It is currently Sat Feb 24, 2024 6:33 am

Author Message

 Post subject: Table 130.4(E)(a) Note dPosted: 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

 Post subject: Re: Table 130.4(E)(a) Note dPosted: 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

 Post subject: Re: Table 130.4(E)(a) Note dPosted: 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

 Post subject: Re: Table 130.4(E)(a) Note dPosted: 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

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 4 posts ]

 All times are UTC - 7 hours

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

 Jump to:  Select a forum ------------------ Forum Library / Articles The Lounge    Question of the Week - What Do You Think?    Arcflashforum.com Feedback and Announcements    Off Topic Discussions    News in Electrical Safety Arc Flash and Electrical Safety    General Discussion    Electrical Safety Practices    Equipment to Reduce Arc Flash Dangers    Personal Protective Equipment (PPE) Arc Flash Studies    General Discussion    Arc Flash Labels    Software for Arc Flash Studies    System Modeling and Calculations    NEW! Electrode Configuration Library â 2018 IEEE 1584 Codes and Standards    CSA Z462 Workplace Electrical Safety    EAWR Electricity at Work Regulations, HSE - Europe    OSHA CFR Title 29    IEEE 1584 - Arc-Flash Hazard Calculations    NFPA 70 - National Electrical Code - NEC (R)    NESC - ANSI C2 - National Electrical Safety Code    NFPA 70E - Electrical Safety in the Workplace    2015 NFPA 70E Share It Here    Arc Flash Photos    Your Stories    What's Wrong Here? by Joe Tedesco
© 2022 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883