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That answer assumes the A/C is to be installed in a residential installation, because the service voltage is 240.
The length of wire-run should also be factored-in when deciding the correct wire size.
To get the right answers refer to the Wiring Codes or Regulations for your locality. (Town/State.)
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
For a double pole air conditioning unit, use a 240-volt wire with a rating that matches the amperage requirement of the unit. Typically, a 10-gauge wire with a 30-amp rating is suitable for most residential air conditioning systems. Be sure to follow local electrical codes and consult with a licensed electrician for installation.
For a 220 volt 100 amp breaker, you would typically need a wire gauge of 2/0 AWG (American Wire Gauge) or larger. It is recommended to consult with a professional electrician to ensure the proper gauge is used for your specific installation.
The current (amp) capability is determined by the wire size in gauge, rather than the voltage rating stamped on the insulation. The most basic rating is 20 Amps for 12 gauge and 15 Amps for 14 gauge wire; however, it can get more complex than that for long runs of wire or for wires run through conduit with other wires. Hire an electrician if this sounds bewildering.
It depends on the voltage, but if you are using it on a 240 v system, it's quite OK to use wire that can take 600 v (if you had to buy the wire, you would be spending too much).
I wouldn't, always safer to go heaver gauge. I recommend 8 gauge if you are going to be running any length of wire. Fire is never fun I believe the above answer assumes the question was meant to read, "30 amp 220 volt dryer." 12 gauge wire WILL NOT carry 30 amps safely. You need to run #10 copper minimum. It is never a bad idea to upsize, such as the recommended #8, but it is not necessary if 30 amps is what you need.
The recommended wire size for a residential air conditioning unit is typically 10 or 12 gauge wire.
For a double pole air conditioning unit, use a 240-volt wire with a rating that matches the amperage requirement of the unit. Typically, a 10-gauge wire with a 30-amp rating is suitable for most residential air conditioning systems. Be sure to follow local electrical codes and consult with a licensed electrician for installation.
The gauge of wire that is 12 volt is 18, 14, and 16.
The recommended wire size for a 220-volt electrical circuit is typically 10-gauge wire.
For a 220-volt electrical connection, a wire with a gauge of at least 10 AWG (American Wire Gauge) should be used to ensure proper safety and functionality.
Use 8 gauge wire.
The recommended wire size for a 220 volt circuit according to the 220 volt wire size chart is typically 10 gauge wire for a circuit with a maximum of 30 amps.
The recommended wire size for a 30 amp 220 volt circuit is typically 10 gauge wire.
The appropriate wire size for a 220 volt 30 amp circuit is typically 10 gauge wire.
10 gauge will work fine.
# 3 gauge
For a 220 volt circuit with a 30 amp capacity, the appropriate wire size would be 10 gauge wire.