Manual PMH Pad-Mounted Gear
Outdoor Distribution (14.4 kV and 25 kV)
December 9, 2019
© S&C Electric Company 1978-2019, all rights reserved
Instruction Sheet 662-510
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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
. . . . . . . . . . . . . . . . . . . . . . . . . 7
Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Enclosure Doors
Opening and Closing the Doors . . . . . . . . . . . . . . . .10
Switching with Mini-Rupter® Switches
Operating the Mini-Rupter Switch . . . . . . . . . . . . . .12
Front Barriers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Fusing
Assembling the Fuse . . . . . . . . . . . . . . . . . . . . . . . .15
Installing the Fuse in the Mounting . . . . . . . . . . . . . .15
Switching with Uni-Rupter® Interrupters
Installing and Closing the Fuse . . . . . . . . . . . . . . . .16
A Note on Single-Pole Switching . . . . . . . . . . . . . . .19
Opening and Removing the Fuse . . . . . . . . . . . . . . 20
Re-Fusing
How to Detect and Replace a Blown Fuse . . . . . . . 23
Installing the Fuse in the Mounting . . . . . . . . . . . . . 23
Maintenance
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Returning Equipment to Service . . . . . . . . . . . . . . . 24
Enclosure Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix A
Dielectric Testing . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Appendix B
Ratings for S&C Mini-Rupter Switches . . . . . . . . . . 27
Ratings for S&C Power Fuses with
Uni-Rupter Interrupters . . . . . . . . . . . . . . . . . . . 27
Appendix C
Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Appendix D
Current-Limiting Fuses for Use in
S&C PMH Pad-Mounted Gear . . . . . . . . . . . . . . 31
Recommended Voltage Ratings . . . . . . . . . . . . . . . 32
