Table 310.15 B11 VS 310.15B12 ambient temp correction

ramsy said:
IMHO, less thermal imaging reports would follow overheated wire if more electricians paid attention to 220.18 for inductive ballast & motor loads, where current rises with voltage drop.

The equation wants Amps, reminding electricians Watts is useless without knowing Power Factor.
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You can solve for the unknown power factor using watts and dividing by voltage x amperes for single phase hower

Power factor changes/ varies depending on which loads are on during testing?
 
wwhitney said:
Hopefully the 2023 NEC settles your concerns. The notes to each of the two tables correction factor tables specify which ampacity tables they may be used with. And we've explained multiple times the logic involved.

Cheers, Wayne
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I Have known this but my concern was something else. Perhaps i need to explain it another way
 
Jpflex said:
That is what i said 86 deg ferenheight* or 30 deg c. However thus was not my point. My point was for ambient temperatures other than 30 and 40 which may fall into both tables. No one is getting this?
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You said 86 deg c., which is not 86 deg F.

The point is the ampacities in 310.16 are based on a 30degC ambient. And 310.16 tells you use the "other than 30degC" correction factors for ambient temperatures other than 30degC.

The other than 40degC correction factors are completely irrelevant to 310.16. Why are you not getting this?
 
Yes i see it here in the picture 310.15B 12 but my page didn't have that note. Yes it makes sense now that the second table only applies to certain ampacity tables which i could not see before.

And you would only use thesetables 310.18, 310.19, 310.2p and 310.21 for wiring methods not terminating onto a utilization equipment rated 60/70 degrees c?

Thanls
 
david luchini said:
You said 86 deg c., which is not 86 deg F.

The point is the ampacities in 310.16 are based on a 30degC ambient. And 310.16 tells you use the "other than 30degC" correction factors for ambient temperatures other than 30degC.

The other than 40degC correction factors are completely irrelevant to 310.16. Why are you not getting this?
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Yes i wrote 86 degrees c but i meant to write f. I figured the problem was a note at the bottom of the tables that were not in my tables. Well that solved that. Lol

Anyways thanks yall lol
 
david luchini said:
You said 86 deg c., which is not 86 deg F.

The point is the ampacities in 310.16 are based on a 30degC ambient. And 310.16 tells you use the "other than 30degC" correction factors for ambient temperatures other than 30degC.

The other than 40degC correction factors are completely irrelevant to 310.16. Why are you not getting this?
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Wwhitney sent the pic. Mine had no footnote
 
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