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# Lights Dim When AC Comes On

Category Electrical

The lights in my bedroom are dimming when the AC kicks on and while it is running. They are on the same circuit breaker. Do I need to change all of the breakers?

By Beverly J.

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July 3, 20110 found this helpful

Your air conditioner should be on a dedicated circuit. Meaning the air conditioner should have a wire from the circuit breaker to the air conditioner outlet. Nothing else on the curcuit.

July 3, 20110 found this helpful

Your air conditioner should be on a dedicated circuit. Meaning the air conditioner should have a wire from the circuit breaker to the air conditioner outlet. Nothing else on the curcuit.

July 3, 20110 found this helpful

If you can't use a dedicated circuit try this. See how many amps it's rated for. Amps are listed on the AC vin plate or usually on the back side someplace. Use the 80% rule. Example : Lets say it's 6 amps, convert that to watts 6 x 120 volts = 720 watts for the AC. Add that to the watts of everything else on the same circuit. So lets say your using 200 watts total plus the 750 watts for the AC totaling 950 watts. A 20 amp breaker will support 2400 watts. 80% of 2400 is 1920 watts total. Keep the load under 1920 watts on a 20 amp breaker and you should be OK. The dimming comes from the power surge of the compressor when it kicks in on the AC. A slight dimming for a moment is not a big issue if you don't over load the circuit and your electrical is ( in good standing.) New breakers won't fix the dimming but if you want to be extra safe replace the one for the AC and keep the old one for a spare. This way it will have a better chance of tripping ( OFF ) if something does go wrong. Since the AC is shared with lights it seems probable that it's a 120 volt AC and not 240 volt. Use the 80% rule for all your electrical needs thru out the home and educate others in the home on this stuff as well. Doing this much and you will be living in a safer haven and it didn't cost you dime to do it.