I am wondering if there is an adjustment factor for ambient temperature of 68 degrees f. I have eight number 10's awg, thhn in a 3/4" emt in a server room that is a constant 68 degrees f. By my calculations I am missing my 30 amp rating by .88 amps, but that is because the ambient temp chart only goes to 70 degrees for a adjustment of 1.04. Does this chart just stop at 70 degrees f. or is there more information that I can acquire in my calculation?
adjustment factors about ambient temp.
- Thread starter badashuka
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chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
Are you using the 90?C column for derating as per 110.14(C)?
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
Is there a reason you cannot apply 240.4(B) on this install?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The new table in the 2011 NEC {310.15(B)(2)(A)} goes down to 50? F.
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