34 Pa. Code § 95.41
Service of papers on a party shall be made personally, by United States mail, or by leaving a copy of the papers with the person then in charge at the principal office or place of business of the person to be served. Where an attorney or representative has entered his appearance under § 91.2(a) (relating to appearances), complaints, orders and other processes and papers of the Board shall be served on the attorney or representative and need not be served on the party. Service by a party on an attorney or representative who has entered an appearance under § 91.2(a) may be made personally, by United States Postal Service first-class mail, or where the attorney or representative has approved service by e-mail in an entry of appearance, by e-mail to the e-mail address provided in the entry of appearance.
34 Pa. Code § 95.41
The provisions of this §95.41 amended under section 4(f) of the Pennsylvania Labor Relations Act (43 P.S. § 211.4(f)); and section 502 of the Public Employe Relations Act (43 P.S. § 1101.502).