34 Pa. Code § 39.367
No employe shall approach or willingly permit others to approach any exposed underground part normally alive, except as provided in §§ 39.363-39.365 (relating to general requirements; voltages between 750 and 7,500; and voltages above 7,500), unless he has first assured himself of his own safety and the safety of those working under his direction by having the supply equipment and lines killed. Reference should also be made to §§ 39.381-39.391.
34 Pa. Code § 39.367
This section cited in 34 Pa. Code § 39.361 (relating to definitions); 34 Pa. Code § 39.411 (relating to general provisions); 34 Pa. Code § 39.421 (relating to general provisions); 34 Pa. Code § 39.431 (relating to general provisions); 34 Pa. Code § 39.441 (relating to general provisions); 34 Pa. Code § 39.451 (relating to general provisions); 34 Pa. Code § 39.461 (relating to general requirements); 34 Pa. Code § 39.471 (relating to general requirements); 34 Pa. Code § 39.491 (relating to general requirements); and 34 Pa. Code § 39.496 (relating to stringing wires).