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 Post subject: Shock Hazard Analysis
PostPosted: Mon May 12, 2008 12:30 pm 
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Posts: 32
In doing an arc flash analysis, is it necessary to complete a shock hazard analysis and define the different approach boundaries (other than the flash protection boundary)


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PostPosted: Mon May 12, 2008 1:52 pm 
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Yes, I provide both for my projects. PTW32 from SKM generator boundaries for Arc flash and shock hazard when you select the template 14 or 18 in custom labels


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PostPosted: Mon May 12, 2008 3:16 pm 
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It's not so much that the shock hazard is part of the arc flash study but NFPA 70E requires both a Shock and Flash hazard assesment before live work is done so most people (everyone??) ties them both together and put both on the labels for completeness.


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PostPosted: Tue May 13, 2008 5:35 am 
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Is the shock hazard information generally taken from the NFPA 70E tables, or calculated with software? I have been using easypower and I see nothing about the shock boundaries in the software.


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PostPosted: Tue May 13, 2008 7:45 am 
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I believe all the programs have a data base that contains the approach boundary info from NFPA 70E. The labels should reflect what is found in 70E for Limited, Restricted and Prohibited approach limits.


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PostPosted: Fri May 16, 2008 2:00 pm 
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Joined: Wed May 07, 2008 5:00 pm
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Location: Rutland, VT
In EasyPower, when the label are printed both the Flash Hazard and Shock Hazard information is on the label.

For example:

1'-9" Flash hazard boundary
1.9 cal/cm2 flash hazard at 18 inches
#0 PPE level

0.48 kV shock hazard when cover is removed
3'-6" limited approach
1'-0" Restricted approach - Class 00 voltage gloves
0'-1" Prohibited approach - Class 00 voltage gloves

_________________
Barry Donovan, P.E.
www.workplacesafetysolutions.com


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