power fed light switch Hager rcbo won’t trip

[Alan46967A]

Power fed light switch and all lights test great, as soon as we put the dimmer switches in the Hager rcbo won’t trip, any ideas please

 

[nicebutdim]

What type of RCBO and can you provide some information about the dimmer?

 

[Alan46967A]

Hager ADA 306g 6amp rcbo the 4 gang dimmer are for led lights

 

[nicebutdim]

Nothing obvious stands out to my mind, although my knowledge is less than comprehensive.

 

[cireland]

Are you sure it was tripping before installation of dimmers? Sorry, have to ask.
Could also be coincidence it has chosen this point in time to break.

 

[UNG]

How are you testing the RCBO trip

 

[Alan46967A]

Are you sure it was tripping before installation of dimmers? Sorry, have to ask.
Could also be coincidence it has chosen this point in time to break.

Hi
Yes from each light fitting and again after taking dimmers out

 

[Jimbo_McSparkface]

Just a thought, I worked for a long time as a spark and AV engineer in the entertainment industry and some of the dimmers for LED stage lighting in that sector that I came across had fully isolated outputs. I haven't come across that in a domestic install personally though, but could it be????

 

[DarrenVWF]

depends what part of the cycle you are testing.
some dimmers are leading edge and some are trailing edge.
have you tried testing RCD on both positive and negative cycles?
most hager RCBO will trip within 1 cycle (20ms) regardless of testing at 0deg or 180deg.

 

[Alan46967A]

depends what part of the cycle you are testing.
some dimmers are leading edge and some are trailing edge.
have you tried testing RCD on both positive and negative cycles?
most hager RCBO will trip within 1 cycle (20ms) regardless of testing at 0deg or 180deg.

Yes have tested on both cycles.

 

[freddo]

Wait, are you connecting your RCD test meter to the output side of the dimmer? I'm surprised the meter isn't complaining about the rough supply.

 

[Electro-tech]

Are you testing it as an AC setting on MFT, as an A-type test, some testers do not have a variable test current to test correctly?
What tester are you using? Is any DC earth leakage present which may influence the result?