(A) Appearances before the commission shall be by parties as defined in rule 1509-1-02 of the Administrative Code.
(B) Appearances before the commission shall be in person, or if the party is a partnership, then by a member of said partnership, or if a party is a corporation, then by an officer of said corporation, or if the party is a board, association or other entity, then by a member of said board, association or entity, or by the attorney for said individual, partnership, corporation, board, association or other entity.
(C) Any person deemed to be an interested person may appear before the commission, and may participate in an appeal to the extent, and in the manner, allowed by the commission. An interested person may petition for intervenor status pursuant to rule 1509-1-14 of the Administrative Code.
(D) All persons appearing before the commission shall conform to the standards of ethical conduct required in appearances in the courts of the state of Ohio. The commission shall have the authority, for good cause stated in the record, to bar from participation in a particular proceeding any person who shall refuse to comply with the commission's directions, or who shall be guilty of disorderly conduct, dilatory tactics, or contemptuous language in the course of such proceeding.