50.—(1) Subject to subsection (2), references in section 54 of the Principal Act to an authorised undertaker shall include references to the holder of an authorisation or the holder of a direct line permission under section 37.

(2) Where regulations made before the commencement of this section are made by the Board under the Principal Act which regulate the placing of electric lines across or along or either over or under any railway, land, inland navigation, dock or harbour those regulations shall apply to the holder of an authorisation or the holder of a direct line permission under section 37.

(3) The Board shall not amend regulations to which subsection (2) applies without the consent of the Commission.

(4) The Commission may prescribe modifications to regulations referred to in subsection (2) for the purposes of enabling their application to the holder of an authorisation or the holder of a direct line permission under section 37.