1. (a) General rule. Service of all documents and other papers filed in all proceedings, including but not limited to motions, petitions, applications, notices, briefs, and exhibits shall be by personal delivery or by first class mail, except as hereinafter provided.
2. (b) On whom served. All documents and other papers shall be served by the person filing the same on every party in the proceeding and all such additional persons as the Commission shall direct.
3. (c) Service by the Commission. A copy of any document or other paper served at the direction of the Commission or presiding officer, showing the addresses to whom the document or other paper was mailed shall be placed in the Commission's files and shall be prima facia evidence of such service and the date thereof.
4. (d) Service as written notice. Written notice of all orders, decisions or authorizations, issued by the Commission shall be given to the party or parties affected thereby and to such other person as the Commission or presiding officer may deem appropriate by personal service upon such persons or by first class mail, as the Commission or presiding officer determines.

(Effective June 1, 1992)