It is currently Sun Oct 22, 2017 4:57 am



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Shock Protection PPE Question
PostPosted: Wed Jun 17, 2009 1:22 pm 
Offline

Joined: Fri Jan 02, 2009 2:02 pm
Posts: 19
As I understand it - if you cross the Restricted Approach Boundary with a body part, which most likely would be your hands - you need to wear shock protection (NFPA 70E-2009 130.2(C).
The Restricted Approach Boundary for 120V, 208V and 240V ac is "Avoid Contact" per Table 130.2(C). If I am performing a voltage measurement on these voltages I do not need to wear rubber insulating gloves. My hands would be insulated via the test probes AND my hands have not crossed the Restricted Approach Boundary. We do wear leather gloves when using a meter.
Also, the electricians wear rubber insulated gloves with leather protectors on 277V and greater.

What do you think?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Wed Jun 17, 2009 6:33 pm 
Offline
Arc Level

Joined: Thu Jan 10, 2008 8:49 pm
Posts: 480
Location: New England
Are you doing this work under the IEEE method or the NFPA Task Table method. If you use the table, then you have to conform to the yes or no column for shock protection. If you are following IEEE then shock protection is only required when passing the Restricted Approach boundary.


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Thu Jun 18, 2009 5:13 am 
Offline

Joined: Fri Jan 02, 2009 2:02 pm
Posts: 19
We performed an arc flash study, we do not use the table. All of our 240V and under panelboards and lighting panels are fed by transmformers less than 125kVA (actually they are 25kVA or less). The task table for 240v and below is referring to panelboards and lighting panels - that is my opinion based upon the tasks listed. What about I/O panels using 120vac?

What is the IEEE Method?


Top
 Profile Send private message  
Reply with quote  
 Post subject:
PostPosted: Thu Jun 18, 2009 7:51 pm 
Offline
Arc Level

Joined: Thu Jan 10, 2008 8:49 pm
Posts: 480
Location: New England
I look at 120v branch feeders that are fed out of under 240V 125kva xfrms to also be exempt from analysis. That to me is simple logic. If IEEE could not sustain an arc from the feeder to the panel main, it certainly won't happen from a 20a branch circuit with 200ft of #12awg.


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 2 guests


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