(a) Only motions for extension of time under § 580.4(f) of this subchapter, motions to supplement the record under § 581.5 of this subchapter, motions to intervene under § 585.5, and motions for reconsideration under § 581.6 of this subchapter, are permitted.

(b) The Chair shall not, either individually or through counsel, file or respond to motions.