(1) A person carrying out or preparing to carry out work on or near electrical equipment must treat each exposed electrical conductor as live until the equipment is—(a) isolated and proved to be de-energised; and(b) if the equipment is a high voltage conductor—earthed.
(2) In this section—
"electrical equipment" means an item used for generating, converting, transmitting, distributing or using electrical energy.
"high voltage" means a voltage of more than 1200V.