A simple plug-in socket tester which uses three neon lamps to indicate the status of the socket terminals.
This example is about 20 years old, but similar items can still be purchased new.
Although these do work, they can only provide very limited information, and certain types of faults will not be detected such as N&E reverse, or where the earth impedance is too high to ensure disconnection times are met. If a fault or wiring error causes two pins in a socket outlet to be live, the result displayed on this tester will be totally wrong and misleading.
Overview of different methods of testing earth electrodes to ensure their impedance is low enough.
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https://www.youtube.com/watch?v=G9CjydiUkAI
Some very large Federal Electric circuit breakers, from an even larger 3 phase distribution board.
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https://www.youtube.com/watch?v=mi2NEVRQgFM
The unearthed water heater is heated to failure.
Previous episode: https://youtu.be/CE1DSysm_EU
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https://www.youtube.com/watch?v=ahiy5FOH9Hs
Part 3 covers supplementary equipotential bonding and the most common location it is required - bathrooms.
Earthing part 1 : https://youtu.be/odnUIWyC0oU
Main bonding part 2: https://youtu.be/a5JOTA-mJ4A
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https://www.youtube.com/watch?v=CVxBettQpPU
A white plastic switch which isn't what it looks like.
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https://www.youtube.com/watch?v=HuRcq_CWBas
A low cost mains powered LED nightlight is opened to see what is inside, and how the circuit of almost no components actually works.
Part 2: http://youtu.be/huPvdFKaJSM
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https://www.youtube.com/watch?v=8hlqBIwLbuw
A dangerous and non-compliant mains adaptor plug supplied with an electrical item which had a Chinese type mains plug fitted to it.
The problems are all due to the adaptor supplied - there is nothing wrong with the moulded on Chinese plug, other than it being unsuitable for use in the UK.
The proper thing to do is to supply the UK plug already fitted, or with a fitted semi-permanent fused adaptor such as the comparison example shown in the video. This is not just a personal preference - it's the law, and has been for almost 20 years.
http://www.legislation.gov.uk/uksi/1994/1768/made
Problems with the adaptor:
Pins are not sleeved
Pins are too close to the edge of the adaptor
There is no fuse
Pin spacing is incorrect, probably due to the flexible plastic not securing them properly
The 2 pin plug does not fit properly into the adaptor and will easily fall out.
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https://www.youtube.com/watch?v=jUu8a6MP0iI
Unboxing a Megger MFT1741 multifunction tester.
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https://www.youtube.com/watch?v=4yHVVc32Pd8
Old electricity service cutout with two 30A rewireable ceramic fuses.
Made from cast iron, painted green.
UK DNOs: http://www.energynetworks.org/info/faqs/electricity-distribution-map.html
Website with pictures: http://xo4.uk/?KKd
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https://www.youtube.com/watch?v=KLhFpyc10DA