Crabtree wooden fusebox with two rows of five ceramic fuses.
Painted in a dark brown, this has 'War Finish' stamped inside. The brown paint would have been used rather than the more usual varnish, as the paint would have been cheaper and quicker to apply, reducing cost and the time to manufacture it.
The ceramic fuses have sprung contacts, with the fuse wire almost totally enclosed within the ceramic.
Double pole fusing was not permitted after 1955, as a fault could cause only the neutral fuse to blow, leaving equipment non-working but still in a dangerous condition. ... https://www.youtube.com/watch?v=Sg65ErRB7mY
Replacing a traditional separate timer/programmer and room thermostat with an all-in-one controller such as Hive or Nest. Applicable to 2 channel systems with a hot water cylinder and radiators.
Old room thermostat is removed and a link installed in it's place, the new controller box replaces the existing programmer/timer.
This is part of a series on central heating wiring, full playlist of videos here: https://www.youtube.com/watch?v=mYwm7SmslyM&list=PLVsHvs2Suqmr5HtxgbInR4bXmH0kLseWc
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https://www.youtube.com/watch?v=tFT1AJsbMfo
Loop impedance, why it matters and typical values expected for smaller installations (100A or less).
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https://www.youtube.com/watch?v=HsWWKzjVUxE
A power cord sent in by Scott from Canada. A low cost item made in China, this is very poor quality with numerous problems.
The lead is examined and eventually totally destroyed by overheating.
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https://www.youtube.com/watch?v=Aq8_XYTZbGM
Clamp meters, how they work and how to use them.
Includes a modern example by Fluke, and two older ones by Sangamo Weston and Ferranti.
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Retro style pendant set, with chrome E27 lampholder, yellow fabric covered twisted flex and a chrome ceiling rose.
Looks nice - but it's a fail.
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New edition of the On Site Guide, companion book to BS7671.
Errata: https://electrical.theiet.org/bs-7671/updates/
Page 125, Table B6.
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https://www.youtube.com/watch?v=6IjRxKIcrNo
A defective 12V power supply is opened, examined and repaired.
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https://www.youtube.com/watch?v=5f6OUcT7ugo
Wylex fuseboxes with rewireable or cartridge fuses are very common in older properties. Plug in MCBs can be obtained for these, and are simple to install.
However doing so is a waste of money, since the MCB does not offer any additional protection compared with a fuse.
Both devices disconnect the power in the event of an overload or short circuit.
The only advantage of the MCB is that is is quicker to reset - but fuses should fail almost never, and if fuses require replacement often, there is some other problem which no replacement device will fix.
New consumer units will contain one or more RCDs, which will disconnect the power in the event of an earth fault, such as someone touching a live wire.
It is impossible to fit these into old fuseboxes like this.
It would be possible to add an RCD separately before such a fusebox, and there are some installations where this has been done. However adding an RCD in this way does not comply with BS7671, as in the event of a fault on any of the circuits, the entire installation will be disconnected and will remain that way until the fault is located and repaired.
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https://www.youtube.com/watch?v=VTXnSgpiCSw