I was on a job several years ago where the poco 3 phase 120/208 service was stepped up to 480v. the foreman had the engineer explain what he was supposed to do with the neutral and the xo connection. He was told to leave it alone and not to land the neutral. The next day the ground was smoking from a red hot bonding electrode he installed from the xfmr to the building service. the xfmr winding laminations were dripping off the coils. during the resulting finger pointing. the poco stated that the neutral not being landed on the xo and bonded to earth ground had been the cause. Any comments would be greatly appreciated.
