Derating factors and current carrying capacity of pv cable

[1st Solar]

Does anyone know which table I should be looking in to calculate the current carrying capacity of 4mm PV cable and also how to do the derating calc for the Non conformities in my MCS inspection?

I installed a 6 panel Mitsubushi system with the +ve and -ve legs of the string measuring 15m each, run in PVC conduit.

Two of the points this installaion was pulled for are

1/ No DC Cable de-rating factors available to view as per DTI guide 2/. No DC Cable volt drop calculations available as per DTI guide

All I've got is:
The Voc = 30.6v x 6 x 1.15 = 211.14v stc
The Isc = 8.13 x 1.25 = 10.6 Amps (as there's only one string!)
Segen used PV Sol for me and calculated 0.83v volt drop

I'm embarrassed to say, I dont know which table I should reference in 7671. I asked Napit and they weren't sure!
Please Help!

Regards Paul

 

[BruceB]

Ohms law works for dc and ac. When you are doing the calcs or using tables for ac you are dealing with rms voltages and currents. So the same calcs and tables will work for dc.
Regards
Bruce