Adding a 2 port valve and a dual thermostat to a Y plan heating system when an unvented hot water cylinder is used. Generally only used when installing an unvented cylinder to an existing Y plan system. For new installations, S plan is a far better choice.
The purpose of the additional high limit thermostat and 2 port valve is to physically prevent the flow of hot water to the cylinder in the event of other failures, such as the cylinder thermostat sticking on.
Overview of a smaller UK domestic electrical installation, covering who owns which piece of equipment and what each item is for.
Who to call if the meter and cutout need relocating, and why never to attempt moving them yourself.
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https://www.youtube.com/watch?v=-wEQntl54Bs
Electrical theory, practical demonstrations, experiments, test equipment, dangerous items and more.
Over 400 videos so far, and new videos every week.
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Two old MK dimmer switches from the 1970s. These have a separate switch and dimmer control, with both fixed and dimmed outputs.
Dimmer rated 500W, switches 5A. Switches are separate from the dimming part.
Internal components:
Variable resistor 4.5k to 490k
Fixed resistors 47k and 120k
Capacitors 2x 100nF, 1x 10nf
Q4006LT Diac/Triac
Ferrite core inductor.
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https://www.youtube.com/watch?v=3mQ4ruL8igw
Part 9 in a series on building a CNC router.
This episode covers drilling holes in the base of the machine for threaded inserts, using the machine itself to do the drilling.
Program created with Fusion 360.
Fusion 360 video here: https://youtu.be/LRR3VMV8LGo
Inserts are type D, M6 x 20mm.
Inserts were installed with a powered driver, and wood glue was applied to the holes before installation.
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Wiring for a PIR, microwave or photocell with an override facility, so that the lights can be off, automatically controlled or permanently on. Two different methods, using two switches or a single centre-off switch.
These methods result in a single cable at the light, and a single cable at the sensor, for easier installation with fittings that have very little space inside.
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A PC still in use in 2014, which was assembled in 2004, and runs software from 1993.
This is part of a larger system of equipment, and automatically runs a specific piece of software when started. This software has been disabled for this demonstration by holding down the Shift key during startup.
Windows 3.11, 1993.
Via C3 Ezra 800MHz processor.
128MB RAM, most of which isn't needed and can't be used anyway.
160GB hard drive with a single 512MB partition on it, and only about 35MB of that partition is used.
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Momentary switches with 24V incandescent lamps inside are converted to LED. This significantly reduces the current requirements for the illumination.
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Capacitors for electric motors, how to identify and two ways to test them.
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Fluke 117 multimeter: http://amzn.to/2orzt1u
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A steel junction box from 1958 which was typically used for lighting circuits, with a single cable to each point all joined at a central location.
This one was removed intact from an installation and still contains the original rubber insulated cables.
Made by Hartley Electromotives Limited, this example is a Type B and dated 19 March 1958.
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