XHHW-2

[Little Bill]

Would SER cable XHHW-2 HLPE Al conductors have to use the 60 deg column if run in the wall with insulation, or could it be used in the 75 deg column?

 

[Dennis Alwon]

What code cycle. Now it would be 75C

 

[Dennis Alwon]

I see you are on 2017 so 75C

(4) Installation Methods for Branch Circuits and Feeders.
(a) Interior Installations. In addition to the provisions of
this article, Type SE service-entrance cable used for interior
wiring shall comply with the installation requirements of Part II
of Article 334, excluding 334.80.
For Type SE cable with ungrounded conductor sizes 10 AWG
and smaller, where installed in thermal insulation, the ampacity
shall be in accordance with 60°C (140°F) conductor temperature
rating. The maximum conductor temperature rating shall
be permitted to be used for ampacity adjustment and correction
purposes, if the final derated ampacity does not exceed
that for a 60°C (140°F) rated conductor.

 

[Little Bill]

Thanks

 

[electrofelon]

Yeah it's hard to keep track of all the SER ampacity changes.

 

[augie47]

It seems kinda odd that we derate XHHW-2 in insulation or even in a conduit when the exception to310.15(B)(3) allows it to be installed on rooftops without derating. 110.14 is normally going to be the limiting factor anyway,.