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Connecting appliance to live and earth

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Phil-S

Joined Dec 4, 2015
241
DickCappels said:
Within two years of completion of construction all buried electric cables (Cable TV, telephone, 240 VAC, doorbell) stopped working. And to think I actually tipped the electrician once! When the doorbell failed, the real electrician we hired had an inspiration. The connection failed because there was an intermittent connection between the two conductors.

The doorbell was wired to 240 VAC on one side (ouch!) and connected to Neutral through the bell button. His solution: Connect the button terminal that usually went to Neutral to a small grounding rod he drove into the ground near the doorbell button. Imagine the torment those earthworms experienced when the button was pressed. He was otherwise a good electrician. I eventually had another electrician run conduit out to the button, giving those earthworms a break.

My ground fault interrupter breakers trip at about 15 ma. That's painful enough.
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240-V AC door bell? Doesn't bear thinking about. You might just get away with it if it were an industrial double insulated IP68 plastic switch.
Some electrician who thinks it's OK to use the earth in the first place, but I hope at least he/she put in in a pit for good measure.
I've had plenty of "belts" from RCD protected circuits and despite feeling like my arm was being wrenched off, not once has the 30-mA RCD tripped. Happy to say they all pass the installation tester.
 
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