30 CFR § 77.703 - Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems.

---
identifier: "/us/cfr/t30/s77.703"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.703 - Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.703"
section_name: "Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems."
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"
---


# 77.703 Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems.

The frames of all stationary high-voltage equipment receiving power from ungrounded delta systems shall be grounded by methods approved by an authorized representative of the Secretary.