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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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    The fact you get -2.8 whichever way round your probes are could be because what your meter is seeing is some sort of high frequency noise which rather than it being proper DC it's confusing your meter. I bet if you held an AM radio near the lights you would hear all sorts of noise  from them
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  • 0
    The fact you get -2.8 whichever way round your probes are could be because what your meter is seeing is some sort of high frequency noise which rather than it being proper DC it's confusing your meter. I bet if you held an AM radio near the lights you would hear all sorts of noise  from them
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