sensors
STEP 7. Six S&C Current Sensors (packed separately)
are provided for units furnished with the
optional Overcurrent Lockout feature
(catalog number sufx “-Y2”). The leads from
thecurrentsensors in eachswitch compartment
must be connected to a terminal block located
in the associated terminal-block compartment,
behind the bolted panel labeled “Terminal
Blocks.” See Figure 9.
The bottom plate in each terminal-block
compartment is removable to facilitate drill-
ing an entrance hole for the lead wires. When
conduit is not used, protect the lead wires from
abrasion against the knockout opening with
a rubber grommet or by taping. Then, apply a
suitable compound to fill the space between the
lead wires and the opening to prevent entry of
moisture or animals.
Figure 9. The left side of the low-voltage control compartment
showing the left terminal-block compartment (the right
terminal-block compartment is similar) for connection of
leads from S&C Current Sensors furnished with the optional
Overcurrent Lockout feature (option suffix “-Y2”); and for
customer connections when optional auxiliary switches (suffix
“-C9” or “C10”), the Remote Indication feature (option suffix
“-Y4”), or the Supervisory Control feature (option suffix “-Y6”)
is furnished. Terminal blocks for options “-Y4” and “-Y6” are in
the left terminal-block compartment only.
Termination-block
compartment

16 S&C Instruction Sheet 663-500
Installation
STEP 8. Refer to the applicable wiring diagram and
make the appropriate connections from the
current sensors (with polarity marks on top) to
the terminal blocks. Then, attach each current
sensor to its associated high-voltage cable as
follows:
(a) Remove the ¼—20 gap nut on the current sensor.
With polarity marks on top, open the current
sensor and place it around the appropriate high-
voltage cable. Then, replace and securely tighten
the gap nut.
(b) Secure the current sensor to the high-voltage
cable at a point below the cable terminator or
stress cone using the plastic wire ties furnished.
See Figure 10. The current sensor may be placed
against the cable grounded concentric neutral
and the concentric neutral must be brought back
through the sensor or it may be placed against
the cable semiconducting jacket and the
terminator drain wire must be brought through
the sensor.
Note: The terminal blocks furnished with the optional
auxiliary switches (catalog number suffix “-C9” or “-C10”),
optional Remote Indication feature (catalog number
suffix “-.Y4”), or optional Supervisory Control feature
(catalog number suffix “-Y6”) are also located in the
terminal-block compartments. Refer to the applicable
wiring diagram and make the connections as required.
STEP 9. Connect the cable concentric-neutral ground
wires and ground pads inside the pad-mounted
gear enclosure to the system ground facility in
accordance with the user’s standard grounding
practice. Use the equivalent of 4/0 copper cable
(or cable sized in accordance with the user’s
standard practice) in either a single or multiple
connection to realize the maximum momentary
rating of the gear. For a multiple connection,
cables smaller than 1/0 copper or equivalent
should not be used.
Figure 10. The typical method for attaching an S&C Current Sensor to high-voltage cable.
Terminator drain
wire must be
brought through
the sensor
Conductor concentric
neutral must be brought
back through the sensor
Sensor above the cable
grounded concentric neutral
Sensor around the cable
grounded concentric neutral
Output terminals
(not visible)
S&C Current
Sensor
¼–20 gap nut
Wire ties
Lead wires
Output terminals
S&C Current

S&C Instruction Sheet 663-500 17
Installation
Fault Indicators
STEP 10. Optional mounting provisions for fault
indicators (catalog number sufx “-F1” or “-F2”)
are available. Fault indicators are to be
furnishedbytheuserandinstalledinaccordance
with the manufacturer’s instructions. If
mounting provisions are specied, mount the
fault indicators on the mounting brackets and
attach the associated sensors to the cables
below the cable terminators.
Completing the Installation
STEP 11. Optional surge arresters (catalog number
sufxes “-N6” through “-N10”) and optional
mounting provisions for base-mounted surge
arresters(catalognumbersufxes“-P1”through
“-P5”) are available. These options include
mounting provisions, surge arresters (when
specied), and hard-drawn copper connectors
to connect the surge arresters to the terminal
pads of the Mini-Rupter Switch.
Install and connect surge arresters in accor-
dance with the manufacturer’s instructions.
WARNING
Always use the hard-drawn copper
connectors provided to connect the surge
arresters to the Mini-Rupter Switch. Do not
use flexible leads. Use of flexible leads can
result in a flashover, injury, and equipment
damage.
STEP 12. If any switch interphase or end barriers (where
applicable) were removed to facilitate cable
termination, reinstall them now. Position the
rear of each barrier in the appropriate support
notch of the barrier guide mounted on the base
of the Mini-Rupter Switch. Then, tighten the
wing-head screw of the barrier securely to the
barrier-support angle at the front of the switch
compartment. Make sure the clearance from
the barriers to energized parts and from the
barriers to terminator skirts conforms to the
minimum dimensions specied in Step 5 on
page 13.
WARNING
Verify the rear of each switch barrier is
correctly positioned in its support notch
on the switch frame and the front of
the barrier is securely fastened to the
barrier-support angle. Failure to properly
reinstall the switch barriers will reduce the
clearance between the barriers and
energized parts or terminator skirts,
and can result in a flashover, injury, and
equipment damage.
STEP 13. Check functional operation of key interlocks, if
furnished.
WARNING
An extra set of keys is provided with
pad-mounted gear that has optional key
interlocks. These keys are for use only
during installation. After installation,
either: (1) destroy the extra set of keys or
(2) make them accessible only to authorized
persons. This will maintain the integrity of
the key-interlock scheme.
Note: Key interlocks are not security locks
and are not a substitute for padlocks.
NOTICE
Do not force doors open. Forcing a door
can damage the latching mechanism.
If optional key interlocks are furnished,
correctly position the interlocks so the
doors can be opened.
STEP 14. Make sure the doors open and close without
binding and the shimming of the pad-mounted
gear enclosure is adequate. A resilient closed-
cell gasket on the bottom ange of the enclosure
protects the nish from being scratched during
installation and isolates it from the alkalinity of
the concrete foundation. This gasket also helps
seal the enclosure to the foundation and guard
against entry of rodents, insects, or weeds.

