Discuss Leds lights & buzzing board in the UK Electrical Forum area at ElectriciansForums.net

No they didn't but why would they make the circuit board buzz
The MCB has an electromagnetic coil inside as part of the overload protection and the dimmer switch can cause harmonics into the circuit causing the mcb buzz.

Remove the dimmer, add a normal switch or join the two cables together and see what happens if the noise stops then you know its either the dimmer switch or the lamps causing the issue, I had weird issues with non dimmable lamps someone installed, they had life of their own.
 

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