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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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    Also bear in mind that the voltages you're measuring may have high impedance sources (due to e.g. capacitive coupling). Multimeters, being very high impedance themselve, tend to register very high voltages; but as soon as you apply any sort of of load the voltage plummets. You could (for example) temporarily connect the frame to earth via a 1K resistor (approximates body resistance) and use a leakage clamp to see what sort of current you get. If low enough, repeat without the resistor.
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    Also bear in mind that the voltages you're measuring may have high impedance sources (due to e.g. capacitive coupling). Multimeters, being very high impedance themselve, tend to register very high voltages; but as soon as you apply any sort of of load the voltage plummets. You could (for example) temporarily connect the frame to earth via a 1K resistor (approximates body resistance) and use a leakage clamp to see what sort of current you get. If low enough, repeat without the resistor.
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