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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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