Cooker circuits for domestic properties. Protective device, cable size, and what can be connected to the end of it.
In virtually all cases, a 32A MCB and 4mm² cable is suitable for cooking devices up to 15kW.
For connecting to the appliance(s), either 4mm² or 2.5mm² H07RN-F flex depending on the connected load.
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Why RCDs trip when faults between neutral and earth occur, and why switching off a circuit breaker / MCB is not isolating the circuit properly.
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Cheap plastic Fresnel lenses and what they can be used for.
These can be obtained from ebay and similar places and are found by searching for 'fresnel card'.
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https://www.youtube.com/watch?v=FdINpAlUcsM
The EL wire panels are installed and working.
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https://www.youtube.com/watch?v=4I_J4qL00VQ
Old voltage operated earth trip from the 1930s or 1940s.
Made by GEC, this device disconnects the supply when a voltage appears on the earth connection for an installation. They were used on installations which have a high impedance earth (usually due to an earth electrode as the only earth) to ensure disconnection when earth faults occurred.
Devices like this are no longer used, and have not been permitted in the UK since the early 1980s.
This one does not work properly, as the trip mechanism has either jammed or failed in some other way.
The book shown in the video is 'GEC Everything Electrical', dated September 1935.
Webpage with more pictures of this device: http://xo4.uk/?kWz
Crabtree version: http://youtu.be/0s7Wqivg0lw
Ottermill Chilton: http://youtu.be/mbller272pc
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https://www.youtube.com/watch?v=2yquvqto-pk
Replacing panel mounted MK sockets in a metal extension reel.
Sockets are MK 735WHI, and are the same size as those made decades ago. There is an ancient data sheet for the original ones here: https://docs.rs-online.com/739a/0900766b811ef79c.pdf which is dated July 1959.
Flex is 2.5mm² 3 core PVC. This is significantly larger than most extension reels available today which are typically 1.5mm² or even smaller. This can be used at full load while wound up, as the larger cable has a lower resistance, so a lot less heat is generated in it .
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Loop impedance, why it matters and typical values expected for smaller installations (100A or less).
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A look at some Prysmian FP200 Gold cable including what happens when flames are applied to it. This example is 2 core, 1.5mm².
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