Posted by Greg K on January 31, 2012 at 18:15:32 from (75.104.160.54):
In Reply to: House Electricity posted by Howard H. on January 31, 2012 at 15:04:25:
When I was in apprenticeship class they were teaching us about voltage drop. Just out of curiosity I figures out what it would take to run a 100 watt bulb at the end of mom and dads 1/2 mile long driveway. The number I came up with was just about the same as the size of wire that I would use to run a 200 amp service! The power company is telling the truth. If I remember right the equation is something like, 2 x length x resistance x ampacity / circular mills of wire= voltage drop, which is 2% for branch circuits and a total of 5% for everything including the service. so if your length is 2500 feet roughly and you are using direct bury aluminum wire which has a rough resistance of 21 and the voltage is 120/240 single phase and the service size is 200 amps that would work out to be about 1,750,000 circular mills. Which means that you would have to run parallel 1 million circular mil wire, which is possibly not made, and is probably about 1 1/2" thick. This is just a rough idea but gets the idea across.
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