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I have a 30amp 240v line running to my central A/C unit. And I want to install an 20 amp 120v outlet next to it to run an air compressor unit. Is this possible and how is done?

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No. The National Electrical Code does not allow line to neutral loads on a 240 volt line.

Besides that the line to the air conditioner will not have a neutral for the 120 volt line anyway. If you cheat and use the equipment ground that is another very dangerous code violation.

Just run a new wire. It is not worth you and your family's safety to save a few dollars.

Good luck and stay safe!

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