I_Automation
Lifetime Supporting Member
You bet buss plugs are dangerous, if you ware referring to outlets installed on buss duct.
In a previous job, we had an employee that plugged in a 480V/100A bus plug and it was wired wrong... 1 of the hot leads was wired incorrectly to ground.
The buss duct was at about waist level, and he got all sorts of shrapnel damage when the 100A Appleton plug blew apart when he turned on the 100A switch on the buss plug unit.
I worked at a stamping plant and found out the hard way one of the 480V 600A buss ducts had aluminum bars inside, not copper.
Every contact point gets a buildup under it like an anthill, but aluminum powder- not dirt. After years one of the hills that built on a lower aluminum bar got tall enough to arc to another bar. Sparks shot clear across the ceiling to the other wall and burnt a hole in the blocks directly behind that point. Had our electrician company get copper ducts and replace the full length in a few hours, but the major problem was a trunk telephone cable was hit and half the shop phones were out a week.