Ohio will let businesses pay their taxes with Bitcoin | 19mm Momentary Push Button

You are right, of course. I should have used “shock” instead of “electrocution”. English is my secondary language…

This seems to me that your experiment failed due to thermal failure cased by insufficient cooling and not the part itself..You stated yourself that the part failed due to thermal expansion (insufficient cooling). But it’s still a valid experiment with valid results. And you show that it’s up to the designer (or designers) to design the entire product, which includes sufficient cooling. This is one area where home designs fail – a lot.

I work with high voltage all day everyday except for weekends, and then I’m probably doing some wiring or something at my house. 480VAC is on the low end of the voltage scale for what I do. The biggest and most important safety tip is: “Know thy equipment.”. That means knowing where the 480VAC is coming in, everything it powers, where that voltage gets stepped up to thousands of volts, what chassis and assemblies are floating at high voltage, at what point of the turn on sequence they are at high voltage, knowing what to use a chicken stick on when things are powered down (i.e. the high voltage bits – BUT NEVER AC MAINS!!!). I’ve seen the ends of chicken sticks where the unknowing tried to short 480VAC to ground… thank el diablo for fast acting circuit breakers… If you do not know what the hell you are doing or think suiting up in some silly bomb suit and silly gloves that are going to get you killed faster with than without, you need to stay the hell away from anything over 28 volts…. You cannot troubleshoot everything with LOTO, you sure as hell can’t troubleshoot with big stupid gloves and a bomb suit on. Those things were invented by desk jockeys who have never had to work on anything themselves in their lives. Great for theory, terrible for getting shit done. Knowledge is the only thing that will keep you safe. Stupidity and trusting others to keep you safe will kill you.

So a 20 amp breaker is designed to take the load shift on startup. A 15 amp breaker will carry the nominal load, but that surge on startup will kick it every time. In the days before switching supplies the input voltage would vary from 108 to 115VAC where I did work. This occasionally caused breaker trips on the unprepared circuit. I learned to spec high enough to minimize that issue and keep a safety factor in play.

AC may have “won”, but now we need to upgrade to 400 Hz! (smaller transformers, less eddy losses) B^)

And don’t trust the 15KV gloves you pick up a Dayton Hamvention for $20. There’s a reason they’re so cheap, unless you certify them they’re just as bad as having nothing at all due to unknown defects and misplaced trust.

There are notable advances in interior quality and function, most significantly with the dash getting a complete overhaul that includes better materials, layout and an eight-inch screen operated by buttons and touch as standard. It’s both smart and reasonably intuitive, albeit slightly short of some of the slickness of VW’s various systems. As is common in the class, Toyota has expertly put the best materials where you are most likely to see and touch them, with hard, basic plastics mostly hidden in corners of the car.

Evil Triacs, should be banned by Law anywhere in the World. How is looking a dimmer with Relays? I will love to see a picture. Or an evening filmed youtube video with it, the contact sparks are a free added effect, nice one

A few people made some useful design suggestions. I like the Power Integrations LNK switch suggestion for power. I’d also recommend looking at the SR086, which does the same thing — but it’s inductorless! That’s the chip I’m using for my ESP8266-based WiFi dimmer.

Most people here only deal with low voltages – domestic mains and below. Where I live even mains voltage is lethal.

Where Madrid, Spain Price from £28,000 (est) On sale Feb 2019 Engine 4 cyls, 1987cc, petrol plus electric motors Power 178bhp @6000rpm Torque 140lb ft @ 6000rpm Kerb weight 1410kg (est) Top speed tbc 0-62mph 7.9sec (est) Economy 74.3mpg (est) CO2 86g/km (NEDC est) Rivals VW Golf, Ford Focus

Opto-isolated TRIAC is fine and dandy, but there is no fuse, so if you overload it, you have a cooking TRIAC in your junction box …