Arc Flash and Clearances around electrical equipment
Arc Flash and Clearances around electrical equipment
(OP)
Recently I was running into increasing the size in the electrical room and trying to account for all NEC clearances around the equipment, when a thought hit me. The equipment I was dealing are low voltage, from 208V to 480V as the highest. The thought was what about arc flash. I was merely using the 3-foot clearances when perhaps the arc flash calculation might necessitate a larger clearance than the 3-ft, depending on the category of the equipment. I have not done a thorough calc yet, but has anyone come across this?






RE: Arc Flash and Clearances around electrical equipment
RE: Arc Flash and Clearances around electrical equipment
So the question you have to ask yourself is: Is there any reason to design an electrical room with clearances sufficient to accommodate occupants not doing work on the equipment under hazard conditions? Off the top of my head, I can't think of any, but your situation might be different. If not, additional space is just wasted.