[RE-wrenches] Cable sizing for high current modules? NEC interpretation/guidance?

[Bradley Bassett]

Hi George, It's good to see you're still with REC.

I'd assume this would fall under the purview of UL rather than NEC.
Anything that meets UL will pass NEC. With temperature derates I think
you'd have had to go to larger wire long ago to meet NEC standards.

It might be good to go to a larger wire to keep V drop low.

Brad Bassett
retired, but still interested.

On Wed, Nov 8, 2023 at 9:07 AM George McClellan via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Team;
>
>
>
> With the move to larger cells, some modules have an Isc that is pushing
> the limits of 12 AWG wire.  If I apply the rule of 156% (or 125% solar
> derate*125% continuous load derate) to an 18 Amp Isc module this will
> exceed the 25A that a 12 AWG wire can carry.  I understand that the
> homeruns will need to be a larger AWG (10 ga), but do the solar module
> cables (from junction box to MC4) also need to be larger?  Any guidance or
> reference material would be greatly appreciated.
>
>
>
> Thx,
>
>
>
> George McClellan | Senior Technical Sales Manager | REC Americas LLC
>
> 330 James Way Ste 150 | Pismo Beach, CA 93449 | USA
>
> Cell phone +1 805 704 3226 | Fax +1 805 357 6104
>
> www.recgroup.com | george.mcclellan at recgroup.com
> <shannon.kent at recgroup.com>
>
>
>
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