Specifications include, but are not limited to: Transformers Needed: 1. One 500 kva 3-phase, liquid-filled, dead-front, radial-type padmount transformer, dual voltage of 7200/12470-2400/4160 with a low-side voltage of 277/480 and 200A hi-side inserts. 2. Three 500 kva 3-phase, liquid-filled, dead-front, radial-type padmount transformers, dual voltage of 7200/12470-2400/4160 with a low-side voltage of 120/208 and 200A hi-side inserts. One of these three 500 kva units is to have both a 4-position âTâ switch and is to be a loop-type instead of radial. 3. One 500 kva 3-phase, dead-front, loop-type padmount transformer, dual voltage 7200/12470-2400/4160 with 600A hi-side inserts and a low-side voltage of 120/208.