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Arc flash on single phase or DC systems according to NFPA 70E?

Arc flash on single phase or DC systems according to NFPA 70E?

Arc flash on single phase or DC systems according to NFPA 70E?

(OP)
Hi everyone,

I know that IEEE 1584 equations are only for 3-phases AC systems.

But in NFPA 70E, I cant see anything else about system limits but 50V to ground or more.

Anybody knows if we can use NFPA 70E equations on single-phase or DC systems if a customer wants it?

RE: Arc flash on single phase or DC systems according to NFPA 70E?

There is no definitive guidance on this, as far as I know.  For single-phase ac, if you calculate as an equivalent three-phase system using IEEE 1584 equations, the results should be conservative.

For dc, I think you're on your own at this point.  I think EDSA claims to do arc-flash calcs for dc, but there's no official basis for the equations they use to calculate it.   

RE: Arc flash on single phase or DC systems according to NFPA 70E?

What software are you using?

Last I heard 70E group was working on developing DC equations but I dont think there are any yet, I was advised in the past to use AC equations until then.

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