I just bought a house and there are two transformers in the garage. I'm trying to figure out what they do. The house was built in 2014 and located in San Mateo, California.
I suspect one of them is for the doorbell (since there must be a doorbell transformer somewhere). I'm guessing it's the one with two cables (one for the button and one for the chime).
I have no idea what the other one (the one with yellow tape) is for. What I do know is that it is hot, so it must be powering something. (The blue one is slightly warm, but definitely not hot.) Any idea what this could be for? It's not for the alarm system (I already identified the alarm system's transformer) and I don't think it's for the furnace, since it is not nearby.
I'm also not sure how to disconnect either of these transformers. At first I thought it was an ordinary outlet/plug. I pulled and it didn't come out. Then I noticed that it can twist. What kind of connection is this? and how do I "unplug" them?
I'm going to try disconnecting the wires to see what stops working. But I need to turn it off first via the circuit breaker. How do I verify that it has been disconnected since there is no direct indication that it is or is not connected?
UPDATE: I got a multimeter. The one with yellow tape and 3 cables is 14.7VAC and the blue one with 2 cables is 20.2VAC. I identified the correct breaker, but it also took out the lighting in the garage…