Concealed wiring (BYM) : Concealed conduit wiring with following PVC insulated and sheathed stranded cable (BYM) & PVC insulated Green / White coloured ECC wire (BYA) through PVC conduit of reputed manufacturer complete with 18 SWG GP sheet and pull box with 3mm thick ebonite sheet cover, fixing materials etc. as required including mending the damages good. All electrical contacts shall be of brass / copper connected through connector or soldering ( no twisting shall be allowed) and cables shall be manufactured and tested according to relevant IEC / BDS / BS / VDE standards and as per detailed specification mentioned in Annexure-1 of PWD Rate Schedule 2022The work shall be carried out as per direction & approval of the Engineer.Cable manufacturer(s) must have valid test certificate from internationally accrediated laboratory (like CPRI, KEMA etc) accepted / approved by the Engineer.(a):1C-2x2.5sqmm (BYM) cable with 2.5sqmm (BYA) ECC wire through PVC pipe of minimum inner dia 16 mm having wall thickness of 1.5 mm.