It is currently Sat Feb 24, 2024 5:16 am



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: Table 130.4(E)(a) Note d
PostPosted: Wed Aug 02, 2023 10:06 am 

Joined: Wed Aug 02, 2023 9:46 am
Posts: 1
If I am located in an area that is above 3000' in elevation how do I calculate or adjust my Restricted Approach Boundary?


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Table 130.4(E)(a) Note d
PostPosted: Mon Aug 28, 2023 7:10 am 
Sparks Level

Joined: Tue Jan 19, 2010 2:35 pm
Posts: 167
I don't think there is any modification for altitude.


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Table 130.4(E)(a) Note d
PostPosted: Mon Sep 25, 2023 10:26 am 

Joined: Tue May 22, 2012 12:08 am
Posts: 29
As the OP has implied, Note d under Table 130.4(E)(a) in NFPA 70E-2024 states that...
Quote:
The restricted approach boundary in Column 4 is based on an elevation not exceeding 900 m (3000 ft). For higher elevations, adjustment of the restricted approach boundary shall be considered.

You need to use the Altitude Correction Factor specified in Table R-5 of OSHA 1910.269...
- search for references to "Table R-5" at this URL: https://www.osha.gov/laws-regs/regulati ... 0/1910.269 (Table R-3 explains how to use the correction factor from Table R-5)


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: Table 130.4(E)(a) Note d
PostPosted: Tue Feb 06, 2024 11:35 am 

Joined: Tue Feb 06, 2024 11:24 am
Posts: 1
It is important to note that 2024 NFPA 70E Table 130.4(E)(a) Note d indicates that the restricted approach boundary in Column 4 is based on an elevation not exceeding 3000 ft. This very much seems like it applies to all voltage levels. If you look in OSHA 1910.269 Table R-3, it clearly indicates that the "altitude correction factor" is not used for voltages from 50V - 5kV.

As such, do we assume that the voltage correction factor does not have an impact for voltages less than 5.1kV?


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


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:  
© 2022 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883