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 Post subject: “In determining the arc flash boundary zones in your electri
PostPosted: Mon Feb 23, 2015 8:21 am 

Joined: Wed Nov 12, 2014 12:01 pm
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“In determining the arc flash boundary zones in your electrical rooms, do you make any allowances (provisions) for permanent, existing barriers, walls, obstructions when using remote racking systems to rack in/out breakers”? In other words, do you allow personnel to reside behind a permanent barrier when remotely racking a breaker wearing a clothing category less than that specified for the IEEE-calculated energy at barrier’s distance from the equipment. This pertains to calculated arc flash boundary distances that extend beyond the block wall of any electrical room.”


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 Post subject: Re: “In determining the arc flash boundary zones in your ele
PostPosted: Tue Feb 24, 2015 5:04 am 
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Joined: Tue Oct 26, 2010 9:08 am
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Location: North Carolina
Ramonysabel wrote:
“In determining the arc flash boundary zones in your electrical rooms, do you make any allowances (provisions) for permanent, existing barriers, walls, obstructions when using remote racking systems to rack in/out breakers”? In other words, do you allow personnel to reside behind a permanent barrier when remotely racking a breaker wearing a clothing category less than that specified for the IEEE-calculated energy at barrier’s distance from the equipment. This pertains to calculated arc flash boundary distances that extend beyond the block wall of any electrical room.”


I generally consider anything substantial (masonry, steel, etc.) Based on thermal process experience a great heat shield to get from continuous ambients of 600-800 degrees down to under 120 degrees is nothing more than 1-2 pieces of sheet metal siding separated by a 1“ spacer for the 2 layer version. Not saying this is effective for arc flash but gives you an idea how little material is required for purely thermal concerns.


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