Roger,
To clarify what I meant about your response, at 120V you can draw 200A or at 208V you can draw 200A not both at the same time and the same goes for the 120/240 1Ø or 3Ø, 200A at 120V or 100A at 240V. As you stated, of course all this is in theory since it all depends on the size of the transformers on the utility pole.
I am basing my questions on the idea that if you take (3) 1Ø transformer all of the same KVA rating that produce say 20A on the load side that you will get the following with the different configurations:
(Qty. 1) 1Ø transformer will give 20A @ 120V or 10A @ 240V 1Ø
(Qty. 2) 1Ø transformers wired into an Open Delta will give 20A @ 120V or 10A @ 240V 3Ø
(Qty. 3) 1Ø transformers wired into a Wye will give 20A @ 120V or 20A @ 208V 3Ø
All this as stated previousy that it is at one voltage or the other, not both at the same time.
