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deprico
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Post subject: Shock Hazard Analysis  Posted: Mon May 12, 2008 12:30 pm |
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Joined: Tue Mar 25, 2008 1:00 pm
Posts: 32
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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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Noah
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Post subject: Posted: Mon May 12, 2008 1:52 pm |
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Joined: Mon Apr 14, 2008 7:10 am
Posts: 142
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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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Catcher13
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Post subject: Posted: Mon May 12, 2008 3:16 pm |
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Joined: Sun Aug 05, 2007 5:00 pm
Posts: 21
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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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deprico
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Post subject: Posted: Tue May 13, 2008 5:35 am |
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Joined: Tue Mar 25, 2008 1:00 pm
Posts: 32
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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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Catcher13
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Post subject: Posted: Tue May 13, 2008 7:45 am |
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Joined: Sun Aug 05, 2007 5:00 pm
Posts: 21
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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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wbd
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Post subject: Posted: Fri May 16, 2008 2:00 pm |
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Joined: Wed May 07, 2008 5:00 pm
Posts: 881
Location: Rutland, VT
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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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