---
kind: "section"
citation: "30 C.F.R. § 77.701-3"
title: "30"
number: "77.701-3"
heading: "Grounding wires; capacity."
url: "https://uscodex.org/cfr/30/77.701-3"
---

# §77.701-3. Grounding wires; capacity.


Where grounding wires are used to ground metallic sheaths, armors, conduits, frames, casings, and other metallic enclosures, such grounding wires will be approved if:

- (a) Where the power conductor used is No. 6 A.W.G., or larger, the cross-sectional area of the grounding wire is at least one-half the cross-sectional area of the power conductor.
- (b) Where the power conductor used is less than No. 6 A.W.G., the cross-sectional area of the grounding wire is equal to the cross-sectional area of the power conductor.

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

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