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 Post subject: 3 phase overhead distribution line; single phase arc flash?
PostPosted: Thu Jan 13, 2022 8:20 am 

Joined: Thu Jan 13, 2022 8:12 am
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OSHA 1910 Appendix E Table 3 permits single phase arc flash calculations if it can be demonstrated that multiple phases are separated sufficiently. In the case of 15kV+ arc flash studies, ARCPRO is permitted for single phase arc flash studies without having to use a multiplier/conversion factor.

When you put these two together, how does one justify that a 3phase overhead 15kV+ line would likely only result in a single phase arc flash? Is the innate conductor spacing sufficient for this?


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 Post subject: Re: 3 phase overhead distribution line; single phase arc fla
PostPosted: Mon Jan 17, 2022 9:12 am 
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Joined: Mon Sep 17, 2007 5:00 pm
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Location: Scottsdale, Arizona
For distribution and transmission lines, the spacing between phases is considered too great for an arc to initiate. Good question!


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 Post subject: Re: 3 phase overhead distribution line; single phase arc fla
PostPosted: Tue Jan 18, 2022 8:36 am 
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 579
I understood the new rules were intended to encourage covering the unworked phases.


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