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.
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.
Answer for USA, Canada and countries running a 60 Hz supply service.240 volt two wire circuits loads do not need a neutral to operate. A three wire 240 volt circuit that needs a neutral, will have a neutral the same size as the current carrying conductors. In this case a #10.
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
No, not a good idea. You have to use a 347 volt ballast.
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.
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.
Answer for USA, Canada and countries running a 60 Hz supply service.240 volt two wire circuits loads do not need a neutral to operate. A three wire 240 volt circuit that needs a neutral, will have a neutral the same size as the current carrying conductors. In this case a #10.
The ground wire in a two or three conductor #12 cable is a #14 bare ground wire.
No, not a good idea. You have to use a 347 volt ballast.
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.
I would use AWG # 4 copper.