S&C PMH-5 - 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

Summary

Safety Information

Understanding Safety-Alert Messages

Explains the meaning of DANGER, WARNING, CAUTION, and NOTICE signal words.

Location of Safety Labels

Illustrates the placement of safety alert messages and labels on the pad-mounted gear.

Safety Precautions

Qualified Persons

Reiterates that only qualified persons may access pad-mounted gear.

Safety Procedures and PPE

Emphasizes following safe procedures and using appropriate personal protective equipment.

Safety Labels and Interlocks

Live Work Precautions

Covers terminal energization, backfeed, switch position, and clearance.

De-energizing, Testing, and Grounding

Outlines essential steps before working: disconnect, test for voltage, and ground.

Overview

Uni-Rupter Interrupter

Fault Fiter Fuse with Uni-Rupter

SML-20 Fuse with Uni-Rupter

Grappler Handling Tool

Introduces the handling tool used for various operations.

S&C Mini-Rupter Switch

Enclosure Doors

Opening and Closing the Doors

Provides step-by-step instructions for opening and closing the enclosure doors.

Switching with Mini-Rupter Switches

Operating the Mini-Rupter Switch

Details the procedure for operating the Mini-Rupter Switch.

Front Barriers

Explains the use and installation of dual-purpose front barriers with Mini-Rupter Switches.

Fusing

Assembling the Fuse

Instructions for installing S&C Power Fuses and current-limiting fuses.

Switching with Uni-Rupter Interrupters

Installing and Closing the Fuse

Provides detailed steps for installing and closing fuses using a Grappler tool.

Opening and Removing the Fuse

Details the procedure for opening and removing fuses using a Grappler tool.

Re-Fusing

How to Detect and Replace a Blown Fuse

Guides users on identifying blown fuses and the initial steps for replacement.

Installing the Fuse in the Mounting

Maintenance

Returning Equipment to Service

Outlines the procedures for safely returning equipment to service after maintenance.

Appendix B

Ratings for S&C Mini-Rupter Switches

Ratings for S&C Power Fuses with Uni-Rupter Interrupters

Appendix D

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

S&C PMH-5 Specifications