52 Pa. Code § 1.24
The provisions of this §1.24 amended under the Public Utility Code, 66 Pa.C.S. § § 309-311, 315, 331-335, 501, 504-506, 701-703, 1101-1103, 1301 and 1501.
This section cited in 52 Pa. Code § 1.55 (relating to service on attorneys).