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

[George McClellan]

Excellent.  Thanks for the update!


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<http://www.recgroup.com/> | george.mcclellan at recgroup.com<mailto:shannon.kent at recgroup.com>


From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of William Miller via RE-wrenches
Sent: Wednesday, November 8, 2023 9:14 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: William Miller <william at millersolar.com>
Subject: Re: [RE-wrenches] Cable sizing for high current modules? NEC interpretation/guidance?

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<http://www.millersolar.com/>
CA Lic. 773985


From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org<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<http://www.recgroup.com/> | george.mcclellan at recgroup.com<mailto:shannon.kent at recgroup.com>


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