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. Previously issued instructions for this same subject material are superseded by this HANDBOOK . Compliance related instructions that are contained in the MSHA Program Policy Manual remain in effect. Not all procedures and requirements are applicable for all mine types. Any deviation from the procedures outlined in this HANDBOOK should be based on the inspector s professional judgement and discussion with the inspector s supervisor, and consider conditions, practices, and circumstances specific to the mine.

c. Primary overcurrent protection of transformers d. Type of neutral connection (direct or derived) e. Grounding resistors f. Circuit breakers and auxiliary devices (grounded phase, undervoltage, etc.) g. Lightning and surge protection h. Disconnecting means for loads served by the power center i. Cable couplers and receptacles

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