If my failing memory serves me correctly, the area of a circle is Pi times the radius squared. Your math above seems good but unless I am totaly off base, I think it is flawed in that wire is provided to you in measurements of diameter but it is the total wire volume that is able to carry the load. I am changing my mind on the building site since I was hoping to build my 40'圆0' shop for less than $25,000. However this gives them room to build work shops and such and have enough service amps to carry the extra load.ĭo you know what the load amps will be of whatever your are needing the 200 service to?Ĭlick to expand.I had the same problems with a 400' run at 200A and found out that it would cost me about $16,000 to install under ground. They may be hooked up to a 200 amp service and their demand load may only be 90 amps. A lot of houses have a overkill on the service amps. But if your house has a small calculating load you may not need to worry about voltage drop even at 260 feet. Most generally a 4/0 URD cable is run from the meter pole to the 200 amp panel box. Voltage drop calculation would be divided by Circular mil of conductor used.Ģ X Resistance X Lenth X load amps divided by cm of wire.Īssuming you want to run this 200 amp service to a new house your building is there anyway you could get the electrical company to place the meter pole closer. If the load calculation comes up to 179 amps and you have a 200 amp service, then the 179 amps is what you would use in you voltage drop calculation. When a electrical contractor wires your house they are suppose to do a load calculation of your home to determine the size of service for your home. Just because you have a 100, 150,175,200, 400 amp service doesn't mean that's how much your load is. To calculate service drop you will have to know the load amps of your house or what ever it is your running the 200 amp service too. Just what will this service cable be running to? I think you need to use the full capacity when calculating wires, but at the end box you should only assume 80% is there.īut again, I'm just a simple farmer, get better advice than mine. Looks like double aught would only carry 100 amp or less at this distance? Need more than that for such a long distance, for sure. That is what the pros used to make 200 amp runs like that on my place a few years ago. Says 350 mcm which is about the size of your thumb. Maybe you can find different one that gives you a better answer. Some folks want to do the whole 5% drop in the feed wires. I think they use 3% drop, assuming you will get more drop in the wires in the building, making a total of 5% allowable drop. I donno, electric motors will be happy if you don't get by with too much less. I'm told it is a little bit harsh, you can get by with less. I use this voltage drop calculator to play 'what if' stuff.
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