28. Electrical installation
(a) All lights in vault, storage shed or examination room shall be at the ceiling and of the fixed type. They shall be fitted with substantial, outer protecting vapourproof globes and equipped with keyless sockets. All switches, fuses, plugs, sockets, electric meters and distribution boards shall be installed outside the vault, storage shed or examination room. All frames shall be effectively earthed.
(b) All electric wiring and equipment shall conform to the Regulations for the Electrical Equipment of Buildings framed by the Institution of Electrical Engineers. All electric wiring shall be in gas-light screwed conduits which shall be electrically and mechanically continuous throughout, and effectively earthed outside the building.
(c) Portable electric lights on extension cords shall not be used in any vault, storage shed or examination room.