February 13, 2017
© S&C Electric Company 2014-2017, all rights reserved
Instruction Sheet 695-510
S&C Vista
®
SD Underground Distribution Switchgear
Outdoor Distribution (17.5 kV and 29 kV)
With Visi-Gap
®
Load
Interrupter Switches and
Visi-Gap
®
Fault Interrupters
Operation
Table of Contents
Section
Page
Section
Page
Introduction
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . . . 2
Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . . 2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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 and Tags
Single-Way Vault-Mounted Style . . . . . . . . . . . . . . . . 5
Multi-Way Vault-Mounted Style . . . . . . . . . . . . . . . . . 6
Pad-Mounted Style . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Precautions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation
Manually Opening or Closing Visi-Gap Load-Interrupter
Switches and Visi-Gap Fault Interrupters
Vault-Mounted Style . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pad-Mounted Style . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Closing the Doors and the Hinged Roof . . . . . . . . . . . . 14
Resetting Visi-Gap Fault Interrupters (All Styles) . . . . . 15
Locking in Open or Closed Position . . . . . . . . . . . . . . . 17
Checking for Voltage Using the Optional Potential
Indication Feature . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Low-Voltage Phasing Using the Optional Voltage-
Indication Feature . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Inspecting Cable Terminations . . . . . . . . . . . . . . . . . . . 21
Pad-Mounted Enclosure Finish . . . . . . . . . . . . . . . . . . . 22
Replacing the Enclosure Latch Shear Pin . . . . . . . . . . 23
Closing and Securing the Enclosure If Replacement
Shear Pin is Unavailable . . . . . . . . . . . . . . . . . . . . . 24
Appendix A
Routine Switchgear Testing . . . . . . . . . . . . . . . . . . . . . . 25
Dc Cable Testing and Fault Locating . . . . . . . . . . . . . . . 25
Very Low Frequency (VLF) Cable Testing . . . . . . . . . . . 26
Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . . . . 27
Appendix B
Vista SD Underground Distribution
Switchgear Ratings . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ratings for S&C Visi-Gap Load-
Interrupter Switches . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ratings for S&C Visi-Gap Fault Interrupters . . . . . . . . . 28
Appendix C
Switchgear Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Appendix D
Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Appendix E
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Appendix F
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
USB Cable Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Appendix G
Touch-Up Kit Components . . . . . . . . . . . . . . . . . . . . . . 34
Appendix H
Auxiliary Contacts Receptacle Connector . . . . . . . . . . . 34
