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Jim Phillips (brainfiller)
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Post subject: If 130.7(A) Note 3 - 40 cal/cm2 is removed - Then What?  Posted: Sun Jan 17, 2016 9:27 am |
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1736
Location: Scottsdale, Arizona
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Last weeks' question regarding the possible elimination of Informational Note 3 of NFPA 70E 130.7(A) and the 40 cal/cm2 reference in the 2018 Edition of NFPA 70E had very mixed responses. So, on to the follow up question.
Keep in mind, the goal is to always place systems in an electrically safe working condition for voltages 50 volts and greater when possible.
If the 40 cal/cm2 reference is removed in 2018, how will that affect your (clients) electrical safety practices?
No change - still prohibit work above 40 cal/cm2
No change - we already permit some work above 40 cal/cm2
Not sure - We'll have to evaluate the impact of the change
We will probably begin permitting some work above 40 cal/cm2
Something else - please elaborate
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engrick
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Post subject: Re: If 130.7(A) Note 3 - 40 cal/cm2 is removed - Then What? Posted: Mon Jan 25, 2016 10:08 am |
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Joined: Fri Apr 15, 2011 7:43 am
Posts: 179
Location: Colorado
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As a consultant, I am not in the business (nor an expert) to determine if 39.9 is safe or if 40.0 is dangerous (absolute life safety). I only report the findings and the standard. Until there is more defined I can only recommend what has been published.
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Larry Stutts
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Post subject: Re: If 130.7(A) Note 3 - 40 cal/cm2 is removed - Then What? Posted: Mon Feb 15, 2016 8:47 am |
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| Sparks Level |
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Joined: Tue Apr 17, 2012 8:19 am
Posts: 253
Location: Charlotte, NC
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It really depends on the time. There is a big difference between 40 cal/cm^2 over 20 seconds and 40 cal/cm^2 over 20 milliseconds.
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arcad
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Post subject: Re: If 130.7(A) Note 3 - 40 cal/cm2 is removed - Then What? Posted: Tue Feb 16, 2016 12:15 pm |
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| Sparks Level |
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Joined: Wed Jun 10, 2009 5:00 pm
Posts: 271
Location: Toronto
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