30 CFR § 77.902-2 - Approved ground check systems not employing pilot check wires.

---
identifier: "/us/cfr/t30/s77.902-2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.902-2 - Approved ground check systems not employing pilot check wires."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.902-2"
section_name: "Approved ground check systems not employing pilot check wires."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "77"
part_name: "MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811."
regulatory_source: "36 FR 9364, May 22, 1971, unless otherwise noted."
cfr_part: "77"
---


# 77.902-2 Approved ground check systems not employing pilot check wires.

Ground check systems not employing pilot check wires shall be approved by the Secretary only after it has been determined that the system includes a fail safe design causing the circuit breaker to open when ground continuity is broken.