Djd

[djd]

This is a theory question , we doing a solar project and wanted to know , DC wiring is not subject to derating correct ; beyond typical pipe fill and cable tray capacity. I cant name the type of wire but it is pv wire with a pretty thick insulation.

 

[luckylerado]

...DC wiring is not subject to derating....

Temperature and Distance affect DC circuits too.

Derating and correction and voltage drop should also apply to DC circuit conductors IMO. I see no discriminatory language.

 

[Dennis Alwon]

I agree. I don't see any exception for DC voltage ..

 

[ggunn]

This is a theory question , we doing a solar project and wanted to know , DC wiring is not subject to derating correct ; beyond typical pipe fill and cable tray capacity. I cant name the type of wire but it is pv wire with a pretty thick insulation.

There is one type of wire for which you do not need to use the temperature adder on rooftops - XHHW-2 (the exception to 310.15(B)(3)(c)), but there is no distinction between AC and DC wiring as far as derating ampacity is concerned.

 

[djd]

djd

djd

Thanks for all the insight on this , I really wasnt sure couldnt find it in the code book