S&C PMH-7 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-7 Specifications

General

Brand	S&C
Model	PMH-7
Category	Industrial Electrical
Language	English

Summary

Safety Information

Understanding Safety-Alert Messages

Explains signal words (DANGER, WARNING, CAUTION, NOTICE) and their meanings.

Following Safety Instructions

Advises users to adhere to procedures and seek assistance if needed.

Location of Safety Labels

Safety Precautions

Switching with Mini-Rupter® Switches

Operating the Mini-Rupter Switch

Detailed instructions for the proper operation of the switch.

Front Barriers

Fusing

Assembling the Fuse

Steps for installing fuse units into their respective holders.

Switching with Uni-Rupter® Interrupters

Installing and Closing the Fuse

Detailed procedure for inserting and closing fuses using specialized tools.

Opening and Removing the Fuse

Step-by-step guide for safely opening and removing a fuse.

Re-Fusing

How to Detect and Replace a Blown Fuse

Procedures for identifying blown fuses and replacing them.

Installing the Fuse in the Mounting

Refers to specific instructions for fuse installation.

Maintenance

Returning Equipment to Service

Appendix B

Appendix D

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