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… © By: Dave Rongey

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Electrical Code for Room Air Conditioners
[ad#block]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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Please Note:
Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects:

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.

Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.

Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.

Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.

Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.