Telephone service or approved equivalent means of communication shall be provided at the bottom of each main shaft or slope and in all mines from the surface to the working sections of the mine where the mine workers are more than 1,500 feet from the surface.
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.