I forgot about this until just now. Sometime in 71 we were establishing power on a DC-10 and some jerk with a large wrench hanging out of his back pocket with the box end up jumped into the center accessory compartment. He landed on the bottom power relay across two phases which shorted out the relay, burnt the end off his wrench and destroyed a 3 phase 4 ought cable set from the #1 engine. We had to pull the bad one and replace it with one from another plane that was in wing joining and order a new one for that plane. He cost us two days of extra work and I think they fired the jerk.