Why do the manufacturers of many 120-volt wall/window air conditioners specify USE ON SINGLE OUTLET CIRCUIT ONLY.
Friday, August 9, 2019
Most general purpose wall receptacle outlets that you would plug a window air conditioner into are rated at 15 amps. The National Electrical Code (NEC) requires that any cord-and-plug connected appliance that is fastened in place be limited to 50% of the rating of a multiple outlet circuit to which it is connected. So a wall/window air conditioner with a rating of over 7.5 amps would require its own circuit. If the applliance is not “fastened in place,” such as a portable dehumidifier, then it is allowed to be up to 80% of circuit rating.
Also, see our blog post What are the most common problems with wall/window air conditioners?
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