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ac wire size

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Choose the wire size based on the minimum ampacity. 12 AWG wire has 20A ampacity; it鈥檚 too small. 10 AWG wire has 25A ampacity (above the required minimum of 20.45A). That means that we need to use a 10 AWG wire (or larger) for a 3-ton air conditioner. Most air conditioners with up to 5-ton capacity require from18 AWG to 10 AWGwire sizes.

People also ask


  • What size wire do I need for a central air conditioner?

  • Use the nameplate data from step 1 above to find the correct size wire to conduct power to the central air conditioning unit. Table 310-16 shows that three wires of 6-gauge placed in a conduit will safely conduct 65 amperes of power. The voltage range for this wire falls between 0 volts and 2,000 volts.

  • How do I determine the size of the wire on air conditioning?

  • Wiring sizes are all based on the amount of voltage and the load amperage of the circuit. Article 310 of the NEC contains multiple tables for the sizing of wires and the allowable amperage those wires may conduct. Locate the nameplate data tag on the air conditioning unit. This metal tag will be near the electrical connection box for the unit.

  • What is the size of the wire?

  • The larger the AWG number or wire guage, the smaller the physical size of the wire. The smallest AWG size is 40 and the largest is 0000 (4/0). AWG general rules of thumb – for every 6 gauge decrease, the wire diameter doubles and for every 3 gauge decrease, the cross sectional area doubles.

  • What type of wire is used in air conditioner?

  • Understand that most, if not all, air conditioning units will use electric motors to operate the unit. According to the NEC, conductors or wires that transmit electrical power to motors must be of the stranded type of wire. No solid wires may be used.

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