I think the worst thing I've ever seen was a dairy farmer west of here.
After us building and wiring his new dairy shed, the guy decided he wanted a workshop on the side of the shed.
He built the shed, and ran a 3 phase power cable from the Main switch-board panel (in an old worn out high pressure water hose).
From there, he installed a new panel, no bushings on where the "hose" entered the panel.
This thing was carrying a cable rated at 400V @ 20A/phase, a rather small cable by our standards, but the lack of supports along the run of this hose, meant that it became a "tripping hazard".
One of his workers tripped on it and it pulled two of the phases out of the panel terminations, he thought no more of it and tucked the cable back against the wall, where it was.
Later on that day, the local Auxillary Fire Brigade along with us and a couple of other brigades were putting out this new dairy shed.
It was found that the feed end of the "sub-main" had been landed straight onto the load side of the main-isolator, as in, it wasn't fused at all.
Once you get the polystyrene component of dairy shed walls burning, they are VERY hard to extinguish.
And they say, 'lectrical work is so simple??!!
