IEEE-1584 and 125KVA 208V
IEEE-1584 and 125KVA 208V
(OP)
I have heard that IEEE-1584 suggests that 208 V systems 125 kVA and larger be evaluated for arc-flash hazard using their calculation method. I was just pouring through this document, looking for this reference. Is this implying that 208V systems under 125KVA do not need to be evaluated? Just for fun I did a calc based on a 2000KVA service entrance, 125KVA dry transformer to a 208V panel, and the arc flash came out signifigantly high. My questions are:
Where does IEEE-1584 say this?
and
Why does it say this?






RE: IEEE-1584 and 125KVA 208V
What other factors did you use for your calc? What program did you use? Clearing times? What did you get for a result?
RE: IEEE-1584 and 125KVA 208V
RE: IEEE-1584 and 125KVA 208V
Try to attend seminar on arc flash by Univ. of Madison, WI, USA.
Also see my response in thread242-135507 and search for other threads on the topic.
RE: IEEE-1584 and 125KVA 208V
So, yes for a 208/120V system served by a transformer smaller than 125 kVA, IEEE 1584 says no arc-flash calculations need to be done.
But, NFPA 70E does not exactly give you a free pass. I would still label the equipment as a potential arc-flash hazard.
RE: IEEE-1584 and 125KVA 208V