52 Pa. Code § 1001.54 – Date of service.

(a) The date of service shall be the day when the document served meets one of the following conditions:
1. (1) The document is deposited in the United States mail.
2. (2) The document is deposited with an overnight express package delivery service.
3. (3) The document is delivered in person.
4. (4) The document is transmitted by telefacsimile or email as provided in § 1001.51(b) or § 1001.52(b) (relating to service by the Authority; and service by a party) prior to 4:30 p.m. local prevailing time in the Eastern Time Zone (United States).
(b) Unless otherwise prescribed by the Authority or presiding officer, whenever a party is required or permitted to do an act within a prescribed period after service of a document upon the party and the document is served by first-class mail by the United States Postal Service, 3 days shall be added to the prescribed period.
(c) Subsection (a) supersedes 1 Pa. Code § 33.34 (relating to date of service).

This section cited in 52 Pa. Code § 1005.211 (relating to exceptions to recommended decisions); and 52 Pa. Code § 1005.212 (relating to replies).