ISI marked, cord flexible sheathed circular 3 core with tinned or plain copper conductors PVC insulated, cores twisted together with a suitable right hand lay. The interstices may be filled with sheathing material, fillers or strengthening cards of Textile or any suitable material. The size of the card shall be 0.5 sq.mm. [16/0.20 mm] conforming to IS.694/2010 with latest amendments.