Section 54, The Machinery (Safe Working Citation

(1) No examination, repairs, or alterations necessitating fr~a~t~nsthe dangerous approach to or the handling of electrical apparatus .:he: aen shall be carried on while such apparatus is live unless such work e1 xamt~nin 1 g b d h 1 . . f eec nca be done y or un er t e constant persona supervisiOn o a apparatus. skilled electrician or person in control of such apparatus. (2) Whenever any work is to be carried out on any electrical apparatus which has been disconnected from all sources of supply adequate precautions shall be taken, by earthing or other means- (a) to discharge electrically such apparatus and any other apparatus adjacent thereto if there be danger<from such other apparatus, and (b) to prevent any such apparatus or conductor from becoming accidentally or inadvertently charged whilst persons are working thereon.