I'm attempting to map out our home electrical breaker panel. The labels written by the electrician 20+ years ago aren't super helpful, so I've having a go making things a bit clearer.

I have several breakers just labeled "Split". No description other than that. Each one is two 15 amp breakers "linked" (bridged?) together. What I mean by linked is that there is a piece connecting both of them so they have to be flipped at the same time.

I have three sets of these, which would make a total of 90 amps. Quite a bit considering the house only has 250 amp service.

Any ideas what these "Splits" are? The only other place on the panel with large "links" are for the big appliances (stove, dryer, air conditioner).

Thanks.