Wierd one....

Makes me wonder if it wouldn't be better to earth the secondary and effectively make it FELV?

or if the source still gives "SELV" standard separation from the LV live conductors, it should still qualify as PELV.

I suspect poor quality LED drivers that are allowing significant leakage or capacitive coupling between one side of the mains input and the presumably metal frames of the LED modules.

I wonder where the capacitive coupling is? Is if just between the LV and ELV sides of the PSU - in which case is the frame of the fitting deliberately connected to one of the ELV lines? Or is it capacitive coupling between the LED array etc and the ceiling grid?


I've got my doubts about being able to get a decent bonding effect to a ceiling grid that made up of dozens of separate bits of metal, often painted and just clipped together - I'm wondering it it might be more effective to connect each fitting's metal frame (presuming it has one) to the c.p.c. directly - trapping the problem at source as it were.



Now I think about it some of the LED bulkheads I've used (the type with a strip of LEDs around the inside of a circular heatsink) - has the ELV side metalwork connected to the supply earth terminal - I thought it odd at the time as there seemed to be plenty of separation from the LV side and the driver looked to be SELV - but maybe now I'm starting to understand!


   - Andy.

Makes me wonder if it wouldn't be better to earth the secondary and effectively make it FELV?

or if the source still gives "SELV" standard separation from the LV live conductors, it should still qualify as PELV.

I suspect poor quality LED drivers that are allowing significant leakage or capacitive coupling between one side of the mains input and the presumably metal frames of the LED modules.

I wonder where the capacitive coupling is? Is if just between the LV and ELV sides of the PSU - in which case is the frame of the fitting deliberately connected to one of the ELV lines? Or is it capacitive coupling between the LED array etc and the ceiling grid?


I've got my doubts about being able to get a decent bonding effect to a ceiling grid that made up of dozens of separate bits of metal, often painted and just clipped together - I'm wondering it it might be more effective to connect each fitting's metal frame (presuming it has one) to the c.p.c. directly - trapping the problem at source as it were.



Now I think about it some of the LED bulkheads I've used (the type with a strip of LEDs around the inside of a circular heatsink) - has the ELV side metalwork connected to the supply earth terminal - I thought it odd at the time as there seemed to be plenty of separation from the LV side and the driver looked to be SELV - but maybe now I'm starting to understand!


   - Andy.