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Wierd one....

tonydon
Hi everyone. 


So,  today we installed 6 new led panels in a new ceiling grid

The panels ar Ansell panels.  They are class 2. Low volt.


Then , our plumber says he has had a shock when touching the ceiling grid and a boiler at the same time.


So, we tested the ceiling grid to a local earth.   120V AC  or   -2.9V DC......   The grid  even lights a volt stick....


After trying several ideas I eventually swapped the live and neutral connections on the primary of the led drivers.......


The result..... no measurable voltage  between the grid and earth.......


The driver and the led panel are both marked class 2 ......


How is this possible??


Is it safe?


Do I need to bond the ceiling grid?
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    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 doubt that the leakage current from a single light is dangerous, but would be rather more concerned at the cumulative leakage  from several. If not directly dangerous, there would seem to some indirect risk of a shock resulting in a fall.

    I would bond the metal ceiling, at several points.

    In years gone by, I suspect that metal ceiling grids were fortuitously connected to earth by mains voltage lights, each with a CPC and inserted into the ceiling.
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  • 0
    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 doubt that the leakage current from a single light is dangerous, but would be rather more concerned at the cumulative leakage  from several. If not directly dangerous, there would seem to some indirect risk of a shock resulting in a fall.

    I would bond the metal ceiling, at several points.

    In years gone by, I suspect that metal ceiling grids were fortuitously connected to earth by mains voltage lights, each with a CPC and inserted into the ceiling.
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