a 480-120/240 50kva dry transformer, i am doing the bonding in the trans. do i ground the trans. frame with the 480 ground and remove the 120/240 strap to the frame. all raceways are pvc with on the 480 side i have 2 phases and a ground. also this trans is mounted on a portable plant with the 120/240 volt panel, the trans and panel are on the same steel frame. what is the proper grounding and bonding.