.-(1) No person shall instal or use in a hazardous area any portable electric lamp or apparatus other than a portable lamp or apparatus of a type approved by the Chief Controller after such examination and test and for such application as he may specify.(2)No mains operated portable lamp shall be operated at a voltage exceeding 25 volts above the earth:Provided that the Chief Controller may, at his discretion, allow higher operating voltage not exceeding 55 volts above earth.(3)All portable lamps or apparatus other than a self-contained lamp or apparatus shall be connected to the mains in such a manner and used under such conditions as the Chief Controller may specify.
