Let's say we have two identical buildings. Both buildings have identical loads (lighting, power, small motors, pumps). One has 575V 3ph service (w/step down for lights and power) and the other building has 208V 3ph service. Would the hydro bill be significantly different on these two buildings if at all?

Well, I would say no. Power is watts and watts is power no matter voltage or amps. If there was a difference I think it would be marginal and due to other influences not disclosed in your question.

I agree with Bob, the cost would be the same. Should be no difference in the KWH each month.

Wouldn't your kwh useage be higher for the 575 due to losses in the xfrm with heat production?

Well, like I said, there may marginal differences if taking every variable into account. I believe it's watts that determines BTU, not just volts.

The only savings difference is in building construction matrial with 208 to 575 it can be large.I forget how it was explained but you basicaly save on copper.

You would have transformer losses at 575 that you don't have at 208. On the other hand, I have heard that some electric companies adjust the rate to account for transformer losses if you take a higher-voltage feed.

On the other, other hand (I have lots of hands), the I^2R losses for distribution will be lower at 575.

However, in the final analysis, the choice of voltage isn't going to have any effect at all on your water bill.

[This message has been edited by SolarPowered (edited 04-06-2005).]