There are split-phase premises supplies and three-phase. Split-phase is used for residences and small businesses, and three phase is used for larger businesses and some larger multi-tenant buildings. When using two of three phases, they’re 120 degrees apart and the nominal voltage is 208 volts. When using both sides of split-phase, the two are 180 degrees apart and the nominal voltage is 240 volts. The nominal voltage from one phase to neutral is 120 volts.
These were obviously mistakes. I would never intentionally come into contact with HT from the anode cap.
Not at all. One lumberjack pushes while the other pulls, and they’re both pushing and pulling against the ground. It’s fits perfectly.
Creating a PCB heat bed isn’t an art – it’s a science. There are equations and variables to calculate, possibly some empirical measurements by measuring the resistance of a trace, but Ohm’s Law is a law for a reason. If you do things right, you can make a PCB heat bed perfectly suited for the task. You can even design in safety features like overcurrent protection and fuses. It can’t be that hard. After all, your house is full of devices that are plugged into the wall.
The best tip for buying a portable home generator: Don’t wait until the lights go out. Whether you live in a place at the mercy of snowstorms, hurricanes, heat waves or an outdated electric grid, a power outage can range from an annoyance to life-threatening.
For a TRIAC I bend the middle pin forward 0.1″ – 0.2″, this is often done commercially and you can even buy them pre-bent.
24v 12a is not that much more at 288watts. I’m sure I’m missing something to do with electromagnetism which makes the secondary unnatractive?
Or the other takeaway is that only some piece of esoteric surplus made several decades ago is the right thing for the job and then one can go have a philosophical crisis about whether at this point we’re just plundering the ruins of a failed civilisation or not. 
You neglected to mention the Geiger-Muller counter and the Anthrax detector. Nothing short of criminal negligence to work without either one.
There are lots of AC coils out there – in my parts bins I have AC driven relays, and AC solenoid valves. How do they work?
For this application I would have used a contactor from a reputable supplier that breaks the connection on both legs of the 220V circuit vs a cheap ebay SSR.https://en.wikipedia.org/wiki/Contactor
With the primaries wired together, the magnets are epoxy potted, the business end is faced off cleanly, and the whole thing put to the test. [MakeItExtreme] doesn’t go into control details in the video below, but the website mentions the magnet being powered off a 24V 15A power supply with battery backup in case of mains failure.
Heavy Lift Electromagnet from Microwave Oven Transformers | 25 Amp Circuit Breaker Related Video:
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