enter image description hereToday I was in my attic checking out a ventilation issue (which I may post a separate question about). While up there, I noticed this strange electrical box mounted next to the light in the attic. There is low-voltage wire connected to it, running somewhere else. I'm unable to trace it back to it's source due to insulation in the attic. What is this? Please see all pictures at the link below.



It's a transformer (converts from normal household voltage to low voltage.)

Turn off power to that light (i.e. find the breaker that shuts it off) and then try to ring the doorbell.

Certainly that wire appears to be the normal doorbell wire, and doorbells are a very normal thing to be fed off such a transformer.

  • 1
    Glad you figured yours out. I have also seen these used for HVAC controls, such as powering a thermostat to open louvers or turn on a fan in the attic. – Upnorth Dec 10 '17 at 6:18

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.