I would recommend no smaller than #8awg copper. This is derived by 8awg copper ampacity of 40 amps multiplied by 80% load rating to get 32 amps. Then calculating for voltage drop over this distance shows a drop of 5.9 volts or 2.5% which is negligible so not accounted for. So like i said no smaller than #8awg copper.
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For a 110 volt 20 amp circuit running 700 ft, it is recommended to use a wire size of 8 AWG (American Wire Gauge) to ensure that voltage drop is within an acceptable range. This will help maintain a safe and efficient electrical system for the circuit over that distance.
This is a voltage drop question. A #2/0 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 700 feet on a 110 volt system.
If there is a possibility of using a 220 volt source the wire size can be changed to a #3 copper conductor will limit the voltage drop to 3% or less when supplying 20 amps for 700 feet on a 220 volt system.
Answer Using stranded copper: Minimum of 2 AWG
Using stranded aluminium: Minimum of 4/0 AWG.
A #1 copper conductor will limit the voltage drop to 3% or less when supplying 30 amps for 700 feet on a 240 volt system.
A #8 copper conductor will limit the voltage drop to 3% or less when supplying 28 amps for 140 feet on a 240 volt system.
This is a voltage drop question. A #2/0 copper conductor will limit the voltage drop to 3% or less. This calculation is for supplying 20 amps over 700 feet using a 110 volt system.
AWG # 10 wire on 30 amp circuit.
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
The size of the wire is set by the maximum current it has to carry. The voltage sets the size of the insulation. In the UK a 230 v (nominal) ring-circuit supplying a set of power sockets is rated at 30 amps and uses a ring of 2.5 sq-mm cable.
For a 70 amp service at 240 volts, you would typically use a wire size of 4 AWG copper wire. This wire size is suitable for carrying 70 amps of current safely over a 240 volt circuit. Be sure to consult local electrical codes and regulations to ensure compliance with requirements in your area.
For a 225 amp 208 volt 3 phase circuit, you would typically need to use a 3/0 AWG copper wire or a 250 kcmil aluminum wire. Be sure to consult with local electrical codes and regulations to ensure compliance with specific requirements for your installation.