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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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A weird thing with an electrical screwdriver
I was mystified by something I experienced today. I'm sure any electrician will know the answer. Sorry if its a naive question. I was using one of those electrical screwdrivers with abuilt-in diode for identifying live wires. I wanted to disconnect a security light on my house but I wasn't sure which circuit it was connected to. I concluded the light was wired into the lighting circuit, because it failed to come on after I pulled the main fuse from that circuit. But just to play safe, I touched the screwdriver onto the terminals in the junction box which the light was connected to. The diode didn't light up. However, when I touched the brass end of the screwdriver's handle, it lit up, quite brightly. So I found my volt meter and tested the wires to see if there was any voltage there. No voltage registered. Can anyone explain why the diode lit up when I touched the brass end? And it lit up the same, whether I touched the screwdriver onto the live, the neutral or the earth terminal. Regards, Drake |
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