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Electrical Wire and Cable

How to Electrical for an Air Conditioner

By Dave Rongey - Summary:

Why Most Air Conditioning Units Should Not Be Plugged Into a Shared Circuit

Installing an Air Conditioning Circuit

Electrical Question: I live in an older apartment building, would guess from the 40s. We have 2 screw in circuits – a 20amp and a 30amp. The 20amp is dedicated to the kitchen, and the 30amp is for the rest of the apartment. The only major item that would be plugged into the 30amp is a large plasma unit that takes about 5.5amps. The rest would be room lights, some fans, computer, etc. Its starting to get hot out and unfortunately our apartment is pretty bad with heat retention. I have an 8000 BTU AC set up, but its not cutting it (went through all different setups with it). I want to try a 10K AC unit. However these units get up to about 9amps. I had read that anything over 7.5amps should get its own circuit. Its not an option to install any more circuits. But shouldn’t the 30amp be able to handle the load?


This electrical question came from: John, from Caldwell, New Jersey

See more about Home Wiring for New Jersey

Dave’s Reply:
Thanks for your electrical question John



Circuit Requirements for Air Conditioners

Most Air Conditioning Units Should Not Be Plugged Into a Shared Circuit


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The size of the home electrical service panel is designed by calculating the square footage of the home and factoring in the code requirements for the electrical circuits that are required.

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