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25 things to do before Aug. 25 – Edinboro University News Detail | 220v Contactor Relay

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The place to start when talking about mains-voltage equipment is your bench. We realise you’ll probably be working at your kitchen table or wherever you happen to be, but it’s best to start an article like this with a baseline, of what you really should have when doing this stuff. There are three things we’d consider essential in the mains power system on a mains-voltage bench. An isolation transformer to power the item you are working on if it needs a mains supply, a residual current circuit breaker for the rest of your mains supplies, and an emergency isolation switch for all bench power.

I recently spent 2 days troubleshooting my main PC because it was shutting down under even normal load, let alone trying to mine cryptocurrency. (I mine on my daily-driver hardware, not investing in a dedicated rig)

The point is it can be done safely and cheaply and is proven to be safe; so we can’t work out why everyone was so dubious.

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To me, this is like the equivalent of cheating on your math homework by looking for the answers at the back of your textbook. Or worse, like getting a hand-me-down copy of Where’s Waldo and when you open the book, you find that your older cousin has already circled the Waldos in red marker. It’s about the journey, not the destination — the process of methodically scanning pages with your eyes is entirely lost! But of course, no one is actually going to use this robot to take the fun out of Where’s Waldo, it’s just a demonstration of what AutoML can do. Reed listed a few more possible applications: “Maybe a fun use would be seeing what cartoon character the AI thinks you look closest to? Maybe could detect comic book forgeries?”

Power outlets in homes—but not businesses and other buildings—are required to have tamper-resistant receptacles, which prevent kids from getting hurt when sticking objects in the slot. At first glance, the tamper-resistant receptacles don’t look different from the ones without the safety feature, so read the label closely if you need to buy a new one. They’re a little more expensive, but I’ll send you back for another if you don’t shell out the extra money up front.

#PreferLinux mentioned switching off at the mains socket. Do that, but still test; that saved me once when the switch was faulty. Yes, that socket was replaced, pronto!

Historically, there were two post-war electric utilities, and one contracted with GE for equipment, and the other contracted with Siemens – thus the two wound up with different frequencies.

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It would require a molded socket attached to an edge with a standard IEC polarized C7 connector. No exposed conductors anywhere. Could embed a green light for powered up and a red one for hot into the socket molding.

Ive had a few shocks off 220vac but nothing that hospitalized me. But I do distinctly remember a shock recieved by a friend. He had a illegal cb with a zetagi 1kw valve linear amp, it tended to carbon up its changeover contacts and loose quality on ssb so I showed him how to turn it off, isolate it, drain it down and clean them up with contact cleaner. And I kept repeatedly stressing, dont do this without doing the whole isolation things as it will kill otherwise. Well, one day it went bad in the middle of a qso, and this was to some prized russian area, so throwing caution to the wind, he sprays contact cleaner at the relay while mid conversation, while holding a aluminium microphone in other end to talk it up. You guessed it, the valve hv field collapsed into the stream of contact cleaner, threw him across the room and into a wall and his glasses were blown off and twisted by the event. His girlfriend took him to hospital and it took a fortnight before they were happy with his vital signs to declare him fit to leave. All I could say when I visited him was “I bloody told you so” but his girlfriend was up for blaming me “for showing him”, and since then I’ve shied away from showing people things that if they ignore some of my warnings could kill them.

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It would work, you could try just one winding on its own to start with but beware the voltage surge you get when disconnecting the current, as a minimum it should make a nice spark, even with a small battery driving it, at its worst it is shocking(!) I think the reason for winding your own coils is to get the optimum ampere turns for a chosen voltage, if you use what the transformer comes with you will have to work out what voltage gets you the highest magnetic strength without burning out the winding.


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