wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
They aren't, and they just need educating that the requirements have changed?
Cheers, Wayne
upsizing EGC due to voltage drop
- Thread starter ellehktrick
- Start date
- Status
Cheers, Wayne
HoosierSparky
Senior Plans Examiner, MEP
- Location
- Scottsdale AZ
- Occupation
- Senior Plans Examiner
Wayne, I understand CA has amended the NEC for their CEC version to require #6. But what is the size that IS required for a 40A PV system on a 200A Main Service Panel per code? #10 or #6 bare copper?
wwhitney
Senior Member
- Location
- Berkeley, CA
- Occupation
- Retired
I don't see anything like that, but my familiarity with Article 690 is not thorough:
Cheers, Wane
ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
AHJs frequently have requirements that are not called for in the NEC, and convincing them that they should change their rules is frequently a futile effort. If it isn't a big deal, and this isn't, my advice is to give them what they want and move on.
HoosierSparky
Senior Plans Examiner, MEP
- Location
- Scottsdale AZ
- Occupation
- Senior Plans Examiner
OK, but what is the size that IS required for a 40A PV system on a 200A Main Service Panel per code? #10 or #6 bare copper?
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
It's #10 if it's in cable or raceway, assuming you haven't oversized the ungrounded conductors.
If it's a bare EGC on the array and exposed to physical damage (subject to AHJ interpretation) then there's a section in 690 that requires you to follow a section in 250 that requires #6, but just for that location. If AHJs are requiring #6 in conduit a raceway or cable as well, they are overreaching.
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