![]() ![]() Plug types are listed by their NEMA (National Electrical Manufacturers Association) classification and will often include a picture of the plug receptacle for your reference. If you’re installing a new unit, take note of the wattage, voltage and plug type indicated. A 20-amp 240-volt circuit calls for 12-gauge wire a 30-amp circuit calls for 10-gauge wire a 40-amp circuit calls for 8-gauge wire and a 50-amp circuit calls for 6-gauge wire. 7 coupon applied at checkout Save 7 with coupon. If you already have a committed outlet for your AC unit, you’ll want to try to select a replacement with the same ratings and plug type to eliminate the need of having a new outlet professionally installed by an electrician. Also, make sure the amperage of the breaker matches the amperage of the circuit wires and the appliance being powered. Chtaixi 3 Pole DIN Rail Mount Circuit Breaker, 32 Amp 240V AC Miniature Circuit Breaker, Thermal Magnetic Trip AC Disconnect. ![]() However, larger units that have higher energy requirements need a committed outlet to handle the electrical current required for operation. Smaller units with a 115 volt and 15 amp requirement will be able to operate off a standard household outlet. The lower two voltage ratings are common in smaller units, while units with a rating higher than 15,000 BTUs will require a 220-volt circuit. Adding a 240-volt baseboard heater usually requires a new 20- or 30-amp double-pole circuit breaker and new circuit wiring to supply one or more heater units. Most common voltage ratings for AC units are 115, 125 and 220 volts, and amperage rating can run from 15 to 20 amps. Since each leg of 240 volt circuit offers 120 volt potential to ground, then you’re getting two legs of out-of-phase 120 volt when you use double breaker, and doing so doubles the voltage and doubles the watts (power), it does not halve the amps. ![]()
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