Hi fellow inspectors.
I just wanted to get some second opinions on this, as it is new construction and may turn into a litigation inspection… So I gotta be really careful to be factually correct. I am not very experienced with a two (parallel) main panel set up in regard to grounding and bonding.
Here are the stats:
A. The meter is a 320 Amp rating (I think) See photo
B. The meter has a solid core ground wire to earth, 6AWG (I can’t determine the AWG of the electrical drop wires, as it’s locked in the sealed meter panel, but would a 6 AWG ground at a 320+amp meter panel be correct?)
C. Two (2) SEC panels are side by side, both with 200 amp main breakers.
D. The feeder wires from the meter to both panels are THHN 2/0 Copper. (Is this correct to use on a circuit feeding a 200 Amp main breaker?)
E. The left panel has a GEC wire of #4 AWG connected from that panel’s neutral/ground buss, which went back to the meter base panel (A). The right panel does not have this connection back to the meter base. (However, there is confirmed electrical continuity between left and right panel. I assume there is continuity between the panels because of the neutrals are connected together in the meter panel)
F. I did not observe any other connection to common points of ground for either panel (earth, UFER, or cold water pipes. (If there are any, they are concealed and are less then 10 AWG) I feel that both panels should be bonded to two separate points, Earth and UFER or a cold water pipe, and that the bonding wires must be 4AWG copper or larger.
My understanding is that essentially the panels are totally parallel; it’s two separate 200 amp service entrance panels, not 400 amp, with probably a 320 amp total capacity between the two panels. But I feel both panels must meet the bonding and grounding requirement like they are individual panels… is that correct thinking.)
Additional observations about the panel and electrical system at first inspection:
G. There was a 240 volt pool pump in panel (2 each 110 VAC breakers) with no common trip. This is already fixed.
H: Thee left phase connection to right panel was never tightened. There was significant heat rise on this wire, See IR photos of panels.
I. There is no AFCI protection in this home.
J. There is missing GFCI protection at several required places.
I would greatly appreciate the opinion of highly experienced electrical inspectors/ electricians…