Is my appliance compatible with the Amazon Smart Plug? | Lrd12 Overload Relay

I forgot to say that 220 volt AC is effectively 310 volts peak, so therefor one could instead use 300 volts DC instead, giving roughly 25% less current to carry in the wires to get the same power in the end.

No edit, so addendum: glancing at comments below, one thing to note: go take apart a toaster and examine the safeties in place there. That may give you some insight into commercial (safety certified, most likely) implementation of a similar technology in the consumer market.

The best defense is to make sure you buy from reputable sources, not from some backyard hardware store or eBay.

Anything below 50 Volts is considered “safe”. As in, you don’t need to be a licensed electrician to build and operate it. That’s the other thing with dealing with mains voltages in a DIY project. If you build it yourself, your insurance company won’t covery you.

– Use isolated differential probes to measure high voltage. – Use current clamps or current transformers to measure current. – Put bleeding resistors in any big capacitor in your circuit. – Don’t change the position of the probes in the power circuit without power everything down. – Don’t work with high voltages alone. – If there’s more people involved in your experiment, block any circuit breaker, button or at least put some signs to prevent people from turning them on while you are messing with the circuit. Paranoids may even ground things while they are playing with the installation to direct the current to the ground in case someone makes a mistake.

Oversizing switching gear is good to some point but instead of relay withstanding surges I would prefer breaker that would protect everything.

You can use mains voltage if it involves already approved/CE-licensed parts that are simply wired together such as a power supply to a circuit board, but if you design and build your own part with 120 V inside, it’s on your head when the house burns down.

Some adjustment necessary. This shot turned out well at -0.3 EV, but a lot of my shots under bright conditions could really have used -0.7 EV of adjustment.

Once upon a time, must have been 13 or 14 at the time, was doing the annual find the blown bulb in the christmas tree lights. Must have completed said mission and marvelled how the bit of cable at the middle/end of the lights was hidden within insulation tape (lights must have been 20 or so years old, this was in the 90s) and the curious being that I am thought let’s see what the tapes hiding – obviously bare wires.

Specs-wise, the Mi Mix 3 moves the series to OLED with a 6.4-inch 1080p panel. There are four cameras in total: 12-megapixel wide-angle and telephoto modules on the back, and a 24-megapixel selfie camera backed by a 2-megapixel sensor on the front. The phone has a fingerprint sensor on the back, so unlike the Oppo Find X you don’t have to pop the cameras up every time you want to unlock it.

1) the frequency (50-60 Hz) tends to make muscles spasm repeatedly (DC spasms and stays there) 2) the frequency can interfere with cardiac electrochemical signalling (your heart goes into fibrillation) 3) the current can pass through capacitance (shielding) and via inductance 4) the current can pass through ground return and other single-wire, open circuit States

Flake has said he won’t back any judicial nominees until he sees a floor vote on legislation that protects special counsel Robert Mueller and his investigation into Russian election interference.