An employer is not allowed to use 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 -
- 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; or
- 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.