S&C Vista SD User manual

April 8, 2019
© S&C Electric Company 2019, all rights reserved Instruction Sheet 695-545
S&C Vista®SD Underground Distribution Switchgear
Outdoor Distribution (15 kV and 27 kV)
PMH and PME Configurations
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
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation
Manually Opening or Closing Visi-Gap Load-
Interrupter Switches and Visi-Gap Fault
Interrupters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Closing the Doors . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Resetting Visi-Gap Fault Interrupters . . . . . . . . . . . .13
Locking in Open or Closed Position . . . . . . . . . . . . .15
Checking for Voltage Using the Optional
Potential Indication Feature . . . . . . . . . . . . . . . . .16
Low-Voltage Phasing Using the Optional
Voltage-Indication Feature . . . . . . . . . . . . . . . . . .17
Maintenance
Inspection Recommendations . . . . . . . . . . . . . . . . .19
Inspecting Cable Terminations . . . . . . . . . . . . . . . . .19
Pad-Mounted Enclosure Finish . . . . . . . . . . . . . . . 20
Appendix A
Routine Switchgear Testing . . . . . . . . . . . . . . . . . . .21
Dc Cable Testing and Fault Locating . . . . . . . . . . . .21
Very Low Frequency (VLF) Cable Testing . . . . . . . 22
Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . 23
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2S&C Instruction Sheet 695-545
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
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 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
Vista SD Underground Distribution Switchgear. 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 Vista SD Underground Distribution
Switchgear. Designate a location where you can easily retrieve and refer to this publication.
Proper Application WARNING
The equipment in this publication must be selected for a specific application. The
application must be within the ratings furnished for the equipment. Ratings for the
Vista SD Underground Distribution Switchgear are listed in the ratings table in
Specification Bulletin 695-33. The ratings are also on the nameplate affixed to the
product.

S&C Instruction Sheet 695-545 3
Introduction
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.)
Warranty
Qualifications
The seller’s standard warranty does not apply to components not of S&C manufacture
that are supplied and installed by the purchaser or to the ability of the seller’s equipment
to work with such components.

4S&C Instruction Sheet 695-545
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 your S&C Vista SD Underground Distribution Switchgear.
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 Vista SD Underground Dis-
tribution Switchgear.
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.

S&C Instruction Sheet 695-545 5
Safety Information
Reorder Information for Safety Information
Location Safety Alert Message Description Part Number
ADANGER Keep Away–Hazardous Voltage (“Mr. Ouch”) G-6699
BDANGER Hazardous Voltage–Always Consider Circuits and Components Live... G-6700
CWARNING Voltage Tester–Always Test for Proper Operation G-9451
DWARNING Keep Out–Hazardous Voltage Inside G-6398
A
Location of Safety Labels and Tags
NOTE: Installation
and operation infor-
mation kit is stored
in a slot behind the
manual operation
handle to the left of
Way 1. Designate a
location where you
can easily retrieve it
and refer to it.
D D
Padlock
C
B
WARNING
KEEP OUT
Hazardous voltage inside.
Can shock, burn, or cause
death.
If open or unlocked,
immediately call electric
company.
G-6398
B
DANGER
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
sheets▲, 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.
▲Note: Additional instruction sheets are available free of charge from S&C by calling [phone].
G-6700
Figure 1. Location of safety labels — Model 431 (4-way) unit shown
A
DANGER
Hazardous voltage—more
than 4000 volts.
Will shock, burn, or cause
death.
• Qualified persons only.
• If open, immediately call
electric company.
G-6699-P
KEEP AWAY

