Heavy Lift Electromagnet from Microwave Oven Transformers | 25 Amp Circuit Breaker

Would that we solved with two opto’s per button, one to read and one to press ? Ignoring the LED feature entirely. Because you cannot assign a pin to be both input and output.

Can you please tell me the minimum creepage and clearances between the low voltage and mains side by your standards? How have you done the measurements and decided is not enough? I’m more than happy to hear the story. Ans also again…did you hear about conformal coating and what’s for?

I’ve been bit in a big way only three times. Two of the three were “Trust but don’t verify” issues, and I learned from them – always verify, no matter what anyone says.

In air conditioning, we are given a gift by equipment manufacturers on the equipment data tags: the minimum circuit ampacity (MCA) and MOCP or max fuse/max circuit breaker rating.

I would like to add that it’s not just electricity you need to worry about. There could be other energy sources present from things like air, springs, hydraulic, etc that could pose a safety risk when you remove the electricity.

2. At the 1.8V voltage drop Mattias Wandel mentioned in the video, his SSR was dissipating about 40 Watts of energy and the metal bast plate he mounted the SSR to was not sufficient for dissipating 40 Watts of heat energy.

Have to be ohnest I would never ever consider a SSR for such an application even if it was a genuine unit form a reputable supplier. this is a perfect example where a relay should be used, tried, tested and ought to fail somewhat gracefully if it came to it. Not snarking at the OP, but any situation I have used an SSR its been massively over-specced for the load im driving, i dont think I could sleep well at night with an SSR controlling tens of amps at hundreds of volts.

One of Sony’s nifty tricks is their in-camera "sweep panorama" technology. The A33 and A55 let you shoot panoramas with the camera held either vertically or horizontally. The vertical orientation makes taller/narrower panoramas that are 5,536 x 2,160 pixels, as seen in the top photo above. With the camera held in landscape orientation, panoramas are 8,192 x 1,856 pixels.

You likely encountered a shared neutral between more than one circuit. You have to switch off the breakers for all the circuits that share the neutral.

You may be confusing voltage drop ALONG a power line with the voltage BETWEEN lines. Maximizing the latter will transmit same power with less current, minimizing the first and hence Ohm’s Law power loss through transmission.

You like many others here can wallow in their own baseless opinions, meanwhile millions including myself very safely charge up using 120 volts almost every night. I usually use a higher voltage for the BOLT, but the ELR mostly just charges on 120 the same as most VOLTS.

*My* electricity is cheap (~$0.065/kW), so that 117 miles would cost about $7.61. Gas in my area is down to about $2.70/gallon, so the total fuel cost for those 253 miles would be about $16. Other areas of the country might be higher for electricity and lower for gas.