Underground Mine Electrical Systems Inspection Checklist

This comprehensive underground mine electrical systems inspection checklist ensures regulatory compliance with MSHA, NFPA 70E, 30 CFR Part 75, 30 CFR Part 57. Comprehensive electrical safety inspection for underground mines covering trailing cables, permissible equipment, grounding, and circuit protection per MSHA 30 CFR Part 75 Subpart F (coal) and 30 CFR Part 57 Subpart K (metal/nonmetal). Prevents electrical ignitions and electrocution in hazardous mine environments. Complete all sections to

  • Industry: Mining & Quarrying
  • Frequency: Per Shift / Daily
  • Estimated Time: 40 minutes
  • Role: Mine Safety Officer / Site Manager
  • Total Items: 22
  • Compliance: MSHA, NFPA 70E, 30 CFR Part 75, 30 CFR Part 57

Permissible Electrical Equipment

Verify permissible equipment certification per 30 CFR 75.500.

  • Does all electrical equipment used in return airways carry current MSHA permissibility approval plate?
  • Are all permissible equipment enclosures intact with no missing bolts, broken flanges, or damaged seals?
  • Are all cable entries to permissible enclosures properly sealed and secured?
  • Has permissible equipment been free of unauthorized modifications that could void permissibility?
  • Are enclosure joint bolts lubricated and torqued per manufacturer specification to maintain flame path?

Trailing Cables and Flexible Cords

Inspect trailing cables per 30 CFR 75.601-75.603.

  • Are trailing cables free of cuts, splices, or damage exposing conductors per 30 CFR 75.603?
  • Are cables properly supported to prevent mechanical damage and not lying in water?
  • Are cable ampacities rated for load being served per applicable tables in 30 CFR 75.601?
  • Are all cable couplers and connectors the correct type for the voltage class?
  • Have trailing cables been megohm-tested per 30 CFR 75.604 within required intervals?
  • Are cable reels kept wound to prevent cable piling and ground faults?

Grounding and Ground Continuity

Verify grounding per 30 CFR 75.509.

  • Is ground continuity tested before energizing trailing cables per 30 CFR 75.901?
  • Are equipment ground wires (bare or green) intact, properly sized, and connected at both ends?
  • Are ground continuity monitors installed and operational on all applicable equipment per 30 CFR 75.902?
  • Are substation and transformer neutral grounds tested per annual requirement?
  • Are equipment metal cases bonded to ground via equipment ground conductor?

Circuit Protection and Power Centers

Verify circuit protection per 30 CFR 75.700-75.705.

  • Are circuit breakers and fuses the correct rating for conductor ampacity (not oversized)?
  • Is power center interior free of accumulation of coal dust, moisture, or unauthorized materials?
  • Can all circuit disconnects be locked in open position for maintenance per 30 CFR 75.511?
  • Is high-voltage equipment guarded with appropriate interlocks preventing energized access?
  • Are all electrical work and examinations performed by certified mine electricians per 30 CFR 75.153?
  • Are electrical examination records maintained per 30 CFR 75.512 within past 7 days?

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Why Use This Underground Mine Electrical Systems Inspection Checklist?

This underground mine electrical systems inspection checklist helps mining & quarrying teams maintain compliance and operational excellence. Designed for mine safety officer / site manager professionals, this checklist covers 22 critical inspection points across 4 sections. Recommended frequency: per shift / daily.

Ensures compliance with MSHA, NFPA 70E, 30 CFR Part 75, 30 CFR Part 57. Regulatory-aligned for audit readiness and inspection documentation.

Frequently Asked Questions

What does the Underground Mine Electrical Systems Inspection Checklist cover?

This checklist covers 22 inspection items across 4 sections: Permissible Electrical Equipment, Trailing Cables and Flexible Cords, Grounding and Ground Continuity, Circuit Protection and Power Centers. It is designed for mining & quarrying operations and compliance.

How often should this checklist be completed?

This checklist should be completed per shift / daily. Each completion takes approximately 40 minutes.

Who should use this Underground Mine Electrical Systems Inspection Checklist?

This checklist is designed for Mine Safety Officer / Site Manager professionals in the mining & quarrying industry. It can be used for self-assessments, team audits, and regulatory compliance documentation.

Can I download this checklist as a PDF?

Yes, this checklist is available as a free PDF download. You can also use it digitally in the POPProbe mobile app for real-time data capture, photo documentation, and automatic reporting.

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