Safety Precautions
6S&C Instruction Sheet 695-545
DANGER
S&C Vista SD Underground Distribution Switchgear operates at high voltage. Failure
to observe these precautions 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 the Vista SD
Underground Distribution Switchgear must be restricted
only to qualified persons.
2. SAFETY PROCEDURES.Always follow safe operating
procedures and rules. Always maintain proper clearance
from energized components.
3. PERSONAL PROTECTIVE EQUIPMENT.Always use
suitable protective equipment, such as rubber gloves,
rubber mats, hard hats, safety glasses, and arc-flash
clothing in accordance with safe operating procedures
and rules.
4. DOORS.High-voltage compartment doors must be
securely closed and latched with padlocks in place at all
times unless work is being performed inside the
enclosure.
5. KEY INTERLOCKS.Optional key interlocks, if furnished,
must be in place. Check the operating sequence of the
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.
6. OPENING DOORS.Do not apply any undue force when
attempting to open a door. The use of undue force may
damage the door-latching mechanism.
7. Safety Labels. Do not remove or obscure any of the
“DANGER,” “WARNING,” “CAUTION,” or “NOTICE ”
labels.
8. ENERGIZED BUSHINGS.Always assume the bushings
are energized unless proven otherwise by test, by visual
evidence of an open-circuit condition at the load-
interrupter switch or fault interrupter, or by observing that
the load-interrupter switch or fault interrupter is grounded.
9. BACKFEED.Bushings, cables, load-interrupter
switches, and fault interrupters may be energized by
backfeed.
10. GROUNDING.
• Vista SD switchgear must be connected to a suit-
able earth ground before energizing and at all times
when energized.
• The ground wire(s) must be bonded to the system
neutral, if present. If the system neutral is not pres-
ent, proper precautions must be taken to ensure the
local earth ground cannot be severed or removed.
• After the switchgear has been completely discon-
nected from all sources of power and tested for voltage,
properly ground the load-interrupter switches and
fault interrupters before touching any bushings or
components that are to be inspected, replaced,
serviced, or repaired.
11. LOAD-INTERRUPTER SWITCH OR FAULT-INTERRUPTER
POSITION.
• Always confirm the Open/Closed position of the
load-interrupter switch or fault interrupter by visually
observing the position of the isolating disconnect.
• The load-interrupter switch or fault interrupter may
be energized by backfeed.
• The load-interrupter switch or fault interrupter may
be energized in any position.
12. MAINTAINING PROPER CLEARANCE.Always
maintain proper clearance from energized components.

S&C Instruction Sheet 695-545 7
Components
S&C Vista SD Underground Distribution Switchgear
features load-interrupter switches and microprocessor-
controlled fault interrupters for the switching and
protection of 600-ampere main feeders and 200-
or 600-ampere taps, laterals, and sub-loops. These
elbow-connected components are encapsulated in an
environmentally friendly solid-dielectric insulating
material. Vista SD switchgear is available in ratings
through 27 kV and 16 kA symmetrical interrupting.
S&C Visi-Gap load-interrupter switches use a vac-
uum interrupter in series with a manually operated
two-position isolating disconnect for three-pole live
switching of 600-ampere three-phase circuits. Load-
interrupter switches comply with IEEE Standard 1247
and IEC Standard 62271-103. They feature an easy-to-
operate manual operating mechanism.
S&C Visi-Gap fault interrupters use a vacuum inter-
rupter in series with a manually operated two-position
isolating disconnect for three-pole load switching of
200- or 600-ampere circuits and fault interrupting through
16kA symmetrical at 15 kV and through 12.5kA symmetri-
cal at 27 kV. Fault interrupters comply with both IEEE
Standard C37.60 and IEC Standard 62271-111.
Load-interrupter switches and fault interrupters can
be directly opened and closed using the manual handle.
Opening and closing speed of the vacuum interrupters is
not dependent upon the speed with which the handle is
moved. Operating shafts are padlockable in either position.
Factory-installed and wired motor operators, to facili-
tate remote power operation of load-interrupter switches
and fault interrupters, are optionally available. They can
be decoupled from the operating mechanisms to permit
testing without changing the positions of the switches or
fault interrupters. The motor operators require a user-
furnished 100-240 Vac 50/60-Hz control power source;
they’re controlled from a hand-held, cable-connected
portable remote control pendant.
Easy-to-follow mimic bus and indicators on the front of
the switchgear convey the positions of the load-interrupter
switches and fault interrupters (and their isolating dis-
connects), and whether a fault interrupter has tripped on
a fault. The default color scheme is green for the OPEN/
RESET indicator and red for the CLOSED indicator. These
colors will be reversed (i.e., green for the CLOSED indi-
cator and red for the OPEN/RESET indicator) if catalog
number suffix “-J1” has been specified.
Large viewing windows provide a clear view of the iso-
lating disconnects, allowing operating personnel to easily
confirm the positions of the load-interrupter switches and
fault interrupters.
Load-interrupter switch terminals are equipped with
field-replaceable 600-ampere rated bushing adapters. Fault
interrupter terminals are equipped with 200-ampere rated
bushing adapters. Fault interrupters may be optionally
equipped with 600-ampere bushing adapters in lieu of
200-ampere bushing adapters. Bushing and bushing-well
adapter interfaces conform to IEEE Standard 386 and
accept all standard insulated connectors and inserts rec-
ognized by this standard.
The self-powered overcurrent control can be programmed
using a personal computer connected to the control
through a USB cable. The control features a variety of fuse
and relay time-current characteristic (TCC) curves that
comply with IEEE Standard C37.112.

