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 Post subject: NFPA 70E, Table 130.5(C) Likelihood ... first time after ..
PostPosted: Mon Sep 06, 2021 4:57 pm 
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Joined: Thu Oct 30, 2014 11:07 am
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Location: Ohio
In Table 103.5(C) Estimate of the Likelihood of Occurrence of an Arc Flash Indecent for ac and dc Systems it lists the "Operation of a CB or switch the first time after installation or completion of maintenance in the equipment." as having a likelihood of occurrence. Would this be inclusive of the first time a 20 ampere 277 volt 1-pole toggle switch (light switch) is operated?


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 Post subject: Re: NFPA 70E, Table 130.5(C) Likelihood ... first time after
PostPosted: Tue Sep 07, 2021 12:58 pm 
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Joined: Thu Apr 18, 2019 11:42 am
Posts: 59
I'd say yes...infant mortality. Likelihood though is low. You might reference IEEE 493.

Mike


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 Post subject: Re: NFPA 70E, Table 130.5(C) Likelihood ... first time after
PostPosted: Wed Sep 08, 2021 9:14 am 
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Joined: Mon Jan 18, 2010 11:35 am
Posts: 544
Location: Wisconsin
mpparent wrote:
I'd say yes...infant mortality. Likelihood though is low. You might reference IEEE 493.


It's not just infant mortality, in many cases until energization is the first time the circuit is 'checked' for wiring errors like short circuits.


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 Post subject: Re: NFPA 70E, Table 130.5(C) Likelihood ... first time after
PostPosted: Mon Sep 13, 2021 7:20 am 
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 566
That table name cannot be correct. Spell check strikes again.


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