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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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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