It is currently Wed Feb 21, 2018 6:17 pm



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Face sheild required for Cat 1 (4-8 cal/cm^2)?
PostPosted: Tue Feb 01, 2011 6:00 am 
Offline

Joined: Fri Jul 10, 2009 8:57 am
Posts: 22
Location: Toronto
CSA Z462 requires the face shield in category 1. what's the general thought on this? Is anyone (still) not using the faceshield for exposures of 1.2-4 cal/cm^2 (NOT, as the subject line says, 4-8 cal/cm^2!!!)?

I understand that 1.2 cal/cm^2 is what is generally considered to be the "exposed skin" limit (50% chance of getting a second-degree burn), but what was the original rationale for NFPA 70E omitting the face shield from category 1, and is anyone still following that rationale? Are there any studies or documented experience that point to why it was added (or perhaps why it's not really necessary)?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Feb 01, 2011 7:09 am 
Offline
Sparks Level

Joined: Tue Feb 24, 2009 7:05 am
Posts: 252
Category 1 PPE offers a protection of at least 4 cal/cm^2. Since you need to have a protection at least as high as the hazard if you use the incident energy method of selecting PPE, you can't use Category 1 PPE for an exposure above 4 cal/cm^2.

NFPA 70E 2009 and CSA Z462 2008 both require a face shield rated at least 4 cal/cm^2 in HRC1. I don't have access to NFPA 70E 2004 right now to verify if the requirement was the same at that time.


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Feb 01, 2011 8:12 am 
Offline

Joined: Thu Jul 09, 2009 11:04 am
Posts: 14
I don't think she was asking about exposure above 4 cal/cm^2.

I believe she made a typo in the thread title and wasn't able to change it. Her question is about incident energy in the 1.2 to 4 cal/cm^2.

Am I right Jody?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Tue Feb 01, 2011 3:15 pm 
Offline

Joined: Fri Jul 10, 2009 8:57 am
Posts: 22
Location: Toronto
Not quite a typo, a brain hiccup. I am talking about incident energy of 1.2-4 cal/cm^2. The old NFPA 70E didn't require a faceshield. The new one does. There is dissent in our arc flash committee.

- Is there anyone still not using a faceshield in this range? how do you justify it?
- is there a particular reason that NFPA 70E changed their recommendation?

thanks,

jody


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed Feb 02, 2011 1:50 pm 
Offline
Arc Level

Joined: Tue Jan 13, 2009 5:00 pm
Posts: 442
See the Reports on proposals and comments.
[url="http://www.nfpa.org/assets/Files/PDF/ROP/70E-A2008-ROP.pdf"]http://www.nfpa.org/assets/Files/PDF/ROP/70E-A2008-ROP.pdf[/url]
[url="http://www.nfpa.org/assets/Files/PDF/ROP/70E-A2008-ROC.pdf"]http://www.nfpa.org/assets/Files/PDF/ROP/70E-A2008-ROC.pdf[/url]


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed Feb 02, 2011 2:25 pm 
Offline

Joined: Fri Jul 10, 2009 8:57 am
Posts: 22
Location: Toronto
found it, thanks!


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Thu Feb 03, 2011 11:09 am 
Offline

Joined: Thu Jul 09, 2009 11:04 am
Posts: 14
Just to make sure that we are all on the page; Is it 70E-380 Log #143 EEW-AAA on page 147 of the first document submitted by Mr. Hilbert?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Thu Feb 03, 2011 2:05 pm 
Offline
Arc Level

Joined: Tue Jan 13, 2009 5:00 pm
Posts: 442
That one was accepted in principle. Page 154 70E-399 Log #435 EEW-AAA was the one actually accepted.


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 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:  
© 2017 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883