Linemen and assistants and groundmen, in construction, extension, removal, or repair work, shall study and strictly observe the provisions of §§ 39.421-39.429 as well as the general rules in sections §§ 39.331-39.405 which apply to their work.
34 Pa. Code § 39.421
This section cited in 34 Pa. Code § 39.441 (relating to general provisions); and 34 Pa. Code § 39.461 (relating to general requirements).