S&C PMH-4 - 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-4 Specifications

General

Maximum Voltage	17 kV
Rated Voltage	15 kV
Continuous Current	600 A
Rated Continuous Current	600 A
Interrupting Rating	12.5 kA
Rated Interrupting Current	12.5 kA
BIL	95 kV
BIL Rating	95 kV
Frequency	50/60 Hz
Type	Pad-Mounted Gear

Summary

Introduction to PMH Pad-Mounted Gear

Qualified Persons for Operation

Details requirements for personnel working with the equipment.

Proper Application and Ratings

Safety Information and Alerts

Understanding Safety-Alert Messages

Explains the meaning of DANGER, WARNING, CAUTION, and NOTICE signals.

Location of Safety Labels

Safety Label Reorder Information

Detailed Safety Precautions

Qualified Persons Access

Restricts access to pad-mounted gear to qualified personnel only.

Safe Operating Procedures

Emphasizes following all safe operating procedures and rules.

Personal Protective Equipment (PPE)

Lists required PPE for safe operation and maintenance.

Safety Labels Integrity

Energized Terminals Assumption

States to always assume terminals are energized until proven otherwise.

Backfeed Hazards

Warns about potential energization of switches via backfeed.

De-energizing, Testing, and Grounding Procedures

Lists critical steps for safely de-energizing and grounding equipment.

Voltage Testing Procedures

Details proper high-voltage testing before touching equipment.

Grounding Requirements

Explains proper grounding procedures for the enclosure.

Maintaining Proper Clearance

Stresses maintaining safe clearance from energized components.

Overview of PMH Pad-Mounted Gear

Key Interrupter Components

Safety Barriers and Isolation

Details dual-purpose front barriers for isolation and safety.

Enclosure Doors Operation

Opening and Closing the Doors

Switching with Uni-Rupter Switches

Installing and Closing the Fuse

Step-by-step guide for installing and closing fuses using specific tools.

Opening and Removing the Fuse

Re-Fusing Operations

How to Detect and Replace a Blown Fuse

Appendix B: Ratings and Capabilities

Ratings for S&C Mini-Rupter Switches

Ratings for Fuses with Uni-Rupter Interrupters