Dont we have to use the more restrictive one?
Bob Ellison From: [email protected] [mailto:[email protected]] On Behalf Of William Miller Sent: Wednesday, January 22, 2014 7:32 PM To: RE-wrenches Subject: [RE-wrenches] Temperature Compensation calcs for wire Friends: I try to be rigorous in application of NEC codes to everything I do, including wire sizing. I understand that even though I am using conductors rated at 90°C, the breakers I use have terminals rated at 75°C so when deriving the values for ampacity for a given gauge from the tables, I have to use the 75°C column. What is not clear, however, is which column I use when applying temperature derating. Table 315(B)(2)(b) has a column for 75 and a column for 90. I am using 90° wire. The values for 90° are much more generous than the 75° values and I would like to use them. Which is correct? As always, thanks to everyone on this list for all of the help and advice. William Gradient Cap Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600 _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4259 / Virus Database: 3681/7023 - Release Date: 01/21/14 _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4259 / Virus Database: 3681/7023 - Release Date: 01/21/14
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