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# 800 feet run for 50 amp service what size wire?

Updated: 8/9/2023

Wiki User

13y ago

To answer this question the following is needed. The voltage of the circuit, whether single or three phase. To calculate whether additional de-rates have to be applied the type of wiring system should be stated, overhead, direct bury or conduit system.

A single conductor single phase will need a #3 copper conductor and will limit the voltage drop to 2.93% when supplying 30 amps for 250 feet at 120 volts.

A single conductor single phase will need a #6 copper conductor and will limit the voltage drop to 2.76% when supplying 30 amps for 250 feet at 240 volts.

A single conductor single phase will need a #8 copper conductor and will limit the voltage drop to 2.16% when supplying 30 amps for 250 feet at 480 volts.

A single conductor single phase will need a #10 copper conductor and will limit the voltage drop to 2.62% when supplying 30 amps for 250 feet at 600 volts.

A single conductor three phase will need a #10 copper conductor and will limit the voltage drop to 2.84% when supplying 30 amps for 250 feet at 480 volts.

A single conductor three phase will need a #10 copper conductor and will limit the voltage drop to 2.27% when supplying 30 amps for 250 feet at 600 volts.

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Single phase or 3 phase it doesn't matter. 30 amps is 30 amps.. Above your head or in the ground its still 30 amps.. 10awg is usually good for 30 amps but, with this voltage drop I would run 6awg.

Wiki User

13y ago

Anonymous

Lvl 1
3y ago
220v 3 phase

pug907

Lvl 1
1y ago
thankyou for some basic clarity on the issue --i will overdue the size of wire to compensate for the amperage needed and absorb the droppage at approx. distance I stated at --thkz again
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Wiki User

13y ago

The National Electrical Code is a valuable source to find answers to this type of question since there are many more factors to selecting proper wire size than just distance and current requirements.

Also, you should check with you local building inspection department to determine if there are stat or local code requirements that exceed the National Electrical Code.

Wiki User

14y ago

The answer to this depends on many factors. I would recommend consulting a professional electrician, or familiarizing yourself with at least Article 310.16 of the National Electrical Code.

Wiki User

13y ago

To answer this question the voltage and phase of the service is needed.

Wiki User

13y ago

Assuming the voltage is 240 volts, the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 %, the wire will be 3/0 in size.

Wiki User

15y ago

#4 awg Copper Wire

Anonymous

Lvl 1
3y ago

#6awg