This is well worth watching
Bonding and Earthing and hidden faults ( bond wires LIVE )
- Thread starter bernardgreen
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It is interesting, and it points out although could not be demonstrated with just 12 volt, how important the NCV on the meter is.
shown here in use with a very similar meter to shown in the video. The meter buzzes and shows zero to 4 bars depending on how much voltage is detected. There are other tools
to do the same which we see loads of people telling others even on this forum should be put in the bin. They however have a very real safety feature, can't be demonstrated with 12 volt, but these tools can alert one of problems.
I am not saying they can replace other tools, we all know how to prove dead, main point is tester has no on/off switch or battery, and is tested before and after with a proving unit. However the proving unit clearly needs to use 50 volt AC as well as the full 400 volt, as one could have a tester which the neon or LED will only light with the higher voltages.
I have only once been required to use a proving unit, at rock savage on a plant making fridge gases where one was sacked if you did not have proving unit to hand, I will admit I take a chance that my clamp meter is working as it should, but seen many an electrician without a clamp meter.
shown here in use with a very similar meter to shown in the video. The meter buzzes and shows zero to 4 bars depending on how much voltage is detected. There are other tools to do the same which we see loads of people telling others even on this forum should be put in the bin. They however have a very real safety feature, can't be demonstrated with 12 volt, but these tools can alert one of problems.I am not saying they can replace other tools, we all know how to prove dead, main point is tester has no on/off switch or battery, and is tested before and after with a proving unit. However the proving unit clearly needs to use 50 volt AC as well as the full 400 volt, as one could have a tester which the neon or LED will only light with the higher voltages.
I have only once been required to use a proving unit, at rock savage on a plant making fridge gases where one was sacked if you did not have proving unit to hand, I will admit I take a chance that my clamp meter is working as it should, but seen many an electrician without a clamp meter.
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