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Joined: Mar 2003
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NFPA says Hazard Analysis anything operationing at over 50 volts . That Means Mcc's, Switchgear, Panels 120/208
277/480 & up and up. I take it that includes Panels and Equipment over 50 volts Period. Example PLC 120 volt feed??
fire alarm Panel. 120/240 volt feed.
X ray Machine ect ect. Where is the Break Line and where in 70E does it say the break line is?? NEC 110.16 Spells out where ist sticker goes . 70E from what I see Doesn't where second one is required except Fer Hazard analysis. 2008 NEC adds Electrical Equipment to 110.16.look up equipment in definations in NEC umm this gets interesting??

Arc Flash PPE Clothing, LOTO & Insulated Tools
Joined: Jul 2001
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JBD Offline
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NFPA70E does not require any sticker/lables in addition to those in NEC 110.16.

70E requires appropiate PPE for all energized work above 50V. There is no relief.

There are several options available for determing the appropiate PPE, a full blown "arc flash" study based on IEEE 1584 is only one method.

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All over 50 volts covers a lotta ground.

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J
JBD Offline
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Originally Posted by Yoopersup
All over 50 volts covers a lotta ground.


Yasure youbetcha.
Luckily, appropiate PPE is rarely a 40 cal "moon suit".

Joined: Mar 2003
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But Like lets say you open a Fire alarm Pnl/ 120/240 >
voltage test ist with PPE on??? Sticker on Box??

Joined: Feb 2003
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Originally Posted by Yoopersup
But Like lets say you open a Fire alarm Pnl/ 120/240 >
voltage test ist with PPE on??? Sticker on Box??


That is good question because if my memory serve me right most FA panels are pretty much current limited type.

Merci, Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

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JBD Offline
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There is no IEEE 1584 calculation for single phase circuits regardless of voltage so they are not normally part of arc flash studies therefore they rarely have a cal/cm² sticker on them.

If the calories or Hazard Risk Category (HRC) are not known you are only left with the 70E task tables. If the circuits are current limiting then you may be able to take advantage of the provisions that allow a reduction in the normal task table HRC.

How come the Wisconsin and UP guys are up at this time of night, don't you have to get up and shovel in the morning?

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JBD.,, This topic is almost parallel in other forum as well but not the excat same sisuation but i feel pretty simuair what you are talking about the Flash protection requirement need.


speaking of snow i only got dusting of snow [ about 30 CM or so { 1 1/2 inch } but right now it kinda windy now just got back from service call not too long ago the road start to get icy again ughh.

Merci, Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Joined: Mar 2005
Posts: 1,213
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Originally Posted by JBD
Originally Posted by Yoopersup
All over 50 volts covers a lotta ground.


Yasure youbetcha.
Luckily, appropiate PPE is rarely a 40 cal "moon suit".
PPE for 51V is a cotton shirt and dry hands, isn't it?

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How many amps Steve?


Greg Fretwell
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