Hi I have got a problem with dimmer switches. I was installing two in an apt in the bathroom. The lights were low voltage halogen i think. When i changed switch to the dimmers and tryed to dim them they dimmed alright but they was a very loud humming from the fuseboard. I looked at fuse board and there appeared to be what looked like a contactor or MCB with a light on it. I have never seen anything like this before. What could this be. It wasnt a normal MCB buy was about same size. It definetly controlled the bathroom lights as when i tripped the switch it turned off the lights.
Thanks in advance for advice
Thanks in advance for advice