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Oh wow an oldie. I have a 3k FerrUPS (only 120V) that I cant bring myself to throw out, but I cant bring myself to commission the unit either. After taking the batteries out it took every ounce of strength I had to get it into my truck bed without hurting myself. Im running a Liebert Nfinity...

Right, a 400A service with one of these boxes that is clearly not rated for 400A would be a problem. All of the equipment in this example would need to be able to support the full rated current, which in this case is 320A (as thats the continuous rating of a 400A service, but lets just say 400A...

Ive used them before and I have some similar ideas that Guy listed. I kind of kick myself for letting go of the one I had and wouldnt mind replacing it. PMs sent.