S&C PMH-9 User Manual

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

S&C PMH-9 Specifications

General

Voltage Rating (kV)	15.5
Continuous Current (Amperes)	600
Interrupting Rating (kA)	12.5
BIL (kV)	110
Number of Ways	3
Type	Switchgear
Operating Mechanism	Manual
Weight	Varies with configuration

Summary

Introduction

Qualified Persons

Defines requirements for personnel operating and maintaining equipment.

Proper Application

Safety Information

Understanding Safety-Alert Messages

Explains the meaning and importance of safety alert signals and words.

Location of Safety Labels

Identifies the location and types of safety labels on the equipment.

Safety Precautions

Enclosure Doors

Opening and Closing the Doors

Switching with Mini-Rupter® Switches

Operating the Mini-Rupter Switch

Instructions for the proper operation of the Mini-Rupter switch.

Front Barriers

Fusing

Assembling the Fuse

Steps for assembling S&C Power Fuses and current-limiting fuses.

Switching with Uni-Rupter® Interrupters

Installing and Closing the Fuse

Procedures for installing and closing fuses with Uni-Rupter Interrupters.

Opening and Removing the Fuse

Steps for safely opening and removing fuses from Uni-Rupter Interrupters.

Re-Fusing

How to Detect and Replace a Blown Fuse

Installing the Fuse in the Mounting

Procedures for installing fuses after replacement.

Maintenance

Returning Equipment to Service

Appendix D

Current-Limiting Fuses for Use in S&C PMH Pad-Mounted Gear