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MSHA HANDBOOK SERIES

MSHA HANDBOOK SERIES Department of Labor Mine Safety and Health Administration Mine Safety and Health Enforcement December 2020 HANDBOOK Number: PH20-V-5 Electrical Inspection Procedures HANDBOOK PREFACE This HANDBOOK sets forth procedures for MSHA personnel to follow when conducting investigations and inspections of mines and facilities. Volume I provides guidance for electrical specialist, while Volume II provides guidance to MSHA general inspectors who encounter mine electrical systems and electric-powered equipment during the course of their inspections.

1. Substations, Transformers, and Switchgear a. Fences and enclosures b. Vertical and horizontal clearance from live parts c. Disconnecting devices d. Primary overcurrent protection for transformers e. Transformer connections f. System grounding (solid grounded, resistance grounded, ungrounded, etc.) g. Grounding resistors and connections

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ARTICLE 430 - MOTORS, MOTOR CIRCUITS AND …

arlweb.msha.gov

(4) The locked-rotor current if a polyphase motor or if a single phase motor having a full-load current more than 4.5 amperes at 230 volts or 9 amperes at 115 volts. (5) The words "Thermally Protected" if a thermal protector integral with the motor-compressor is provided. Exception: The full-load current may be marked on the

  Polyphase

MSHA - Second Update on Failure of High Pressure Gas ...

arlweb.msha.gov

Equipment Alert – November 4, 2011 2nd Update on Failure of High Pressure Gas Fittings and Valves in Refuge Alternatives An Equipment Alert and an update have been issued regarding valve and fitting failures on breathable air components of refuge alternatives.

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Chapter 14

arlweb.msha.gov

Chapter 14 EMERGENCY ACTION PLANNING MAY 2009 14–1 14.1 PURPOSE Emergency action planning for dams includes establishing procedures and …

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Federal Mine Safety & Health Act of 1977, Public Law 91 ...

arlweb.msha.gov

Federal Mine Safety & Health Act of 1977, Public Law 91-173, as amended by Public Law 95-164 An Act Be it enacted by the Senate and House of Representatives of …

  Health, Safety, Mines, Mine safety

SAND, GRAVEL, AND CRUSHED STONE ON-THE-JOB …

arlweb.msha.gov

materials, such as phosphate, gypsum, weathered shales, etc. Impact crushers cannot handle as large a top sized material as jaw, or gyratory, crushers can; however, impact crushers …

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MSHA HANDBOOK SERIES

arlweb.msha.gov

MSHA HANDBOOK SERIES U. S. Department of Labor ... Industrial Power Systems Handbook by Beeman (McGraw-Hill) National Electrical Code, 1968, 1971, 1975, ... Electric Power Distribution for Industrial Plants - IEEE Standard 141-1976 2. EEE Green Book. Recommended Practice for

  Series, Handbook, Electric, Power, Electric power, Sham, Msha handbook series

30 CFR Part 46 Starter Kit with Sample Training Plan

arlweb.msha.gov

30 CFR Part 46 Starter Kit with Sample Training Plan U.S. Department of Labor Mine Safety and Health Administration National Mine Health and Safety Academy . Instruction Series Guide IG 36 . December 1999 Reprinted 2001 . Visit our website at . ... 43 Training Materials ...

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INSPECTING AND REPLACING WIRE ROPES

arlweb.msha.gov

A cement plant worker was killed when the boom hoist rope of a mobile crane broke, dropping the crane boom on him. Much ofthe hazard of wire rope breakage can be eliminated by following a few simple safety rules: 1. Always assume a wire rope could break at anytime. 2. Do not work or pass under the buckets or booms of shovels, draglines, or cranes

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WORKPLACE EXAMINATIONS

arlweb.msha.gov

Mar 25, 2014 · other mines is a serious impediment to the future growth of the coal or other mining industry and cannot be tolerated . 30 CFR 56.18002 •Thorough and complete Workplace Examinations are a requirement and an invaluable tool to assure a safe and healthy workplace. Mine operator’s should diligently

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ARTICLE 220 - BRANCH CIRCUIT AND FEEDER CALCULATIONS …

arlweb.msha.gov

Telephone Exchanges. Shall be waived for manual switchboards and switching frames in telephone exchanges. The provisions of Section 220-2(b) shall apply to all other ... fixed and portable appliances, each installation should be considered as to the load likely to be imposed and the capacity

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