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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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  • 0
    I just love thread drift. ?


    Surgical diathermy - high frequency, but also depends upon current density. So with the old-fashioned monopolar kit, you had a ground electrode (for want of a better word) which was the size of a paperback book, usually on the thigh so no burning there. By contrast, the surgeon's instrument passed all the current through a narrow spot and thereby cooked the tissues as required.


    I don't know about Mike's "hot bacon", but you would certainly know about it if you got your fingers in the way. ?
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  • 0
    I just love thread drift. ?


    Surgical diathermy - high frequency, but also depends upon current density. So with the old-fashioned monopolar kit, you had a ground electrode (for want of a better word) which was the size of a paperback book, usually on the thigh so no burning there. By contrast, the surgeon's instrument passed all the current through a narrow spot and thereby cooked the tissues as required.


    I don't know about Mike's "hot bacon", but you would certainly know about it if you got your fingers in the way. ?
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