30 CFR § 77.506-1 - Electric equipment and circuits; overload and short circuit protection; minimum requirements.

---
identifier: "/us/cfr/t30/s77.506-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.506-1 - Electric equipment and circuits; overload and short circuit protection; minimum requirements."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.506-1"
section_name: "Electric equipment and circuits; overload and short circuit protection; minimum requirements."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 77.506-1 Electric equipment and circuits; overload and short circuit protection; minimum requirements.

Devices providing either short circuit protection or protection against overload shall conform to the minimum requirements for protection of electric circuits and equipment of the National Electric Code, 1968.