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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 …
80%? When dealing with high current loads I top at 70% to allow for wobble of line voltage. For something like a Water heater I’d drop that to 50% ratings to make sure the surge doesn’t cause failure.
Toasters kindof have to use mains voltage, there’s a kilowatt or so of power in there. They do their best to keep the mains voltage away from hands, you’d have to deliberately put your fingers in to get shocked. Always remember to switch off at the wall before you stick the knife in to dig out your crumpets!
Later while an engineering student I worked in a factory where they built video projection systems with a 30kV final anode voltage
Fast AF. Phase-detect AF doesn’t hunt like contrast-detect, making for fast, smooth AF during movies. (Click to download 4.9MB MP4 file.)
I would prefer, use a circuit (SCR?) to lower the voltage to around a safer value, where we won’t have any problem in the worse case.
Second was with an old (illegal) CB amp that I was converting to HF, and I touched an unshielded feed inductor of some sort, the aftermath from the RF burn was worse than that time I grabbed the wrong end of an iron with my fingers.
A mains isolation transformer. wdwd [GFDL], via Wikimedia CommonsAn isolation transformer isolates the mains supply from the earthing system. This does not change any of the risks inherent to the mains voltage or other high voltages in your device, but it does provide you with some level of protection should you accidentally provide a path to earth from a live component.
Most people here only deal with low voltages – domestic mains and below. Where I live even mains voltage is lethal.
Quite often, when I was in the Air Force as a Cable Dawg, I would get zapped while doing copper cable cut splices for mission critical systems. Meaning they were left powered and came back on one by one as they were spliced. -48v DC is very tingly when it runs through a crimper and into your arm…
It’s one of those things that “everybody knows,” sort of. For continuous duty applications (and EVSEs certainly qualify), you derate the circuit breaker by 20% unless you are using circuit breakers and wiring that are specifically rated for continuous duty.
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