Dimmer buzzing

[Marvo]

Yes buzzing at the CU isn't a good sign.

The buzzing at the Consumer Unit may be from the MCB which has an electromagnetic coil inside as part of the overload protection. It may be poor filtration in the dimmer switch causing an induced harmonic into the circuit and causing the mcb buzz.

Nice idea and could be possible but maybe a long shot. I've never encountered MCB's buzzing because of poor PF or harmonics, even in the triplen range which would cause the highest heating effects. I would check for more obvious causes first.

 

[egginyourface]

have u measured how many amps the mcb is drawing when all the lights are on?

 

[Delboy247]

It Has nothing to do what the mcb is drawing as it only happens when this dimmer is operated I will look more in to on Tuesday thanks for everyones oppinions.