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Re: [TowerTalk] Nec PDF

Subject: Re: [TowerTalk] Nec PDF
From: Gene Smar <>
Date: Thu, 13 Sep 2012 07:51:02 -0500 (CDT)
List-post: <">>

Another pair of references that may be of value regarding electrical 
installations, especially installations with lots of switching power supply 
loads, is the IEEE Green Book (IEEE Std 142) and Emerald Book (IEEE Std 1100.)  
NEC rules are geared to providing a SAFE electrical system whereas the IEEE 
standards identify best practices for designing electrical supply systems of 
acceptable QUALITY, i.e., noise-free. The IEEE books talk about design issues 
such as increasing the size of circuit neutrals over NEC minimums so as to 
minimize voltage drop due to harmonics generated by switching power supplies 
and similar digital loads.

73 de
Gene Smar AD3F

On 09/13/12, Jim Lux<> wrote:

On 9/12/12 9:41 PM, Jim W7RY wrote:
> You have to buy it. They are about $100.00 You may be able to find an
> older used one on
There are a variety of ones as pdf on the web, as the NEC in various 
versions has been adopted as the local code. California Title 24 is an 
older version of the NEC..

Unless you just want to look up a section or two, where the pdfs work 
fine, if you want to *use* the code, I'd recommend getting the version 
with all the commentary and explanations. $150 ish for the latest one.

You can probably find one that is 1 or 2 revs out of date (every 3 
years)..not a huge amount changes.

Recently, there's been lots of changes in things like solar panels. 
Grounding/bonding is pretty much the same for the last 10-15 years.
Three phase neutrals had a big change about 20 years ago.

Obviously, if you're in the business as an electrician or Engineer, you 
need the latest one.

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