8S&C Instruction Sheet 695-545
Components
Figure 2. S&C Vista SD switchgear PMH and PME configurations have the features and options needed to match user needs.
Model 431 (4-way) unit shown (Catalog Number Suffix 924313-E11).
Manual handle
Fault indicator viewing
window (optional)
Potential indication
feature (optional)
Overcurrent control
Operating mechanism
Visible open gap (isolating disconnect is
easy to see through large view windows)
Cable-centerline adapters
(optional) 600-A bushing adapters
Front of Switchgear
Rear of Switchgear
Cable-centerline adapters

S&C Instruction Sheet 695-545 9
Operation
Manually Opening or Closing Visi-Gap Load-
Interrupter Switches and Visi-Gap Fault
Interrupters
NOTICE
If the load-interrupter switch or fault interrupter
is equipped with a motor operator, refer to S&C
Instruction Sheets 695-520, “S&C Vista SD
Underground Distribution Switchgear: Installa-
tion and Operation of Vista SD Motor Operator,”
and 695-525, “S&C Vista SD Underground Dis-
tribution Switchgear: Vista SD Portable Remote
Control Pendant.”
STEP 1. To access the operation compartment, remove
the padlock from the gear.
STEP 2. Insert a pentahead socket wrench or tool (a hex-
head socket wrench or tool when catalog number
sufx “-N” is specied) into the latching
mechanism. Rotate the wrench or tool 60º
counterclockwise to unlatch the doors. See
Figure3.
NOTICE
Do not apply any undue force when attempt-
ing to open the hinged roof or a door. The
use of undue force may damage the latching
mechanism.
STEP 3. Open each door fully and latch the door holders.
See Figure 4.
STEP 4. To gain access to the termination compartment,
repeat Steps 1 through 3 to open the rear doors of
the enclosure.
Figure 3. To unlock the front doors, turn the pentahead socket
wrench 60° counterclockwise against spring resistance until a
"click" is heard and the wrench reaches its stop.
Figure 4. Using the door holder to hold the door open.
Door Holder (stored)
Door Holder (latched)

10 S&C Instruction Sheet 695-545
Operation
Figure 6. Pull the operating handle guide ring knob forward to move the guide ring into the active (down) position (a and b);
insert the handle through the guide ring and attach it to the shaft of the operating mechanism (c) and (d).
Figure 5. Storage location of the manual operating handle.
STEP 5. Retrieve the manual operating handle from its
storage location at the top-left side of the
switchgear assembly. See Figure 5.
STEP 6. Pull the knob forward at the top of the enclosure
entryway to move the manual operating guide
ring to the active (down) position. See Figure6(a)
and 6(b). Insert the manual operating handle
through the guide ring; attach the handle to the
shaft of the operating mechanism. See Figure
6(c), and 6(d).
Manual operating handle
(b)
(c) (d)
(a)

