You are likely talking about the 277/480 4-wire wye building commercial power. That power never touches the aircraft. But I'm certain you know that.
Originally Posted by
APMechXJ
next time you are in dtw come to the 9e mx office and will show you the entry and exit wounds I have from 480volts going in one hand through my body and out the other.. and oh yeah.. that's right... 30 years of aircraft maintenance on my resume.. anyway.. keep your button selected and wear your hat