National Electrical Installation Standards

Standards as High as Your Own

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Tuesday, February 12, 2019

Question:

Greetings to you folks at CQD, while looking up some information regarding the definition of "coated" and "uncoated" wire, I ran across a CQD at the following link: http://www.neca-neis.org/code-question-of-the-day/code-question/cqd-for-11-4-2005

In the answer part of that CQD is found this language: "The overall CSA of both bare copper and tinned copper for a given size was the same, therefore, you will find that the resistance values for tinned copper conductors is slightly more than that of bare copper."

My question is this: What is meant by "CSA" in this answer?  The word "diameter" would seem to make sense in place of "CSA," but I hate to assume…

Thanks in advance for your help!

Johnie Spruiell

A

Answer:

Hey Johnie thanks for your question. Table 1 in Chapter 9 of the NEC has a heading titled "Cross-Sectional Area(%). The area can be determined from the diameter but it is often the area that is used in the NEC. Later tables, including Table 8 which includes coated and uncoated conductors, use only the term "area" so possibly there is an opportunity for making changes to be consistent.

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