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.
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.
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.
Use 8 gauge wire.
# 3 gauge
AWG # 10 wire on 30 amp circuit.
The wire size depends on how much current it will conduct.
Depends on the size of the circuit which you did not list.
Wire size is governed by amperage not voltage. Voltage is an insulation factor when talking about wire. Add up the amperage of fixtures you want in the circuit. Once that is found then the size of the wire can be calculated.
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.
If it is a 110 volt light it can safely run on a 20 amp circuit with AWG # 12 wire.
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.
For a 60 amp circuit, a 6 gauge wire is typically used as the neutral wire. This wire size ensures proper grounding and safety for the circuit. Make sure to always consult the National Electrical Code (NEC) and local codes for specific requirements in your area.