Petition for Modification of Trailing Cable Standards at West Elk Mine
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The Mine Safety and Health Administration (MSHA) published a notice on April 3, 2026, regarding a petition by Mountain Coal Company, LLC, to modify 30 CFR 75.503 standards at the West Elk Mine in Colorado. The petition seeks approval for longer trailing cables on specific equipment: up to 1,100 feet of No. 2 AWG G-GC cable for Komatsu Shuttle Cars Model 10SC32 at 995 volts AC, in addition to previously approved SHD-GC cables, and an extension to 1,100 feet of No. 2 AWG SHD-GC cable for mobile roof bolters, up from 1,000 feet. The company justifies these changes with short-circuit analyses using MSHA's software, showing that fault currents remain sufficient to trip protection at 800 amps, ensuring no less safety than standard rules. This builds on prior grants like Docket M-2023-027-C for shuttle cars and M-96-104-C for roof bolters. Proposed alternatives include calibrated circuit breakers sealed at 800 amps, daily inspections, proper cable hanging, and immediate repair of damages. MSHA invites comments by May 4, 2026, via regulations.gov or mail. If approved, these modifications would allow operational flexibility while maintaining miner protection through strict stipulations like labeled breakers and records of exams.
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Key Changes
- Allow 1,100 feet No. 2 AWG G-GC trailing cables for Komatsu 10SC32 Shuttle Cars at 995V AC, in addition to SHD-GC
- Extend mobile roof bolters to 1,100 feet No. 2 AWG SHD-GC cables from prior 1,000 feet limit
- Require circuit breakers with instantaneous trip at 800 amps, sealed and labeled
+ 3 more changes with Pro
Obligations
What this law requires
Submit all comments on the petition to MSHA's Office of Standards, Regulations, and Variances by May 4, 2026, using one of the specified methods: Federal eRulemaking Portal (regulations.gov), fax (202-693-9441), email (petitioncomments@dol.gov), or regular mail to MSHA Office at 200 Constitution Ave. NW, Washington, DC 20210.
If modification is approved, calibrate and seal circuit breakers at 800 amps on Komatsu Shuttle Cars Model 10SC32 and mobile roof bolters to ensure fault current protection remains effective.
If modification is approved, conduct daily inspections of trailing cables on equipment using extended cable lengths (up to 1,100 feet of No. 2 AWG G-GC or SHD-GC cables).
If modification is approved, ensure proper cable hanging and immediately repair any cable damages to maintain electrical protection integrity.
If modification is approved, maintain records of all cable examinations and inspections for audit and compliance verification purposes.