bids are invited for custom bid for services - maintenance and painting of cable trays/structures of smelter plant - through cleaning and painting of cable tray width above 300mm upto 500mm with two coats of anticorrosive primer, two coats of synthetic enamel paint (enamel paints, zinc chromate red oxide and thinner will be issued as free issue material). , through cleaning and painting of cable tray width above 500mm upto 1000mm with two coats of anticorrosive primer, two coats of synthetic enamel paint (enamel paints, zinc chromate red oxide and thinner will be issued as free issue material). , through cleaning and painting of surface of steel structure, channel, angle, cable tray supporting members etc. of different size with two coats of anticorrosive primer, two coats of synthetic enamel paint (enamel paints, zinc chromate red oxide and thinner will be issued as free issue material). , supply, fabrication and erection of steel supports/frames structures etc. with two coats of anti corrosive primer, two coats of synthetic paint for mounting switches, starters, pannels, luminaries, overhead cross arms as per direction of engineer-in-charge. , fabrication and erection of steel supports/frame structures etc. with two coats of anti-corrosive primer, two coats of synthetic paint for mounting switches, starters, panels, luminaries, overhead cross arms as per direction of engineer-in-charge (without supply of steel).