30 CFR § 75.900-4 - Testing, examination, and maintenance of circuit breakers; record.
---
identifier: "/us/cfr/t30/s75.900-4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 75.900-4 - Testing, examination, and maintenance of circuit breakers; record."
title_number: 30
title_name: "Mineral Resources"
section_number: "75.900-4"
section_name: "Testing, examination, and maintenance of circuit breakers; record."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "75"
part_name: "MANDATORY SAFETY STANDARDS—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, 813(h), 957."
regulatory_source: "35 FR 17890, Nov. 20, 1970, unless otherwise noted."
cfr_part: "75"
---
# 75.900-4 Testing, examination, and maintenance of circuit breakers; record.
The operator of any coal mine shall maintain a written record of each test, examination, repair, or adjustment of all circuit breakers protecting low- and medium-voltage circuits serving three-phase alternating current equipment used in the mine. Such record shall be kept in a book approved by the Secretary.
[35 FR 17890, Nov. 20, 1970, as amended at 60 FR 33723, June 29, 1995]