Does Table Annex C have correct fill for THHW, THW, and THW-2 sizes 14, 12, 10 and 8?

[nercGerald]

It looks like these wire sizes and insulations should have the same fill as TW since they have the same cross sectional areas as TW. But they are grouped with RHH*, RHW*, and RHW-2* in Tables C.1, C.2, C.3, C.4, C.5, C.6, C.7, C.8, C.9. C.10, C.11, C.12.

 

[curt swartz]

Apparently the NFPA has some incorrect wire information. TW has a thinner insulation and is smaller in diameter than the others.

 

[dkidd]

Take a look at

http://www.electrical-contractor.ne...296_errors_in_Annex_C_Tables_.html#Post198895

They have a proposal in preparation that addresses this.

 

[curt swartz]

Take a look at

http://www.electrical-contractor.ne...296_errors_in_Annex_C_Tables_.html#Post198895

They have a proposal in preparation that addresses this.

dkidd you posted a link to a post from the same person. The NEC has incorrect information on the wire properties. TW does not have the same insulation thickness as the others.

 

[dkidd]

OOPS. He gets around.