I have gone back and read previous posts until I have confused myself (easy to do), so I have to beat this dead horse again.:smile:
Situation: 1200 amp service (with main)
PVC conduits undergroud. Contractor elects to istall all of phase A in one conduit, etc. 4 wires per conduit
No metallic enclosures, fittings etc. so, I believe, 300.4(B)(3)allows the install.
However, from reading past postings, derating still applies so 350 kcmil x 4 x .80 = 1120, so we have a violation.
Had we run each phase per conduit, with neutral considered a non CC conductor, no problem.
Is my thinking correct ?
Situation: 1200 amp service (with main)
PVC conduits undergroud. Contractor elects to istall all of phase A in one conduit, etc. 4 wires per conduit
No metallic enclosures, fittings etc. so, I believe, 300.4(B)(3)allows the install.
However, from reading past postings, derating still applies so 350 kcmil x 4 x .80 = 1120, so we have a violation.
Had we run each phase per conduit, with neutral considered a non CC conductor, no problem.
Is my thinking correct ?