3In addition to executing the works the authorised persons may, in, on or over any land situated within the limits of lateral deviation shown on the plans and specifications referred to in the order or any land shown on the said plans which, being situated outwith those limits, is required for the purpose, construct, lay or erect and maintain any temporary works, that is to say, any coffer dams, flumes, diversion channels, culverts, engines, pumps, plant, machinery, roads, fences, stores, offices or other buildings, or any other works or things required for the purposes of or connected with the works:
Provided that any electrical works or apparatus constructed, laid or erected under this paragraph shall be so constructed, laid or erected, and so maintained and used, as to prevent interference with any telegraphic line as defined in the Telegraph Act, 1878, belonging to or used by the Postmaster General, or with telegraphic communication by means of any such line.