Where grounding wires are used to ground metallic sheaths, armors, conduits, frames, casings and other metallic enclosures, such grounding wires must comply with the following conditions:
(1) The cross-sectional area (size) of the grounding wire shall be at least one-half the cross-sectional area (size) of the power conductor where the power conductor used is No. 6 A.W.G. or larger.
(2) Where the power conductor used is less than No. 6 A.W.G., the cross-sectional area (size) of the grounding wire shall be equal to the cross-sectional area (size) of the power conductor.
Structure Code of Alabama
Title 25 - Industrial Relations and Labor.
Article 8 - Electrical Equipment.
Section 25-9-170 - Transformers, Conversion Equipment, Etc.
Section 25-9-171 - Power Wires and Circuits; Signal and Telephone Wires; Trolley and Feeder Wires.
Section 25-9-172 - Grounding of Frames, Casings, and Other Electrical Equipment.
Section 25-9-173 - Circuit Breakers, etc.; Insulating Platforms.
Section 25-9-174 - Telephones.
Section 25-9-175 - Electric Drills, etc.; Trailing Cables; Cables for Portable Equipment.