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NEC exemptions

NEC exemptions

NEC exemptions

Are government installations (a naval base in this case) exempt from the NEC for their outdoor medium voltage (12KV) distribution system?

RE: NEC exemptions

Hi grimax,

I'm going to assume you mean the US Navy, please let us know if this is not correct.

You need to ask the Naval Facilities Engineering Command what codes and standards they enforce on your particular project.

Most of the projects I've done have required compliance with NEC for buildings and NESC for distribution, but there are exceptions -- and there are also many, many specific modifications to these codes that the Navy has adopted over the years.  

Good on ya,

Goober Dave


RE: NEC exemptions

One more thing --

NEC is not an IEEE code, you might consider asking for this post to be deleted, and re-ask in the Electrical Power and Distribution forum.  

Lots of experienced folks there.

Goober Dave

RE: NEC exemptions

Thanks for the info and direction.  My career has been in the NESC and I forgot the NEC is from the NFPA.
I'll re-ask also as you suggested.

RE: NEC exemptions

A clarification:
This is the correct forum to ask NEC related questions. It is just that IEEE is in the forum title to differentiate from the IEC world.  Note the forum title also implies the electrical codes issues in the IEEE world, where the electrical code is NEC. NEC is very much recognized and referenced in IEEE standards. It is also true that NEC is published by NFPA but NFPA forum is intended for fire protection related issues (and other non- NEC related questions.


Rafiq Bulsara

RE: NEC exemptions

My long-past experience with NAVFAC is that they expect designs to be done per the NEC. This would include 15 kV distribution systems.  I have been on bases where old distribution systems would not have met NEC, but I would think anything new would need to meet NEC.  But I think it is up to NAVFAC to decide.   

David Castor

RE: NEC exemptions

Rafiq, thanks for the clarification -- I'm not a long-enough-term member to have caught that.

As for NAVFAQ, I did have a chance to look through the most current design guides -- both NEC and NESC are stipulated in both low-voltage and base distribution system technical documents.

Try here:

[UFC Design Guides

Good on y'all,

Goober Dave

RE: NEC exemptions

Section 1.4 of Army TM 5-811-1 (also Air Force AFJMAN 32-1080) Title: Electrical Power Supply and distribution says "Paragraph 1-4. Standards and Codes.
Applicable industry codes, standards, or publications referenced will apply to equipment materials and construction covered herein.  The minimum requirements of the latest version of NFPA -70, The National Electrical Coce (NEC), and ANSI C2, The National Electrical Safety Code (NESC) will be met and excededed when more stringent requirements are specified and /or dictated."

You can down load the manual here http://www.army.mil/usapa/eng/index.html


RE: NEC exemptions

Thanks to all for the assistance - great resources!

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