Generally most whole-house air conditioners (for modest size houses) are served with a 30A circuit using 10AWG wire in 10/2 cable. This can be configured at 15, 20 or 30A, at 120V or 240V. There is nothing wrong with wire that is too big. You can put a 20A receptacle on a 20A breaker on #6 wire.

What size cable do I need for my air conditioner?

To calculate wire size for air conditioners, divide the maximum current by 80% to find the circuit breaker size. Next, use the wire length and a voltage drop of 2.5% to get the allowable voltage drop. Finally, choose the suitable wire size based on the circuit breaker ampere and the allowable voltage drop.

Which cable is good for air conditioner?

10/2 wire is recommended because air conditioners are considered as single-circuit appliances.

What size wire do you run for a mini split?


1. What size wire do I need for a mini split? For most ductless mini-splits, the right wire is a 14/4 stranded conductor cable. Mini-split wires are used to connect the outdoor compressor unit with the indoor evaporator unit, delivering electricity and control signals.

How do I choose cable size?

To calculate the Cable Sizing one needs to divide the voltage running through the cable by the target current. For instance, If your wire has a voltage current of 150 Volts and your target is 30 then you divide 150/30. This gives you your target resistance of 5 which is required.

How do I determine electrical cable size?

  1. Look at the insulation on the cable. Search for text written on the insulation. …
  2. Cut the wire with your wire cutters. The cut should be perpendicular to the run of the wire.
  3. Measure the diameter of the cross-section in inches. …
  4. Divide the diameter of the wire by .
  5. Is 4mm cable OK for air conditioner?

    4mm wire is air conditioning, kitchen and other high-power appliances. The size of the cross-sectional area of the wire indicates the ability of the wire to carry current.

    Can a mini split be plugged into an outlet?

    A 110v mini split AC is typically wired to an AC disconnect and then into the breaker box. However, many have simply wired it directly into a standard outlet receptacle, or even to a standard plug, to plug into a receptacle as a standard appliance, and without any AC disconnect.

    How many amps are required for a ductless mini split?

    Typically, you will need between 15 and 45 amps per mini split. That is about 110 to 120 volts on the low end and 208 to 240 volts on the higher end. Anything that runs on amps must have a circuit to prevent amp overload. This would cause your circuit breaker to trip and your power to go out.

    Does mini split wire need to be shielded?


    These cables contain four #14 gauge, stranded wires. Two wires in the cable are for powering the indoor unit and two provide communication. Sometimes this cable is shielded. If you do use shielded cable it is important to only ground one end, not both.

    Can I use solid wire for mini split?

    You should use the 14-gauge, 4-conductor wire for most mini-split systems. It would be best to use stranded wires since a solid-core wire might result in many issues. You should use an armored cable if you’re using the unit in a commercial HVAC application.

    What size wire do I need for a 2 ton AC unit?

    Air Conditioner Wire Size Chart (1.5-5 Ton Units)

    Air Conditioner Tonnage: Max. Wattage (At 10 EER): Min. Wire Size:
    2 Ton 2,400 Watts 18 AWG Wire
    2.5 Ton 3,000 Watts 14 AWG Wire
    3 Ton 3,600 Watts 12 AWG Wire
    3.5 Ton 4,200 Watts 12 AWG Wire

    How many amps does a 24000 BTU Mini Split use?

    MrCool 3.5-ft 24000 BTU/H Mini Split Air Conditioner and Heat Pump, 25 Amp, 1-PH, 230V, White

    Discontinued MrCool 3.5-ft 24000 BTU/H Mini Split Air Conditioner and Hea…
    Heating Capacity
    Highest Decibel Rating
    Maximum Amperage 25 Amp
    Maximum Voltage 230V

    Does a mini split need a double pole breaker?

    You need a minimum 25 amp breaker for mini split systems up to 24,000 BTU/2 tons. A 30 amp breaker is sufficient for 36,000 BTU/3 ton systems, and a 50 amp breaker meets requirements for larger units to 60,000 BTU/5 tons.
    1 – 5 ton Mini Split AC Breaker Size.

    Mini Split Ton Volt Break Size
    5 Ton 220v 50 Amp

    Does a mini split need a dedicated circuit?

    You might be wondering, “Do I really need a disconnect?” All mini split systems require a dedicated circuit to supply power to the system. A disconnect box is required by code to be installed near the outdoor unit and allows for a technician to shut off power to the system when performing any service or repairs.

    Do air conditioners need their own circuit?

    Your air conditioner must have a dedicated circuit so you can have peace of mind knowing that it’s less likely to trip and that your electrical system will work more efficiently. It’s also important to do this if you’re looking to install an AC system for the first time or your home has an outdated electrical system.

    Can an air conditioner be plugged into a regular outlet?

    Window units with standard, three-prong plugs may be used in regular household outlets, regardless of whether the air conditioner requires 110-, 115-, or 120-volt electricity. No special outlet is required. However, if the unit has a round plug, you may consider changing the wall outlet to match it.

    Can an air conditioner share an outlet?

    Even if the AC does cause a current drop when it kicks in (like my printer does), it shouldn’t be a problem. The UPS will just kick in for a second. Typical house receptacle is 15 amps.