48.—The power to lay electric lines conferred on the Board by section 51 and section 52(1) of the Principal Act may, with the consent of the Commission, also be exercised by the holder of an authorisation or the holder of a direct line permission under section 37 and the said section 51 and 52(1) shall apply to the holder of an authorisation or the holder of a direct line permission under the said section 37 in like manner as they apply to the Board.