Specifications include, but are not limited to: A vendor(s) to furnish three phase pad mount transformers for the Dept. of Power and Light. This will be a one time shipment. 4.1 Maximum temperature rise at continuous full load to be 65 degree C. above and a 30-degree C. average ambient with a maximum ambient not to exceed 40 degree C. 4.2 KVA & Voltage Ratings: 45 KVA through 2500 KVA; 12,470 Grd Y/7200-208 Grd Y/120*, 45 KVA through 3750 KVA; 12.470 Grd Y/7200-480 Grd Y/277* *Secondary voltage will be specified for each unit ordered. 4.3 The insulation class shall be 15 KV. The basic insulation level shall be 95 KV (BIL). 4.4 *Unit shall be filled with virgin “PCB-Free <1-ppm” mineral oil dielectric fluid with a maximum allowable concentration of less than 1-ppm PCB. A letter from the manufacturer is required to certify that only “PCB-Free <1-ppm” oil is used in the manufacturing process. “Less than 1 PPM PCB” shall be etched or otherwise permanently written on the nameplate. 4.5 Two (2) 2 ½ percent taps above and below nominal voltage on the high voltage windings. Tap changer to be operated externally and de-energized.