If any electrical equipment is to be hidden from view by the permanent placement of parts of a building, structure or grounds, the electrician installing the equipment shall so notify the Electrical Inspector by oral or written notice, and such equipment shall not be concealed until it has been inspected and approved by the Electrical Inspector. On installations where the concealment of equipment proceeds continuously, the electrician shall give the Electrical Inspector due notice orally or in writing so that periodic inspections may be made during the progress of the work.