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Old 07-12-2016, 01:20 PM   #15
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Las Vegas , Nevada
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Will a 20 amp circuit work for AC?

I get that standard 15 amp household outlets are not advised for running an AC unit, but will a 20 amp circuit work assuming the AC unit was the only device drawing current? I currently have a 20 amp circuit installed in my garage and would like to know if I can safely use this for short periods (with a short power cord properly rated) at home without having an electrician come out and install a 30 or 50 amp connection. Should I be okay in this scenario? Thanks!

PS - Living in the desert its 110+ outside. Really need the AC to get ready for trips and when returning home to unload/clean up. Thx!!

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Old 07-12-2016, 02:55 PM   #16
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Morrill , Nebraska
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It all depends on how far the 20 amp receptacle is from the power panel. Typically a 20 amp outlet is wired with #12 AWG wire. Which is good for 20 amps. But if you have a long run from the power panel (more than 30' or so) you will experience a significant voltage drop. Thus the reason for a 30 amp circuit with #10 or larger wire feeding the RV receptacle.

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Old 07-12-2016, 03:29 PM   #17
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Ditto to TGT, plus you have to consider the length and AWG size of the extension cord to the trailer. I ran our 13.5k A/C on a 20 amp circuit using a 50' #12 ext. cord, and the voltage dropped to around 109 when both the fan and compressor kicked on. The circuit breaker did not pop, but I was concerned about long term damage to the A/C.

If you are willing to risk this theoretical damage, and the breaker holds . . . your call . . .
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Old 07-12-2016, 05:00 PM   #18
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Western , ** Big Sky Country ** Montana
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Listen to TG ... how far away will you connection be / what gauge is your cord ... if not plugging your AS supplied power cord directly into your power source???
The pic shows what happened over about 15 minutes with the AC being the only device (excluding leak detector) energized in our AS FC20... the GFCI did not disconnect this circuit as there was no fault - likely in a few more minutes we would have had a total melt down of the extension cord plug.
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