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This is how my subpanel looks like. I am looking to install a breaker for an AC unit. 20A. The only caveat is that this has to be 240V. This is a subpanel coming from the main one. There is a breaker of 60A of capacity so I think it should be alright from the load sense, assuming that it supports drawing 240V from it. Any information or pointers are appreciated.

Thankssubpanel pic

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    How hard would it be to replace this micro-panel with an appropriately sized panel (say, 18 space)? This panel is way too small, and that's the #1 panel mistake we see around here. – Harper Aug 16 at 4:04
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    What loads are connected to this subpanel already? Also, where does that conduit coming out the left go to, and is this actually mounted outside? – ThreePhaseEel Aug 16 at 4:28
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The feeder wire has a black, a red, a white, and a green so this suggests there are both legs present, i.e., 240 V is present.

There appears to be a double space on the right open for a 2-pole breaker. A 60 A feeder breaker should support the addition of a 2-pole 20 A load depending on the actual loads on the other circuits in this sub-panel.

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    There is not a double space on the left, just a single space...this is a 6-space panel with 5 spaces filled :/ – ThreePhaseEel Aug 17 at 18:23
  • What about on the right? – Jim Stewart Aug 17 at 18:29
  • Err, my error, I meant on the right -- there are no spaces open on the left – ThreePhaseEel Aug 17 at 18:34
  • If the OP wanted to install a 20 A 2-pole breaker for the a/c, could he remove one of the 1-pole breakers and shift the remaining to the left? If there were two 120 V circuits that didn't have big loads on them, he could combine the circuits and power them by a single breaker. – Jim Stewart Aug 17 at 18:35
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    Perhaps, but I have bigger questions about what's going on here, which is why I want info about the loads this subpanel feeds (if you look at the 15A 2pole breaker, you'll notice there's only one hot wire connected to it...) – ThreePhaseEel Aug 17 at 18:37

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