THW-2 #12 and #10 not listed in NEC 2008 Annex C Tables

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mshadel

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A question came up about how many #12 THW-2 conductors can be installed in a 1 inch EMT. Easy to answer, go to Annex C: Tables and look it up, but on all tables THW-2 is not listed for #12 and #10 conductors. My question is, is this a misprint or is there a reason why it is missing?
 
It's there {Table C.1} for #14 AWG and #8 conductors so I'm guessing that it's a misprint. Great test question.


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There is a huge discrepancy between Table c.1 and the actual Tables in Chapter 9. Chapter 9 tells us that 1" emt has an area at 40% of .346 sq. in. #12 thw-2 has an area of .0181. .346/.0181= 19 conductors. I would not use Annex C.
 
Annex C tables are not part of the code. They're only there for informational purposes. Having said that I'm not sure who at the NFPA would care about their accuracy.
 
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