No employer or user shall use or permit the use of a portable electric light in wet or damp conditions or in confined spaces inside metal vessels or when the person is in contact with large masses of metal, unless, subject to the provisions of subregulation (1) -
(a) the lamp is connected to a source of electrical energy incorporating an earth leakage protection device the construction of which meets the requirements of the relevant safety standard incorporated into these Regulations under section 44 of the Act; or
(b) the operating voltage of the lamp does not exceed 50 V, and where this electrical energy is derived from a transformer, such transformer shall have separate windings.