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Dimmers and humming Circuit Breakers



A couple of people have said they've had dimmers make their CB's hum. So what could be the cause and resolution, other than don't use dimmers?


F
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  • Lol..That was a very clear diagram Graham....

    I had a similar problem with a client who chose mismatched lighting with the control gear.

    All to do with the difference between leading edge and trailling edge mains current switching in the dimmer circuitry. affecting the LED control circuits or drivers.

    Leading edge causes unreliable results and lots of noise (hum) althought it may work with some drivers. Trailing edge control behaves more consistent with the use of LED lighting.

    Note. some dimmers will require a minimum load to work. that means more LEDs but then you'll have large start up currents.

    I suggest you seek advice from the appropriate manufacturers.

    Legh
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  • Lol..That was a very clear diagram Graham....

    I had a similar problem with a client who chose mismatched lighting with the control gear.

    All to do with the difference between leading edge and trailling edge mains current switching in the dimmer circuitry. affecting the LED control circuits or drivers.

    Leading edge causes unreliable results and lots of noise (hum) althought it may work with some drivers. Trailing edge control behaves more consistent with the use of LED lighting.

    Note. some dimmers will require a minimum load to work. that means more LEDs but then you'll have large start up currents.

    I suggest you seek advice from the appropriate manufacturers.

    Legh
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