hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Please see attached sketch. I have incoming 3 sets of 4#350kcmil incoming from utility to 800A service disconnect 208/120V three phase.
I have line side connection from 800A service disco to solar AC disco #1 400A and from 800A service disco to solar AC disco #2 400A. The lines side conductor tap from line side of service disco to solar AC #1 is 8#4/0 in one 4 inch conduit. The line side tap from service disco to solar AC #2 is 8#4/0 in one 4 inch conduit.
Questions:
1. For conductors from 800A service disco to solar AC Disco#1 that are 8#4/0 in one 4 inch conduit includes two phases A, two phase B, two phase C and two neutrals in one conduit. I don’t think you can put phase conductors of parallel sets in one conduit however I am not sure what would NEC 2014 code would apply to these solar AC output conductors?
2. Although solar AC #1 and solar AC #2 disconnects each 400A overcurrent add up to 800A which is the service rating, I am not sure it would comply per NEC 2014 705.12(A) or other section.
I have 3 sets of 350kcmil coming in. For both solar AC#1 and solar AC #2 disconnects each has 8#4/0. So that’s 16#4/0 total and of them 12#4/0 are phase. So this means Phase A conductors have 4#4/0 and if they are tap from 3 #350 kcmil phase A service this means one phase A service conductor would have 2#4/0 which would exceed ampacity of 350kcmil. Same thing with Phase B and Phase C. I am not sure if this would be not in compliance with NEC 2014 section 705.12(A) or any other NEC 2014 section?
I have line side connection from 800A service disco to solar AC disco #1 400A and from 800A service disco to solar AC disco #2 400A. The lines side conductor tap from line side of service disco to solar AC #1 is 8#4/0 in one 4 inch conduit. The line side tap from service disco to solar AC #2 is 8#4/0 in one 4 inch conduit.
Questions:
1. For conductors from 800A service disco to solar AC Disco#1 that are 8#4/0 in one 4 inch conduit includes two phases A, two phase B, two phase C and two neutrals in one conduit. I don’t think you can put phase conductors of parallel sets in one conduit however I am not sure what would NEC 2014 code would apply to these solar AC output conductors?
2. Although solar AC #1 and solar AC #2 disconnects each 400A overcurrent add up to 800A which is the service rating, I am not sure it would comply per NEC 2014 705.12(A) or other section.
I have 3 sets of 350kcmil coming in. For both solar AC#1 and solar AC #2 disconnects each has 8#4/0. So that’s 16#4/0 total and of them 12#4/0 are phase. So this means Phase A conductors have 4#4/0 and if they are tap from 3 #350 kcmil phase A service this means one phase A service conductor would have 2#4/0 which would exceed ampacity of 350kcmil. Same thing with Phase B and Phase C. I am not sure if this would be not in compliance with NEC 2014 section 705.12(A) or any other NEC 2014 section?
Attachments
Last edited: