Derate 4/0 feeder

[daiashi]

In my area in nc, inspectors are calling people using the spaces
on an outdoor 200amp disconnect to feed anything but the indoor
loadcenter.Ex. branch circuit to a heatpump.If the available spaces
outdoors are used then you have to derate the indoor feeders.Any ideas?

 

[Dennis Alwon]

In my area in nc, inspectors are calling people using the spaces
on an outdoor 200amp disconnect to feed anything but the indoor
loadcenter.Ex. branch circuit to a heatpump.If the available spaces
outdoors are used then you have to derate the indoor feeders.Any ideas?

this can mean that T.310.15(B)(6) does not apply since it doesn't carry the entire load of the service. Is that what you mean?

 

[Buck Parrish]

I think it has some thing to do with 310.15(b)6
I am not sure derate is the proper terminology in this case.
It is the new ampacity's allowed .
It's a pain , heh?


Okay Dennis beat me.

 

[daiashi]

Thats the best idea I can come up with.By using the outdoor buss,
you are no longer allowed to use 310.15(B)(6) but 310.16.This
sound correct?

 

[augie47]

we had a lengthy discussion on this subject on the thread listed below. It involves 310.15(b)(6), 215.2, and 338.10. Various opinions are given by different "experts"



http://forums.mikeholt.com/showthread.php?t=107984&highlight=Minick

 

[daiashi]

Thank you