Bundling lots of string conductors

[electrofelon]

Double check me here:

Module isc= 8.85A, #10 copper PV Wire, assume no ambient temperature adjustment. Am I correct there is no limit on how many conductors can be bundled together?

 

[jaggedben]

As long as it's 90C wire, then yes, I believe you're correct.

I get that the wire ampacity is 14A and your circuit current is 13.8A.

 

[electrofelon]

As long as it's 90C wire, then yes, I believe you're correct.

I get that the wire ampacity is 14A and your circuit current is 13.8A.

Thanks, that's what I get

 

[pv_n00b]

Just so folks know where this is coming from. The ampacity adjustments in Table 310.15(B)(3)(a) Adjustment Factors for More Than Three Current-Carrying Conductors applies to conductors in conduit or conductors that are bundled for more than 24". If you derate your PV DC conductors to 35% of the rated ampacity you can put as many as you want in a bundle. Ref; 310.15(B)(3)(a). A #10 90°C conductor is rated for 40A and 14A at 35%.

 

[ggunn]

Just so folks know where this is coming from. The ampacity adjustments in Table 310.15(B)(3)(a) Adjustment Factors for More Than Three Current-Carrying Conductors applies to conductors in conduit or conductors that are bundled for more than 24". If you derate your PV DC conductors to 35% of the rated ampacity you can put as many as you want in a bundle. Ref; 310.15(B)(3)(a). A #10 90°C conductor is rated for 40A and 14A at 35%.

But don't forget your temperature derate.

 

[GoldDigger]

But don't forget your temperature derate.

Including roof adjustment if applicable to your install and your code cycle.