Heavy Lift Electromagnet from Microwave Oven Transformers | 19mm Momentary Push Button

I use a contactor with my sonoff, 1kw pool pump. The sonoff is seriously under specced for switching a pool motor.

This is a heater that’s going to be near fingers, or elbows, and is completely accessible to them, completely easy to touch. One day, when he’s distracted thinking about something else (not rare), he’ll end up touching the heater and getting a shock.

I’ve used 220V heaters to cook meat and I survived (quite well fed) up until now. I suppose heating a piece of plastic can’t be that much more difficult, although wh

Maybe what should be done is a special 240 outlet be developed and installed in all new construction (1 per garage). Something with safety features like thermal monitoring built into outlet. This would probably cost less than all those annoying ARC fault breakers I am required to have…

They make silicone pad heaters for automotive stuff like someone else mentioned, that would probably work too.

Sure I expect my line voltages to vary especially given that the actual spec for my line voltage (UK) is 230V +10%/-6% – my nominal voltage where I’m sitting is around 242V and I’ve seen it go as high as 252 and as low as 220.

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So here follows the first in a series on how to approach electronic devices containing high voltages, and live to tell the tale. By “high voltages” we mean anything up to mains voltages, and those directly derived from them such as the few hundred volts rectified DC you’ll find in a switch-mode PSU. For multi-kilovolt EHT you’ll have to wait for another article, because that is an entire subject in itself. We’ll mention these higher voltages in passing, but their detail is best left for a Hackaday colleague with more pertinent experience.

Storage and battery. The Sony Alpha A33 offers a single flash memory card slot, but it’s compatible with two memory card standards, each with various permutations. The first is Memory Stick PRO Duo / PRO-HG Duo, Sony’s own proprietary media format. As an alternative for those who prefer more standardized media, Sony also supports three flavors of Secure Digital cards — standard SD, SDHC, and SDXC.

Yeah just what we need – another dopey ‘standard’. Putting stuff in right and using proper equipment is and has always been the solution.

BTW, one can’t just put in a big red button and call it Emergency Isolation Switch. At least in an industrial setting a Emergency Stop follows strict guidelines which include possible damage to the machine from using it. There are rules and regulations for how these are wired, where they are placed, etc. One doesn’t just run mains power through it. Typically these are low voltage switches that cut power to coils of high current contactors and relays.

Then when you step up a notch to the KV stage the safety rules change because air can now be a conductor.