310.15 B 1 & 310.15 B2

[Jake@01]

Can someone please help me clarify when exactly to use 310.15 b1 or b2. I completely understand they're for temp correction factors. One says based on temps other than 86 deg f & the other says 104 deg f. However one table has a column that goes from 50 to 185 deg f. The other goes from 50 to 437 deg f. So do I use 310.15b2 only if the temp is above 104 deg f & if it's below 104 deg f then I use 310.15 b1? Any clarity would be appreciated. Thanks

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[augie47]

B1 corresponds to 30°C conductors in 310.15(B)(16) ambient of 30°; B2 corresponds to 40°C conductors in 310.15(B)18, etc.,ambient of 40°

 

[Jake@01]

Thanks, realized that shortly after my post. Sometimes I ask stupid questions. When the answer is right in front of me.

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[augie47]

In my class a great number of folks go to the wrong Table. The fact that B2 is considerable larger may be a factor.

 

[Jake@01]

Thanks

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