Posted by Texasmark1 on January 31, 2012 at 15:27:09 from (67.142.164.22):
In Reply to: House Electricity posted by Howard H. on January 31, 2012 at 15:04:25:
I don't know about underground as I haven't seen any, but around here all airborne utility service provider wire is alum. No reason submerged wiring wouldn't be alum sized appropriately, given the current price of copper.
My EE books quote wire sizing for a 2% line drop at full load and certainly distance is part of that as is wire resistance at the temperature of the delivery for the distance specified.
With all things equal, alum is usually the next wire size larger than what a copper wire would be, to carry the same continuous peak load at the same temperature.
Problem with 3 phase is that it is not made for single phase or 230V appliances so this whole thing sounds totally absurd to me!!!!!
Other than ground ref, it doesn't use a neutral and even though the individual legs are 115v (phase-n), (with no current carrying neutral per se) phase to phase is 120 degrees and not 180 degrees so the voltage is 208, not 230 and is low for single phase 230 volt appliances.
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