Hey guys,
Had one about a year ago...
Comm bldg, HVAC unit at rooftop being relocated. Electrician locates panel...turns off two pole CB marked HVAC unit #x...goes back up to roof, opens disco.. finds disco is 3 pole....and 1 leg is "hot" to ground. Goes back down to panel..finds "single phase panel" with 3 phase feeder. The clown who put it in used the neutral block for the third phase leg!!
Now imagine some "unqualified" person, or some sparky in a hurry....disaster in the making.
Attempted to track down the culprit on general principles, but the trail dead ended cause there was no permit, no inspections, and the tenant paid "cash"!!
BTW, we were there working for the landlord, and yes, we did correct it.
John
