(a) When proceedings that involve a common question of law or fact are pending, the administrative law judge on the judge’s own motion or on motion of a party may order a joint hearing of any or all the matters at issue in the proceedings. The administrative law judge may order all the proceedings consolidated and may make orders concerning the procedure that may tend to avoid unnecessary costs or delay.
(b) The administrative law judge on the judge’s own motion or on motion of a party, in furtherance of convenience or to avoid prejudice or when separate hearings will be conducive to expedition and economy, may order a separate hearing of any issue, including an issue raised in the notice of defense or notice of participation, or of any number of issues.