MSHA - Code of Federal Regulations - 30 CFR 77.704-4
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MSHA - Title 30 CFR
30 CFR § 77.704-4
Simultaneous repairs.

When two or more persons are working on an energized high-voltage surface line simultaneously, and any one of them is within reach of another, such persons shall not be allowed to work on different phases or on equipment with different potentials.