S&C PMH-6 - 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-6 Specifications

General

Nominal Voltage	15 kV
Maximum Voltage	15.5 kV
Continuous Current	600 A
Interrupting Current	12.5 kA
Frequency	60 Hz
Type	Pad-Mounted Gear
Rated Voltage	15 kV
Rated Interrupting Current	12.5 kA
Weight	Varies with configuration
Operating Mechanism	Manual

Summary

Introduction and Safety Guidelines

Qualified Persons and Proper Application

Defines qualified personnel and proper equipment application.

Safety Alerts and Precautions

Explains safety alert messages, labels, and general precautions.

Equipment Operation Procedures

Component Overview

Describes key components of the pad-mounted gear.

Enclosure Door Access

Step-by-step guide for opening and closing enclosure doors.

Switch and Fuse Operation

Procedures for operating switches and handling fuses.

Maintenance and Technical Data

Returning Equipment to Service

Procedures for safely returning equipment after maintenance.

Fuse Ratings and Selection

Information on fuse ratings, types, and selection criteria.