Sec.  1.253   Time and place of hearing.

   (a) The Commission will specify the day on which and the place at which any
   hearing is to commence.

   (b) The presiding officer will specify the days on which subsequent hearing
   sessions are to be held.

   (c)  If  the Commission specifies that a hearing is to commence in the
   District of Columbia, it shall be moved therefrom only by order of the
   Commission.

   (d) If the Commission specifies that a hearing is to commence at a field
   location, all appropriate proceedings will be completed at such location
   before the hearing is moved therefrom. When such proceedings are completed,
   the presiding officer may move the hearing from the field location specified
   to another appropriate field location or to the District of Columbia.