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For my own sanity.... not being very electrically inclined, IF ( as described in post #11 ) Valence had no 240V loads and decided that he wanted full rated output from his 803A and put it into 120V only mode, with all the load on L3, wouldn't he have 104A on L3 and not 52A?
I assume you mean you can not have more than 52A per leg when operating in 240V mode, not 120V mode?
In theory, yes, you could load it up that way. I cannot fathom a situation in which you would do that though, unless you had one giant single phase 120v motor or something like that.
For normal operation, I would assume that one would have a regular ole split buss 240v panel that would utilize two legs of 120v to achieve the full rated load of 104 amps.
If there's something that I'm missing, please correct me! I personally have never seen any instance where a mulit-branch circuit panel has only one leg of power input.