---
kind: "section"
citation: "30 C.F.R. § 77.802"
title: "30"
number: "77.802"
heading: "Protection of high-voltage circuits; neutral grounding resistors; disconnecting devices."
url: "https://uscodex.org/cfr/30/77.802"
---

# §77.802. Protection of high-voltage circuits; neutral grounding resistors; disconnecting devices.


High-voltage circuits supplying portable or mobile equipment shall contain either a direct or derived neutral which shall be grounded through a suitable resistor at the source transformers, and a grounding circuit, originating at the grounded side of the grounding resistor, shall extend along with the power conductors and serve as a grounding conductor for the frames of all high-voltage equipment supplied power from that circuit, except that the Secretary or his authorized representative may permit other high-voltage circuits to feed stationary electrical equipment, if he finds that such exception will not pose a hazard to the miners. Disconnecting devices shall be installed and so equipped or designed in such a manner that it can be determined by visual observation that the power is disconnected.


## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 36 FR 9364, May 22, 1971, unless otherwise noted.