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 Post subject: boundries / distancesPosted: Thu Jul 22, 2010 5:46 pm

Joined: Sat May 01, 2010 2:20 am
Posts: 36
Can someone explain what is ment by 18" distance on the labels on panels ?
the lab, pab , rab, what do the distances mean? How do you work on them when you have to maintain a distance? I am lost on this stuff.

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 Post subject: Posted: Thu Jul 22, 2010 7:21 pm
 Plasma Level

Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
toolbbin wrote:
Can someone explain what is ment by 18" distance on the labels on panels ?
the lab, pab , rab, what do the distances mean? How do you work on them when you have to maintain a distance? I am lost on this stuff.

Knowing what those mean on how to apply it are basic concepts that should have been covered in your training to become a "qualified person:, not having this training means you shoul dnot be allowed to be doing the work.

But, chance are the 18" is your asumed working distance, meaning the calulated Ei on the label is calulated at that distance. 18" just happnes to be the average length of an outstreched arm to the torso of the worker.

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 Post subject: Posted: Fri Jul 23, 2010 4:20 am
 Plasma Level

Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1702
Location: Scottsdale, Arizona
You also might want to review the following Guide to Arc Flash Calculations Studies.

[url="http://www.brainfiller.com/documents/ArcFlashJimPhillipsPart1.pdf"]Arc Flash Part 1[/url]

[url="http://www.brainfiller.com/documents/ArcFlashJimPhillipsPart2.pdf"]Arc Flash Part 2[/url]

[url="http://www.brainfiller.com/documents/ArcFlashJimPhillipsPart3.pdf"]Arc Flash Part 3[/url]

_________________
Jim Phillips, P.E.
Brainfiller.com

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 Post subject: Posted: Fri Jul 23, 2010 2:23 pm

Joined: Sat May 01, 2010 2:20 am
Posts: 36
Thanks brainfiller. I plan on reading them over and over tonight. should be good studing

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