18 S&C Instruction Sheet 663-500
Installation
If the gasket does not compensate for an
uneven foundation, grout the bottom of the
enclosure as necessary. The grout should be
recessed enough to permit caulking. To com-
plete the installation, caulk around the bottom
of the enclosure with a weatherproof compound
applied with a standard caulking gun. A room-
temperature vulcanizing (RTV) silicon-rubber
compound is recommended. Apply a suitable
compound to fill the spaces between the cable
and the conduit, and cap all empty conduits to
prevent the entry of moisture or animals.
STEP 15. Follow this procedure before leaving the site:
(a) Remove the lifting tabs and replace the bolts to
plug the blind-tapped holes.
(b) Check the interior of the pad-mounted gear.
Remove all foreign materials and tools that may
have been mislaid, and sweep the interior clear of
debris.
(c) Remove the tie wraps securing the dual-purpose
barriers to the inside of the door.
(d) Wipe barriers, insulators, switches, fuses, and
terminators clean with a mineral-spirits solvent
and dry with a clean cloth.
(e) Hang dual-purpose front barriers in their normal,
suspended positions. Also install optional inner
barrier panels, if furnished.
WARNING
Do not leave dual-purpose front
barriers in the “slide-in” position for more
than one week. These barriers are
intended for temporary use in the “slide-in”
position while work is being performed. If the
barriers are left in this position for an
extended period of time, there is the
possibility of corona discharge to the
barriers.
Prolonged exposure to corona discharge
can damage the barriers and result in a
flashover, injury, and equipment damage.
(f) Store spare SMU-20® Fuse Units or SM-4® Rell
Units (as applicable) in the fuse-storage racks
inside the fuse-compartment doors. Storage for
Fault Fiter® Electronic Power Fuses or current-
limiting fuses cannot be provided in these racks.
(g) Wipe down the exterior of the enclosure with a
clean, damp cloth. To preserve the integrity of
the surface, renish any scratches or abrasions
with S&C touch-up nish and red-oxide primer,
which are available in aerosol spray cans. Order
catalog number 9999-058 for olive-green nish,
9999-080 for light gray nish, and 9999-061 for
red-oxide primer. No other nish or primer is
approved. The area to be touched up should be
cleaned to remove all oil and grease. Sand the
area, removing any traces of rust that may be
present, and make sure all edges are feathered
before applying primer.
(h) Labels indicating the area around the pad-
mounted gear must be kept clear so work on the
gear can be done safely are provided. These
labels (or equivalent labels) should be afxed to
the exterior of the gear.
(i) Refer to Instruction Sheet 663-503 for
instructions about installing and closing the
fuses.
NOTICE
When installing and closing a fuse, use an
S&C Grappler™ Handling Tool attached to a
suitable universal pole to ensure
complete fuse closure is attained. Failure to
completely close the fuse can result in
damage to the Uni-Rupter® Interrupter
Switch when the gear is energized.
When the installation is completed, refer to the
applicable S&C instruction sheets for operating instruc-
tions regarding the pad-mounted gear and source-transfer
control.

S&C Instruction Sheet 663-500 19
Dielectric Testing
When high-voltage dielectric tests will be performed on
S&C Source-Transfer PMH Pad-Mounted Gear, special
precautions should be taken to prevent damage to the
voltage sensors and voltage limiters. Refer to S&C
Instruction Sheet 591-500.