(a) On written request filed with the Board and served on all other parties, or oral request with any extension granted confirmed in writing and served on all other parties by the requestor, and for good cause shown, the law judge or the Board may grant an extension of time to file any document; however, no extension of time will be granted for the filing of a document to which a statutory time limit applies.

(b) Extensions of time to file petitions for reconsideration shall not be granted upon a showing of good cause, but only in extraordinary circumstances.

(c) The General Counsel is authorized to grant unopposed extensions of time on timely oral request without a showing of good cause in cases on appeal to the Board from a law judge's initial decision or appealable order. Written confirmation of such a grant of extension of time must promptly be sent by the requesting party to the Board and served on all other parties to the proceeding.