To answer this question the units amperage must be stated or calculated.
The wire size depends on how much current it will conduct.
As a service entrance wire you need AWG # 3/0 gauge copper.
#6 bare copper wire.
Number 8. Rated for 40 amps
The size of conductor needed will be a #14. It should be copper and have an insulation factor of 90 degrees C. The fact that it is a three phase load does not enter into the calculation of the wire size.
The type and size of a wire for a 240 volt air conditioner will depend on the amperage the unit draws.
To calculate the wire size, a system voltage is needed.
The only way to determine the cable wire size needed for a 1000 watt air conditioner is to find the load size. To get the load size you will need to use the formula Amps = Watts or Volts. With that being said, you will need a number 14 copper wire.
You will need to use #8 wire.
To answer this question the voltage and load amperage is needed.
AWG 16
Wire size is based of the amperage of the device. To answer this question the amperage is needed or the wattage and voltage of the device.
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
6millimeter square.
The wire size depends on how much current it will conduct.
Wire size is calculated from the amount of current the load draws. More information is needed. Voltage and amperage will do fine.
The wattage of the water tank is needed to size the breaker and the wire to feed the tank.