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S&C PMH Series - User Manual

S&C PMH Series
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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
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S&C PMH Series Specifications

General IconGeneral
BrandS&C
ModelPMH Series
CategoryIndustrial Electrical
LanguageEnglish

Summary

Introduction to PMH Pad-Mounted Gear

Qualified Persons for Operation

Defines the qualifications required for personnel operating the pad-mounted gear.

Instruction Sheet Reading Guidelines

Emphasizes the importance of reading and understanding the instruction sheet before installation or operation.

Instruction Sheet Retention

Advises users to retain the instruction sheet for future reference.

Proper Application of Equipment

Details the specific intended applications for the pad-mounted gear.

Warranty Qualifications and Limitations

Outlines the conditions and limitations of the product warranty.

Safety Information and Alerts

Understanding Safety Alert Messages

Explains the meaning and importance of various safety alert messages and signal words.

Following Safety Instructions

Stresses the necessity of adhering to all safety procedures and instructions.

Location of Safety Labels

Identifies the locations of critical safety labels on the equipment.

Comprehensive Safety Precautions

General Safety Precautions

Lists essential safety precautions for operating high-voltage pad-mounted gear.

Product Overview

Enclosure Door Operation

Opening and Closing the Doors

Detailed steps for safely opening and closing the enclosure doors.

Switching with Mini-Rupter Switches

Operating the Mini-Rupter Switch

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

Front Barriers for Mini-Rupter Switches

Information on the use and handling of front barriers for safety.

Fuse Installation and Handling

Assembling the Fuse

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

Installing the Fuse in the Mounting

Procedure for installing fuses into their respective mountings.

Switching with Uni-Rupter Interrupters

Installing and Closing the Fuse

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

Note on Single-Pole Switching

Guidance on minimizing ferroresonant overvoltages during single-pole switching.

Opening and Removing the Fuse

Instructions for safely opening and removing fuses.

Re-Fusing Procedures

Detecting and Replacing a Blown Fuse

Methods for identifying and replacing blown fuses.

Installing Fuses After Re-Fusing

Procedure for installing fuses back into the mounting.

Equipment Maintenance

Component Maintenance

General guidelines for maintenance of pad-mounted gear components.

Returning Equipment to Service

Steps required to safely return the gear to service after maintenance.

Enclosure Finish Maintenance

Instructions for maintaining the enclosure's protective finish.

Appendix A: Dielectric Testing

Dielectric Withstand Test Values

Provides appropriate withstand test values for system components.

Appendix B: Ratings and Capabilities

Ratings for Mini-Rupter Switches

Complete ratings for S&C Mini-Rupter Switches.

Ratings for Power Fuses with Uni-Rupter Interrupters

Complete ratings for S&C Power Fuses used with Uni-Rupter Interrupters.

Appendix C: Optional Features

List of Optional Features

Details optional features that can be added to pad-mounted gear.

Appendix D: Fuse Recommendations

Current-Limiting Fuses for PMH Gear

Lists current-limiting fuses and required S&C holders for PMH Pad-Mounted Gear.

Recommended Voltage Ratings for Fuses

Guidance on selecting appropriate voltage ratings for current-limiting fuses.

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