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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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    Reminds me of when whilst at sea and passing close to land, off Cape Town or Singapore Straits come to mind, I could get good mobile phone coverage both for voice and data.  Problem on one ship was that from my cabin, I needed kneel on my bed with my head up to the window glass to avoid loosing the signal - after all I lived in a large steel can... Besides often being able to "feel" the GSM signal just above my ears, I found that if I phoned whilst still connected to the charger, I was getting a tingle from the external aerial socket which was on the rear of my Ericsson GH688; my other hand being on the steel window frame.  From memory that too was about 110 volts between socket and steelwork. Swapping the polarity of the plug made no difference, which with no neutral due the sockets being across two phases of a 3-phase 230v supply, was no surprise. I cured both by purchasing a car mobile phone aerial with a magnetic base. Saved twisting my knee as well!

    Clive
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  • 0
    Reminds me of when whilst at sea and passing close to land, off Cape Town or Singapore Straits come to mind, I could get good mobile phone coverage both for voice and data.  Problem on one ship was that from my cabin, I needed kneel on my bed with my head up to the window glass to avoid loosing the signal - after all I lived in a large steel can... Besides often being able to "feel" the GSM signal just above my ears, I found that if I phoned whilst still connected to the charger, I was getting a tingle from the external aerial socket which was on the rear of my Ericsson GH688; my other hand being on the steel window frame.  From memory that too was about 110 volts between socket and steelwork. Swapping the polarity of the plug made no difference, which with no neutral due the sockets being across two phases of a 3-phase 230v supply, was no surprise. I cured both by purchasing a car mobile phone aerial with a magnetic base. Saved twisting my knee as well!

    Clive
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