Paragraph 5.54 Interveners
(1)
Except as otherwise provided by these rules, leave to intervene in proceedings is required and must be applied for by petition. The petition should be certified with the consent of the parties in the Case or, if consent is refused, the petition should be endorsed with a certificate of service on the parties. All petitions for leave to intervene, whether opposed by the parties or not, will be referred to a Board.
(2)
References in these rules to a party and to a respondent shall be deemed to include a person intervening.