S&C Instruction Sheet 695-545 11
Operation
Figure 8. Indicators and mimic bus show the position of the load-
interrupter switch or fault interrupter.
Figure 7. Rotate the operating handle counterclockwise to open
(a), clockwise to close (b).
Figure 9. The visible-open gap (isolating disconnect) is easy
to see through large viewing windows.
STEP 7. To operate the load-interrupter switch or fault
interrupter, rotate the operating handle in the
appropriate direction rmly, and without
hesitation, all the way to the stops. See Figure 7.
(a) To open the load-interrupter switch or fault
interrupter, rotate the handle counterclockwise.
(b) To close the load-interrupter switch or fault
interrupter, rotate the handle clockwise.
The manual operating handle may be operated
from a variety of locations using a rope, a shotgun
stick, or by hand (illustrated).
STEP 8. Check the POSITION indicators to conrm the
load-interrupter switch or fault interrupter has
been operated successfully. See Figure 8
STEP 9. Conrm the position of the isolating disconnect
using the large viewing window. See Figure 9.
STEP 10. Return the manual handle to its storage
location, taking care to position the tether out
of the way.
(a) (b)

12 S&C Instruction Sheet 695-545
Operation
Closing the Doors
STEP 1. Lift the door holder up to allow the door to swing
closed. See Figure 10. Make sure the door holder
is placed back in the storage position to allow the
door to be fully closed. See Figure 11.
STEP 2. Repeat Step 1 for the right door.
STEP 3. Engage the left-door latching mechanism. See
Figure 12.
STEP 4. The right-hand door of the unit is equipped with
the Penta-Latch® Mechanism which 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 rmly push the door closed.
When the latch points are positively engaged, the
spring mechanism will trip to latch the door.
STEP 5. Insert padlock shackle through the hole in
padlock recess and lock the padlock. See
Figure 13.
STEP 6. Repeat Steps 1 through 5 for the doors on the
other side of the enclosure (if open).
Figure 10. Lift the door holder to allow the door to swing closed.
Figure 12. Left door latching mechanism engaged.
Figure 11. Door holder placed in the storage position to allow
the door to close.
Figure 13. Enclosure doors padlocked.

S&C Instruction Sheet 695-545 13
Figure 17. The isolating disconnect after the fault interrupter
has been opened and reset.
Figure 16. The POSITION indicator after the fault interrupter has
been opened and reset.
Figure 15. Resetting the fault interrupter after a fault.
Figure 14. The POSITION indicator after a fault has occurred. The
fault interrupter is open, and the isolating disconnect is closed.
Resetting Visi-Gap Fault Interrupters
STEP 1. Check the POSITION indicators to conrm the
fault interrupter has tripped. See Figure14.
STEP 2. Retrieve the manual operating handle from its
storage location. Attach the handle to the shaft
of the operating mechanism. Rotate the handle
counterclockwise rmly, and without hesitation,
all the way to the stops to reset the fault
interrupter. See Figure 15.
STEP 3. Check the POSITION indicators to conrm the
fault interrupter has been opened. See Figure 16.
STEP 4. Conrm the position of the isolating disconnect
using the large viewing window. See Figure 17.
STEP 5. Return the manual operating handle to its
storage location.
Operation

14 S&C Instruction Sheet 695-545
STEP 6. Repair the fault in accordance with your
company’s operating procedures and rules.
STEP 7. When you are ready to re-energize the circuit,
rotate the manual operating handle clockwise to
close the fault interrupter. See Figure 18.
STEP 8. Check the POSITION indicators to conrm the
fault interrupter is closed. See Figure19.
STEP 9. Conrm the position of the isolating disconnect
using the large viewing window. See Figure 20.
STEP 10. Return the manual operating handle to its
storage location.
Figure 18. Closing the fault interrupter.
Figure 19. The POSITION indicator after the fault interrupter
has been closed.
Figure 20. The isolating disconnect after the fault interrupter
has been closed.
Operation

S&C Instruction Sheet 695-545 15
Locking in Open or Closed Position
To prevent operation of a load-interrupter switch or
fault interrupter, insert a padlock through the operating
mechanism and the center hole in the locking collar. See
Figure 21.
Figure 21. The load-interrupter switches or fault interrupters
may be padlocked in either position.
Locked open
Locked closed
Operation

