For a not-completely-unrelated question, what would the in-rush be if a typical 7200/240VAC pole transformer were to be back energized? Say, by a clueless homeowner supplying the grid? I tried to calculate this last night but couldn't find the right xfmr specs to work it out [Linked Image]

Dnkldorf: Personally? I'd keep the 5 transformers, but I'd bus them on both ends with ACBs, so that if I lost any of them, I could isolate it and use the others to assume the load. If I was designing new, I'd run the numbers first, but I'd probably just use 2, each capable of carrying the full load in case of failure. But then, efficiency savings from the transformers is very low on my priority list [Linked Image]

[This message has been edited by SteveFehr (edited 12-04-2005).]