Touching the surface of a lamp with bare fingers will leave oil or grease on the surface - but will this cause problems and should gloves be worn when installing lamps? For halogen capsule lamps which operate at very high temperatures, the grease can cause failure of the glass. For everything else, it makes no difference.
A failed Hager RCBO is taken apart to see what failed and why.
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https://www.youtube.com/watch?v=TRUBlZCNo8U
Testing electrical installations to confirm the circuit protective conductor (earth wire) is continuous and connected correctly.
The second method also confirms correct polarity.
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https://www.youtube.com/watch?v=AZenZfLQQgw
Problems with measuring mains voltages with an oscilloscope, the correct and safe way to do it, and other dangerous methods that must never be used.
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https://www.youtube.com/watch?v=a3ePild_sFs
Part 7 in a series on building a CNC router.
This episode covers spindle control, panel buttons, LED indicators and some of the Mach4 software configuration to make these things work.
Other videos in this series: https://www.youtube.com/playlist?list=PLVsHvs2Suqmp7di69X5mYnVeM84rij8I-
BC327 transistor datasheet: https://www.onsemi.com/pub/Collateral/BC327-D.PDF
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https://www.youtube.com/watch?v=E07-P0oafJI
Changes to BS7671 Part 1 and Part 2, comparing the 17th edition 3rd amendment (Yellow) with the new 18th edition (Blue).
New 18th edition books applicable from January 2019:
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#BS7671
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https://www.youtube.com/watch?v=pH3RByoklKY
What a neutral wire is and how it is derived at the transformer.
Also how part of a circuit is a neutral, how it isn't once disconnected and possible dangers of disconnecting wires which have apparently no voltage on them.
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Other videos on transformers and electrical systems:
Isolating transformers: https://youtu.be/sfzy5IQMzyc
Why normal supplies are not isolated: https://youtu.be/Wx_v1-T1gE4
Earth connections: https://youtu.be/fRhofcMyAyk
Many other electrical basics: https://www.youtube.com/playlist?list=PLVsHvs2SuqmohPoL8Cumvqg2DmGcrZF8R
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https://www.youtube.com/watch?v=AgCY_d98HF8
Watts vs Watt Hours
Amp Hours to Watt Hours
Power is the rate at which electricity is used, energy is the total amount used over a certain period of time.
Includes example calculations for the total energy and cost used, and the capacity of batteries.
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https://www.youtube.com/watch?v=MkENLF6hRRk
Part 2 in a series on steel conduit. This episode covers cutting conduit, forming threads on the ends, and things to consider when measuring lengths to fit between boxes.
Items in this video:
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Rocol RTD compound: https://amzn.to/2zr3yWX
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https://www.youtube.com/watch?v=-KqvTTeSt1E
Small wooden fusebox. Originally this would have contained two rows of fuses, however one row has been removed and replaced with a single terminal for the neutral wires.
Fuses and holders are ceramic, with the remains of rubber insulated wires attached. The cloth pads behind the fuses probably contain asbestos.
The plastic neutral terminal was probably fitted in the 1950s or later, as double pole fusing was discontinued around 1955.
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https://www.youtube.com/watch?v=-_vOllDpH8s