StacksVerified U.S. regulatory reference

30 CFR §77.701-3

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Where grounding wires are used to ground metallic sheaths, armors, conduits, frames, casings, and other metallic enclosures, such grounding wires will be approved if:
  1. (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.
  2. (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.