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Old 01-20-2008, 09:56 AM   #1
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I have a 200 amp breaker box. I have to run the wire to from the meter to the breaker box at a distance of 150 yards underground. What size thhn wire do I need to run this?


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Old 01-20-2008, 10:18 AM   #2
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I am not a licensed electrician, but have had some minor experience in this, having done it with my own electrical service.

You need to first determine your load of your circuit. I think you have to add up the total wattage of everything that will be on the panel (over estimating is better) then go here.

Amperage Calculator

Once you have your Amperage, go here:

Voltage Drop Calculator

This should give you a pretty good idea.

For instance, if you actually had a 200 AMP load at 240 volts/single phase, at 450 feet, your talking about 350 mcm cable if you go with copper. $$$$$ It might be cheaper to have the power company move the meter.


Randell Tarin is offline   Reply With Quote
Old 01-20-2008, 11:28 AM   #3
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Spot on Randell.

I would definatly look at having the utility bring the service closer. They can run wire under different rules. It should be much cheeper.
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Old 01-20-2008, 12:49 PM   #4
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Google "voltage drop calculator"

Heh heh...or just click on the link someone provided ^
220/221 is offline   Reply With Quote
Old 01-20-2008, 05:17 PM   #5
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Or even better, keep a Pocket Ref. handy. I got mine from Ace Hardware, and has everything you can think of in it.
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