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12-29-2008, 12:58 PM   #1
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## Ampacity 75 degree colum

Hello;

I've had a bit of confusion as to when it is allowable to use the 75 degree column of 310.16.

If THHN is run in conduit from one Cutler CH panel to another Cutler CH panel with no junctions in between, only 3 current carrying wires in the conduit. The Cutler CH breakers are listed at 75 degrees.

I found this on Mike Holt's site:

"(3) If the terminals are listed and identified as suitable for 75°*C, then conductors rated not less than 75°*C can be sized to the 75°*C temperature column of Table 310.16. See Figure 110-25"

Do I understand this correctly, in my described situation, connections between 2 CH panels, is it correct to use the 75 degree column in 310.6?

Thanks
Jamie

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12-29-2008, 01:51 PM   #2
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As long as the wire is rated for at least 75 degrees, and the devices or breakers the wire is landing on is rated for 75 degrees, then you can use the 75 degree column for ampacity. This does not apply to NM, which is limited to the 60 degree column.

12-29-2008, 09:14 PM   #3
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Quote:
 Originally Posted by InPhase277 As long as the wire is rated for at least 75 degrees, and the devices or breakers the wire is landing on is rated for 75 degrees, then you can use the 75 degree column for ampacity. This does not apply to NM, which is limited to the 60 degree column.
Thanks Much.

Jamie
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