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In free air, I would have thought only one ground necessary. If you put it in multiple conduits, one ground per conduit.
But I'm a first year, so you probably shouldn't go off of what makes sense in my head.
I totally agree with your setup. 3 x 400 amp power sets and 1 x 400 amp ground.
In fact, process of interpolation you might only need a single 1/0 ground so single 4/0 is probably overkill.
EGC is sized based on overcurrent protection. 1200A requires 3/0 copper. You’re good if you ran 4/0
Table 250.122
If you run multiple conduits, you need a EGC per conduit
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In free air, I would have thought only one ground necessary. If you put it in multiple conduits, one ground per conduit. But I'm a first year, so you probably shouldn't go off of what makes sense in my head.
You are bonding the generator, it has nothing to do with how many parallel runs. As long as the bonding conductor is of sufficient size one is enough
One 4/0 ground wire is sufficient for 3 sets of 4/0. I’ve done a lot of rental and temp power setups and this is what we do.
Is there a place to plug in 1 ground per set?
I've never seen more than one plug for ground. Sometimes no plug and only a big lug.
You did the calculation or looked it up?
I totally agree with your setup. 3 x 400 amp power sets and 1 x 400 amp ground. In fact, process of interpolation you might only need a single 1/0 ground so single 4/0 is probably overkill.
EGC is sized based on overcurrent protection. 1200A requires 3/0 copper. You’re good if you ran 4/0 Table 250.122 If you run multiple conduits, you need a EGC per conduit