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Q: What size wire to use for 100 amp service 160 feet from the power pole?

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For an accurate calculation it will be necessary to know what the size of breaker exists in the pump house and what size conductors are used. Power loss is measured using actual amps required, not size of the circuit involved. But the size of circuit (breaker size) can be used. Voltage must also be known.

20Sqmm

This is a voltage drop question. To receive an answer to this question the voltage of the service must be stated.

That can't be answered until you state the voltage.

Assuming its copper. Number #3 or #2 is fine

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Contact your local Electric provider for the correct size wire and any other rules they have in place. Do it wrong and you will just do it again.

Answer for USA, Canada and countries running a 60 Hz power supply service. 230 to 240 volts on any size two pole breaker on single phase installations. The voltage varies from location to location from different utility power companies.

If that is continuous draw and not start, then I would use 8awg.

For an accurate calculation it will be necessary to know what the size of breaker exists in the pump house and what size conductors are used. Power loss is measured using actual amps required, not size of the circuit involved. But the size of circuit (breaker size) can be used. Voltage must also be known.

This is a voltage drop question. To answer this question a voltage needs to be stated. This is a calculation for a 120/240 service. A 3/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 50 amps for 500 feet on a 240 volt system.

# 6 copper wire.

20Sqmm

measure the circumference of you pole

Choosing the right size depends ont he size of your home in feet and the number of appliances.

This is a voltage drop question. To receive an answer to this question the voltage of the service must be stated.

No. The South Pole is a GPS location, which does not change in size.

Briefly, half a section is half the size of a full section.For instance, a pole that is 14 feet long , half of the length (section) would be 7 feet.