Employes shall not fire shots, handle tools, or perform other work in such a manner as to injure cables or wires in the vicinity. If doubt exists as to performance of such work, employes should consult a superior.
34 Pa. Code § 39.478
This section cited in 34 Pa. Code § 39.461 (relating to general requirements); and 34 Pa. Code § 39.471 (relating to general requirements).