"We have a ballast that's buzzing!"


Senior Member
Call from a local bank, about a troffer ballast buzzing. So I picked up a replacement ballast on the way over, and went in to what I thought was an easy service call.

Yeah, I could hear a buzzing sound. But it wasn't coming from the troffer. It took me a few minutes to trace it down.... to a remote ballast for a 100w MH fixture above the ceiling.

I never realized remote ballasts had a little light in them to indicate when they're buzzing!