Microsoft and Razer are working on Xbox keyboard and mouse support | 220v Contactor Relay

The operation of the potential relay is based on the increase in back-electro-motive force (back-EMF) or a bucking voltage that is generated across the start winding as the motor increases in speed. The large metal mass of the motor’s rotor turning at high speeds with motor windings in close proximity has a voltage-generating effect.

I do not recommend diy 120/240 volt AC in this application. While you are correct that the higher voltage allows lower current draw, you are not proposing limiting the current, which can be very dangerous. If your hands were wet with sweat, you would act as a lower resistance path to any available ground you might be touching. In much the same way a hot dog will cook with 120 AC poet applied to each end, you will do considerable damage to your skin, muscle, and fat tissues along the current path. Use DC power, a larger wire, and maintain the safety margin. One trip to the ER will buy many hundreds of meters of wire and plenty of DC power supplies. Oh, and by the way, I’m an electrical engineer.

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.

Not really clear but good point. I met an electrician who told me : ‘230VAC is not dangerous, I’m getting shocked a lot, it really hurts when its 400VAC. Oh by the way, I have to get an appointment for my heart !’

Michael Ashbaugh writes technical analysis for MarketWatch and is editor of MarketWatch’s "The Technical Indicator" newsletter.

We drive about 30k miles/year, lots of long trips. After a trip, we usually pull in with 25-50 miles of range remaining. No problem – charging to the normal 80% is < 7 hours.

idk, anytime I’ve been shocked on the job I tend to immediately pull back – usually any screwdriver I have in my hands goes flying, and hopefully its not towards me or anyone else’s face. Which is why I use all 1000v insulated screwdrivers now. Better sorry than safe, kill two stones with one bird. You can definitely “feel” the alternating current.

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

Evil picture, don’t coil your cord tightly around the EVSE, it should hang loosely to dissipate heat

I am glad, that finally someone posts this, because this is also my information about dangers of electricity. I just have not been sure enough, if I had missed something. I also heard, that a DC accident can kill you hours later even if you are not burnt that heavily, because DC is able to cause electrolysis in your body which upsets the delicate balance of electrolytes in your blood and tissue.

And even today people give the advice of plugging a computer in the wall and grabbing the metal case as you’re working inside it. Bad idea – if the PSU has failed, you may very well have live voltages in the boards.

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