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

[William Miller]

George:



Appliance manufacturers have their own requirements that are not the same
as the NEC requirements.  As long as you are not modifying the manufactured
assembly you are not responsible for compliance of that appliance.  By
appliance, I mean the solar module, microinverter, etc.



William Miller



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *George McClellan via RE-wrenches
*Sent:* Wednesday, November 8, 2023 9:06 AM
*To:* RE-wrenches
*Cc:* George McClellan
*Subject:* [RE-wrenches] Cable sizing for high current modules? NEC
interpretation/guidance?



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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