It is currently Thu Nov 23, 2017 4:59 pm



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Hazard Risk Category 2*
PostPosted: Mon Apr 20, 2009 5:39 pm 
Offline

Joined: Tue Feb 17, 2009 11:04 am
Posts: 36
Other than task and voltage level, are there further parameters which separates Hazard Risk 2 from 2*? For example incident energy levels, etc.?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Apr 21, 2009 1:11 pm 
Offline
Sparks Level

Joined: Fri Jan 16, 2009 1:07 pm
Posts: 67
Location: North Florida
Take a look at this existing thread. It may answer (or further confuse) your question: http://www.arcflashforum.com/showthread.php?t=384 .

TxEngr


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Fri Apr 24, 2009 10:57 am 
Offline

Joined: Fri Apr 03, 2009 11:07 am
Posts: 8
the main difference is the PPE requirement Category 2* requires an arc-rated hood, where as Category 2 you can just use an arc-rated face shield.


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Sun Feb 20, 2011 2:30 pm 
Offline

Joined: Tue Nov 09, 2010 5:00 pm
Posts: 19
Location: Virginia
It looks like 2* goes away with the 2012 Edition of 70E. A bit of confusion is finally resolved by that one.


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Feb 22, 2011 7:26 am 
Offline
Sparks Level

Joined: Tue Feb 24, 2009 7:05 am
Posts: 252
Don Jones wrote:
It looks like 2* goes away with the 2012 Edition of 70E. A bit of confusion is finally resolved by that one.


(See 70E-A2011-ROP.pdf)

The 2* naming goes away, but the new requirements for HRC 2 will be those of the old 2* (arc-rated hood or arc-rated balaclava and faceshield now necessary in HRC 2, with a minimum arc rating of 8 cal/cm^2).

Now that's confusion in progress, with all the labels in the field which will still call for HRC 2, or worse, labels with the PPE listed for HRC 2 at the time the label was affixed to the equipment.


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Feb 22, 2011 9:52 am 
Offline
Plasma Level
User avatar

Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1219
Location: Scottsdale, Arizona
Vincent B. wrote:
(See 70E-A2011-ROP.pdf)

The 2* naming goes away, but the new requirements for HRC 2 will be those of the old 2* (arc-rated hood or arc-rated balaclava and faceshield now necessary in HRC 2, with a minimum arc rating of 8 cal/cm^2).

Now that's confusion in progress, with all the labels in the field which will still call for HRC 2, or worse, labels with the PPE listed for HRC 2 at the time the label was affixed to the equipment.


Behind the scenes it actually makes sense - it's just one more change to get used to and yes, short term confusion in the process. NFPA 70E requires parts of the body within the AF Boundary to be protected and there was a conflict in that Category 2 does not necessarily accomplish this since there could still be exposure to the back of the head. Category 2* did.

The "New 2" attempts to resolve this conflict.

_________________
Jim Phillips, P.E.
Brainfiller.com


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
© 2017 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883