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2    S&C Instruction Sheet 681-510

Introduction

Qualified Persons

 WARNING

Only qualified persons who are knowledgeable in the installation, operation, 
and maintenance of 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 before installing or operating 
Vista Underground Distribution Switchgear. Familiarize yourself with the safety 
information on page 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 Vista Underground Distribution Switchgear. 
Designate a location where you can easily retrieve and refer to it. 

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 this gear are listed on a ratings label at the front of the switchgear. See S&C 
Specification Bulletin 681-31 for more information.

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 specification 
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 fulfillment 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 specific 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).

Summary of Contents for Vista Series

Page 1: ...ns from Rapid Ambient Temperature Changes 8 Operation Pre Operation Checks 9 Operating from Closed to Open Position 11 Operating from Open to Grounded Position 12 Operating from Grounded to Open Posit...

Page 2: ...roper 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 this gear are...

Page 3: ...ot 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 und...

Page 4: ...Always Consider Circuits and Components Live G 6700 C DANGER Never Drill Into Tank Hazardous Voltage Contains Pressurized SF6 Gas G 6682 D DANGER Keep Away Hazardous Voltage Mr Ouch G 6699 E WARNING C...

Page 5: ...upter is grounded 7 BACKFEED Bushings cables load interrupter switches and fault interrupters may be energized by backfeed 8 DE ENERGIZING TESTING AND GROUNDING Before touching any bushings or compone...

Page 6: ...al or single pole load switching and fault interruption through 12 5 kA symmetrical for other possible ratings refer to the nearest S C Sales Office Fault interruption is initiated by a programmable o...

Page 7: ...en Manual operating handle Viewing window under the VOLTAGE indicator Trip indicators for single pole fault interrupters can be seen through the viewing window TRIP indicator for three pole fault inte...

Page 8: ...nal gas pressure gauge for Vista switchgear models rated 15 kV 12 5 kA sym short circuit that have catalog numbers ending with R1 suffix Green zone Red zone Green Yellow zone Orange zone Gauge Needle...

Page 9: ...isconnect switch blade through the viewing window See Figures 9 and 10 Also inspect the current carrying components inside the tank specifically for dislodged hardware signs of arcing and significant...

Page 10: ...Closed and Open positions Operation Selector Operation Selector Figure 12 Rotating the OPERATION selector out of the way Operating disk Operating disk STEP 3 If the OPERATION selector is blocking the...

Page 11: ...rrupter See Figures 15 and 16 STEP 4 When operating from the Closed to Open position the operating handle must be rotated all the way to the Stop position as shown on the label to open and recharge th...

Page 12: ...ndicator optionsuffix L1 or L2 as instructed under the Checking for Voltage Using Optional Voltage Indicator section on page 17 or use an alternate method STEP 3 Insert the manual operating handle int...

Page 13: ...pages 9 and 10 are completed STEP 2 Insert the manual operating handle into the notch of the operating mechanism STEP 3 Rotate the manual operating handle in the clockwise direction to a stop in the...

Page 14: ...ting handle into the notch of the operating mechanism STEP 3 Rotate the manual operating handle in the clockwise direction to a stop in the Closed position to close the load interrupter switch or faul...

Page 15: ...3 and 24 When operating from the Closed to the Open position the operating handle must be rotated all the way to the Stop position as shown on the label to recharge the mechanism See Figure 25 For thr...

Page 16: ...ctor and the left side hole of the locking collar See Figure 27 Locking In Closed Open or Grounded Position To lock a load interrupter switch or fault interrupter into position insert a padlock throug...

Page 17: ...window STEP 2 Test the VOLTAGE indicator complete voltage indication circuit and phasing circuit if furnished for proper operation as follows a Shine a flashlight approximately 4 inches 102 mm above t...

Page 18: ...test circuit If the dot or any of the flashing lightning bolts still do not appear the VOLTAGE indicator may be damaged Test for voltage using an alternate method See Figures 34 and 35 PHASE indicato...

Page 19: ...either There is no voltage at the bushing The VOLTAGE indicator is malfunctioning Flashing lightning bolt indicates presence of voltage at the associated bushing A blank LCD panel indicates an absence...

Page 20: ...40 c Place the other test probe on each of the phasing pins in turn of the two ways to be phased and measure the phase to ground voltage See Figure 38 d If the voltage measured at each phasing pin is...

Page 21: ...ting that the cables are in phase c Keep the test probe on Phasing Pin 1 of the second way and move the other test probe to Phasing Pin 2 of the first way Measure the phase to phasevoltage SeeFigure42...

Page 22: ...rrupterswitchandfault interrupter grounding means are removed STEP 2 Make certain the load interrupter switches and fault interrupters are in the correct positions Open or Closed STEP 3 If a pad mount...

Page 23: ...itches 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 by visual eviden...

Page 24: ...enclosure must be refinished by the user before the finish has weathered for example to match other equipment a special precaution must be taken The entire surface must be sanded to provide a tooth t...

Page 25: ...g or performance requirements for the switch gear A dc withstand design test is specified for new equip ment because the switchgear may be subjected to dc test voltage when connected to the cable The...

Page 26: ...0 Hertz Impulse BIL 12 15 5 95 30 15 24 27 125 40 20 36 38 150 40 20 The dc cable thumping voltage is 50 of the dc cable test voltage because of voltage doubling that will occur at the open end of the...

Page 27: ...1 Clamp the two current carrying probes of the resistance measuring device to the bushing conductors of the current carrying path to be measured See Figure 46 In this example the resistance is being t...

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