16 S&C Instruction Sheet 695-545
Checking for Voltage Using the Optional
Potential Indication Feature
WARNING
Before using the Potential Indication feature, always
test for proper operation. If the Potential Indication
feature is not operating properly, test for voltage using
an alternate method.
NOTICE
The Potential Indication feature uses a capacitor
voltage divider with a ratio of 2400:1. A line-to-neutral
voltage of 7.2 kV will read approximately 3.0 Vac on
the voltmeter. Accuracy of the Potential Indication
feature is approximately +/-8%.
STEP 1. Using water and mild soap, if necessary, clean
the surface of the operating mechanism front
panel around the Potential Indication feature.
Petroleum-based solvents should not be used on
or around Vista SD Underground Distribution
Switchgear.
STEP 2. Unscrew the aluminum cap covering the
Potential Indication feature. See Figure 22.
STEP 3. Attach a high-impedance true RMS-reading
voltmeter, set to read ac volts, between Test
Jacks 1, 2, or 3, and the neutral jack to read the
phase-to-neutral voltage, or between Test Jacks
1 and 2, 2 and 3, or 3 and 1, to read the phase-to-
phase voltage. See Figure 23. A reading on the
meter greater than 0.5 Vac indicates voltage is
present at the bushing. A reading on the meter
less than 0.5 Vac indicates there is no voltage at
the bushing. No reading on the meter means the
Potential Indication feature or the voltmeter
may not be operating properly. Check for voltage
using an alternate method.
Figure 23. Check for voltage.
Figure 22. The Potential Indication feature with the cover
removed.
Operation

S&C Instruction Sheet 695-545 17
Low-Voltage Phasing Using Optional Voltage-
Indication Feature
STEP 1. Using water and mild soap, if necessary, clean
the surface of the operating mechanism front
panel around the Potential Indication feature.
Petroleum-based solvents should not be used on
or around Vista SD Underground Distribution
Switchgear.
STEP 2. Unscrew the aluminum cap covering the
Voltage-Indication feature.
STEP 3. Using a high-impedance true RMS-reading
voltmeter, set to read ac volts, determine the
phase-to-neutral voltage for each phase of the
two ways to be phased as follows:
(a) Set the voltmeter for volts ac.
(b) Connect one of the test probes of the voltmeter to
the neutral jack of the way to be phased.
(c) Place the other test probe on each of the test
jacks, in turn, of the two ways to be phased and
measure the phase-to-neutral voltage. See
Figure 24 (a), (b), and (c).
(d) If the voltage measured at each test jack is greater
than 0.5 Vac and they are equal, proceed to
Step 4 on page 18.
(e) If the voltage measured at any of the test jacks is
less than 0.5 Vac, the phases are not energized
and phasing cannot be performed. If the voltages
measured are not equal, the voltmeter may not be
operating properly. Phasing should be performed
using an alternate method.
Figure 24. Measure the phase-to-neutral voltage of each phase
of each way to be phased.
Operation
(b)
(c)
(a)

18 S&C Instruction Sheet 695-545
Operation
STEP 4. Determine the phase-to-phase relationships of
the two ways to be phased as follows:
(a) Remove the test probe of the voltmeter from the
neutral jack.
(b) Place one of the test probes on Test Jack 1 of the
rst way and place the other probe on Test Jack 1
of the second way. Measure the phase-to-phase
voltage. When comparing the same phase of the
two ways, the voltage should be 0.5 Vac or less for
system voltages through 13.2 kV maximum, and
between 0.5 Vac and 1.0 Vac for system voltages
through 29 kV maximum, indicating the cables
are in phase. See Figure 25 (a).
(c) Keep the test probe on Test Jack 1 of the rst way
and move the other test probe to Test Jack 2 of
the second way. Measure the phase-to-phase
voltage. When comparing different phases of the
two ways, the voltage should be 1.7 to 2 times the
phase-to-neutral voltage measured in Step 3. See
Figure 25 (b).
(d) Keep the test probe on Test Jack 1 of the rst way
and move the other test probe to Test Jack 3 of
the second way. Measure the phase-to-phase
voltage. Again when comparing different phases
of the two ways, the voltage should be 1.7 to 2
times the phase-to-neutral voltage measured in
Step 3. See Figure 25 (c).
(e) Repeat Steps 4b through 4d for Test Jack 2 and
Test Jack 3 of the rst way.
(f) If all the phase-to-phase relationships are
correct, the cables are in phase and are properly
installed.
Figure 25. Measure the phase-to-phase relationships of the two
ways to be phased. When comparing the same phase of the two
ways, the voltage should be zero or close to zero, indicating the
cables are in phase. When comparing different phases of the two
ways, the voltage should be 1.7 to 2 times the phase-to-neutral
voltage measured in Step 3.
(a)
(b)
(c)

