Electrical – How to tell if a breaker uses both phases/legs

electricalelectrical-panel

Good day.

I hooked up Sense monitor by adding a 240v breaker to my panel (bottom 2 slots on one leg). Problem is Sense has detected that my breaker is sitting on two slots that occupy the same phase/leg of the panel.

How can I tell of there is 2 slots in the electrical panel that will occupy both phase/legs so that Sense will work properly? From reading I suspect Sense monitor power needs to be connected to both phases/legs.

Panel:

  • Stab-lok CAT NO. BE 116-32
  • MAINS 125 AMP.MAX.
  • 120/240 VOLTS A.C.
  • 1 Phase 3 Wire
  • Y24-863A

enter image description here

enter image description here

Best Answer

Stab-Lok is a PROBLEM

See, for example, What can I do about a breaker that trips frequently on a Stab-Lok panel?

So first read up on Stab-Lok, post a picture of your panel (the pros will recognize it and tell you if it really is a fire hazard, etc.) and determine if this is a concern. If it is a real concern, then dealing with replacement is a much higher priority than hooking up the Sense monitor.

How it SHOULD Work

On many panels (I don't know if Stab-Lok is supposed to work this way or not), a true double (240V) breaker will always hit both legs. The exception is a double-stuff breaker, where it is really two-breakers-in-one. In that case, it normally only hits one leg, and the exception is if it can actually be 1/2 of one leg and 1/2 of the other leg. But that, as I understand it, is only on certain panels where you can have a quad == 4 in one, but really 4 in 2 - i.e., a double-space breaker that has 4 individual breakers, two on one leg, two on the other leg, with the result that the inner breakers can function together as a "double 240V breaker".

FIRST FIGURE OUT THE STAB-LOK!