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Air Conditioner Size and Room Electrical Circuit

The NEC states that the total rating of a plug-connected room air conditioner, where lighting units or other appliances are also supplied, shall not exceed…

Electrical Code for Room Air Conditioners
Question: The NEC states that the total rating of a plug-connected room air conditioner, where lighting units or other appliances are also supplied, shall not exceed what percent of the branch-circuit rating.
Background: Eddie is a Student from Sacramento, California.

Dave’s Reply:
Thanks for your electrical question Eddie.

Where the branch-circuit supplies lighting outlets and general use receptacles, the total rating of a plug-connected room air conditioner cannot exceed 50 percent of the branch-circuit rating. An example would be that an air conditioner with a full-load current of 10 amperes or less may be installed on a 20-ampere branch circuit that supplies other loads, and the receptacle that supplies power to the air conditioner should be rated for 20-amperes.

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