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Yeah really though. It’s kind of embarrassing. I’m an engineer and work in big industry (usually minerals, bulk material handling, oil and gas, doing a big robotics project right now for a wood products plant, etc.) and this would be an afterthought. No one would even question it. I mean really a no brainer. People use electric blankets on their bed. I really don’t get it. It really shows how amateur hour most of the people who comment on this site are.

Um, Though I live in Oz where we have 240 volt mains, I can see a big error in how it is explained. On, you get two different “phases” on th 110v side of things to increase the measured voltage.

Getting reasonably priced SSRs that are trustworthy seems almost impossible. A 40A TRIAC costs $34. I know there’s more than the TRIAC in the SSR, but it’s not like there are that many components either… I end up using relays if at all reasonable and scratch my head when they’re not…

Although a mains powered heated bed sounds scary for a hobbyist-built 3D printer, there are a number of positives to the design. It would heat up faster, thin down a few parts, and significantly reduce the overall cost of the printer by not requiring another 100 Watts delivered from a 12V power supply. It’s a great idea if it doesn’t burn down the house. Anyone want to help?

I do not disagree that this is not the best way to do it. I have only used it for temporary installation, and only when I can frequently inspect everything involved for signs of elevated temperature. At home, I had a licensed electrician install a NEMA 6-50 and a 40A circuit (which we de-rate to 32A for EVSE service) in our garage for our car charging needs.

It does seem to be an old electrician’s habit, never leaving the leads plugged into amps. Somebody commented on one of Big Clive’s videos about him doing that. Seems like a good habit to get into.

As 220 + 10% is just 242 volts, and the EU standard is 230 +/- 20 volts. So 250 volts is within the standard, and should be expected. And then we have Australia that has 240 to 250 volts.

After a long, bitter, loud argument with the plant “electrician” I finally got him to check the distribution board, when we opened up the “big grey box” first thing I saw was all the earths, bundled together with tape and just hanging there. From where I was standing I saw a fuel tanker driver hooking the earth lead to his truck, which came into the same box.

If you’re buying electricty at 15 cents per kWh, then it’ll cost you .15 * 10.5 = $1.58 to fully charge the Niro’s battery, which will propel the car 26 miles, at which point the gasoline engine kicks in, which gets 46 mpg.

But at the same time, if one wants a high efficiency power supply, then the manufacturer typically have placed in a rectifier that is technically over specified for the job, as these devices are generally not that expensive, and are an easy way to cut down a few watts overall without adding any substantial extra cost.

In my experience, the more people know about electricity, the more cautious they are. And the more they have to deal with dangerous voltages, the more cautious they are. With few exceptions, most Youtubers you see doing dangerous stuff online have no idea what they are doing. Speak to a decent electrician and you’ll see they work more safely than most engineers and thousand time safer than amateurs. We don’t really need electrical cowboys showing off how dangerous the stuff they do is.