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

  • 4
    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. Aug 16 '19 at 4:04
  • 2
    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? Aug 16 '19 at 4:28

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.

  • 1
    There is not a double space on the left, just a single space...this is a 6-space panel with 5 spaces filled :/ Aug 17 '19 at 18:23
  • What about on the right? Aug 17 '19 at 18:29
  • Err, my error, I meant on the right -- there are no spaces open on the left Aug 17 '19 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. Aug 17 '19 at 18:35
  • 1
    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...) Aug 17 '19 at 18:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.