maintenance of electrical unit r.maintenance of 500 kva sub-station,200 tr ac plant and other electromechanical installation and fire extinguisher at nsrtc, varanasi sh- providing services for operation of pump sets, moei and fans, street light-compound light in residential and office buildings including operation of 2-200 tr ac plant, sub-station equipment, 380-125 kva dg set and day to day routine maintenance of roof top solar power generation systems..