S&C Instruction Sheet 695-545 19
Maintenance
Inspection Recommendations
No mechanical maintenance is required for S&C Vista
SD Underground Distribution Switchgear. However,
occasional inspection and cleaning of the switchgear
and exercising of the load-interrupter switches and fault
interrupters is recommended. Refer to S&C Instruction
Sheet 695-590, “S&C Vista® SD Underground Distribution
Switchgear: Inspection Recommendations.”
DANGER
When access to the bushings on S&C Vista SD
Underground Distribution Switchgear is required for
inspection, service, or repairs, always observe the
following precautions. Failure to observe these pre-
cautions will result in serious personal injury or death.
1. Access to the switchgear must be restricted only to
qualified persons. See “Qualified Persons” on page 2.
2. Always follow safe operating procedures and rules.
3. Before touching any bushings, always disconnect
the load-interrupter switches and fault interrupters
from all power sources (including backfeed), test
for voltage, and properly ground.
4. Always assume the bushings are energized unless
proved otherwise by test or by visual evidence of an
Open-Circuit condition at the isolating disconnect.
5. Test the bushings for voltage using the Potential
Indication feature (if furnished) or other proper
high-voltage test equipment.
6. After the switchgear has been completely
disconnected from all sources of power and tested
for voltage, ground all load-interrupter switches
and fault interrupters.
7. Make sure the switchgear and pad-mounted
enclosure (if furnished) are properly grounded to
the station or facility ground. Do not return
equipment to service unless such grounds are
properly made.
Inspecting Cable Terminations
Cable terminations can be inspected visually or by using
a noncontact infrared thermometer to check temperature.
To remove cables or cable accessories, the enclosure shelf
will need to be removed. This can be done by clearing the
shelf of any items and unscrewing the hand bolts at the
four corners of the shelf. See Figure 26.
Figure 26. Location of the hand bolts on the shelf for shelf
removal (if necessary).
Hand bolts

20 S&C Instruction Sheet 695-545
Appendix A
Pad-Mounted Enclosure Finish
The responsibility for ensuring a finish protects the
enclosure lies with both the manufacturer and the user.
S&C Vista SD Underground Distribution Switchgear is
nished with the S&C Ultradur® Finishing System, which
provides lasting protection for the enclosure. To retain
this protection, the user should take periodic corrective
action as follows:
STEP 1. Touch up any penetration of the nish to bare
metal, such as scratches and abrasions caused
during shipping or by vandalism, to maintain the
original integrity. S&C touch-up nish and
primer are available in aerosol spray cans. Order
catalog number 999-080 for light gray nish,
9999-058 for olive green nish, 9991363-493 for
seafoam green, 9991363-488 for equipment
green, and 9999-061 for red-oxide primer. See
Figure 27. No other nish or primer is approved.
The area to be touched up should be cleaned to
remove oil and grease. Sand the area to remove
any traces of rust that may be present, and make
sure all edges are feathered before applying
primer.
STEP 2. Provide an occasional simple washdown—
similartowhatwouldbegiventoanautomobile—
to remove surface contaminants. Use any
ordinary mild household detergent solution.
In cases where the user must refinish the enclosure
before the finish has weathered, such as when matching
to other equipment, the user must take special precaution.
The entire surface must be sanded to provide a tooth to
bond the new coat to the unusually tough and smooth
S&C Ultradur Finish.
Figure 27. Refinish any scratches or abrasions with S&C
red-oxide primer and touch-up finish.