Transcription of MSHA HANDBOOK SERIES
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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. Previously issued instructions for this same subject material are superseded by this HANDBOOK .
1) Overcurrent relays 2) Current transformer ratios 3) Ground check circuits 4) Ground fault relays 5) Undervoltage relays 2. Power Centers a. Frame grounding b. Incoming disconnecting devices c. Primary overcurrent protection of transformers d. Type of neutral connection (direct or derived) e. Grounding resistors f.
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