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LED driver earth leakage

vantech

Hi,

I have a situation where LED panel lights appear to have a voltage of roughy 80V between the metalwork of the panel and the containment overhead (which is bonded to earth). 

The LED driver is double insulated, and SELV and a plastic case and remote from the panel. It does stipulate in the user manual that the driver does have earth leakage, but how does this happen when it has no earth conductor, and it’s output is SELV? Is it leaking through the panel despite the fact it’s technically isolated?

The cable between the driver and the panel light is a DC connection, plus and minus, with the panel light also being a class 2 product. 


Ideas? 


Thanks. 

Parents
  • 0

    When you measure the 80-volt, is the fixture installed in the ceiling grid?

  • 0 in reply to AMK

    Yes indeed! Could well be even with the lights completely removed from the grid, a voltage is present between the grid and the containment.

    Once had a severe dig when my ear brushed the metal bars of a suspended ceiling grid at the same time as my hand made contact with the metal trunking in the void above. Fell off the step ladders as a result and pulled a fair section of the ceiling down with me. All in front of of a storey full of bemused office workers!

  • 0 in reply to lyledunn

    That seems like a severe shock! I have seen a similar incident involving a plumber. Perhaps van tech is measuring the total leakage currents from other class 1 devices that are in contact with the grid, and the LED panel with its isolated metal frame is in contact with the grid when he conducted the measurements.

  • 0 in reply to AMK

    Hi, 

    The panel lights are class 2, so in theory the LEDs inside should be isolated from the frame unless they are leaking through this via induction? 

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