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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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Here’s links to a collection of our blog posts about APPLIANCES:
• What are the building code requirements for installing an appliance (furnace, air handler, water heater) in the attic?
• Which house appliances need a dedicated electrical circuit?
• Is a washing machine drain hose required to be secured at the standpipe?
• When was GFCI-protection for kitchen dishwasher receptacle outlet first required?
• Why does venting a clothes dryer into a garage, attic, or crawl space cause problems?
• Does a refrigerator water supply line require a shutoff valve behind it?
• My spa tub stopped working. What's wrong?
• What is the maximum recommended height above the floor for an above-the-range microwave?
• Why would a home have natural gas appliaces but no gas meter?
• Is a hot water faucet required at a washing machine?
• Can I remove a 240-volt range receptacle and hard-wire the range?
• Can a dishwasher be wired to a kitchen counter small appliance receptacle circuit?
• Why is it bad to have a clothes dryer vent near an air conditioning condenser (outdoor unit)?
• Do home inspectors test the appliances?
• What are the most common defects with over-the-range microwaves?
• Are a range and refrigerator required kitchen appliances for a house to pass FHA inspection?
• What are the code requirements for an outdoor dryer vent cover?
• What is the maximum length for a clothes dryer vent?
• Why are my ceiling fan blades drooping?
• How do you inspect a dryer vent?
• Why is there a water hose connected to the back of the clothes dryer?
Visit our APPLIANCES and HEATING AND AIR CONDITIONING pages for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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