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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

    Could it be your digital voltage indicators picking up stray voltages between isolated metal class 2 and earth bonded containment. Digital voltage indicators have a high input impedance,makes them sensitive to stray voltages, which can result in false readings.

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  • 0

    Could it be your digital voltage indicators picking up stray voltages between isolated metal class 2 and earth bonded containment. Digital voltage indicators have a high input impedance,makes them sensitive to stray voltages, which can result in false readings.

Children
  • 0 in reply to AMK

    It might be worth repeating the measurement with a multimeter (such as a Fluke 114) that has a low input impedance voltage measurment range.

    Most multimeters have in AC voltage input impedance of about 5 MΩ which will cause the problem that AMK describes above.

    The low input impedance range on the Fluke 114 is only about 3 kΩ and solves most problems of this nature.

    No connection with Fluke, other than a user of their instruments.

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