(1) Flexible cables shall not be used for portable or transportable motors, generators, transformers, rectifiers, electric drills, electric sprayers, welding sets or any other portable or transportable apparatus unless they are insulated for required voltage as per the relevant standards and adequately protected from mechanical damage.
(2) Where the protection is by means of metallic covering, the covering shall be in metallic connection with the frame of any such apparatus and earthed.
(3) The cables shall be three core type and four core type for portable and transportable apparatus working on [भाग III—खण्ड 4] भारतकाराजपत्र:असाधारण 109 single phase and three phase supply, respectively and the core meant to be used for earth connection shall be easily identifiable.