Derating THWN

[augie47]

When using THWN in a wet location, can you use the 90? rating for derating purposes as long as you don't exceed the 75? rating with the final load ?

 

[jumper]

I would say no. I know it is usually dual rated as THHN, but I cannot see that as applicable for a wet location.

 

[infinity]

It would need to be THWN-2 for a 90 degree conductor in a wet location.

 

[kwired]

It would need to be THWN-2 for a 90 degree conductor in a wet location.

I will second that response. Most of the THWN you are likely to find will have the -2 AFAIK.