Yes, the Samsung Galaxy S9 has a headphone jack | 220v Contactor Relay

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.

It’s probably worth at this point explaining for a minute how earthing works with respect to mains power. You will have a local earth connection at your house, and your utility company will connect the neutral line to an earth at the substation to ensure that line voltages are not induced at a higher voltage with respect to their surroundings than the voltage they are supposed to carry. There may be 110V or 230V between the live and the neutral depending where you live, but without that earth connection both of those conductors could end up at thousands of volts higher than their surroundings, for example in a thunderstorm. The earth connection provides a fixed relationship between line voltage and the surroundings, such as the utility poles, trees, your house, and you.

No, Britlish, which is some modern bastard concoction. It’s well known that we in the colonies (American, that is) speak English that’s closer to the “original” than what the British warp the air with.

I’ve been using a relay to switch a 1000W pump. http://telecnatron.com/articles/ESP8266-WIFI-Remote-Controlled-Mains-Switch/index.html

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The third incident was also while I was working for the welding repair company. I had a previously perfectly working high-pot tester and needed to test the insulation on a transformer. The tester itself failed and shorted to the case – and I took 11kv AC to the fingers just by turning the power on. That stung a bit, but I got a new high-pot out of the deal, so a net positive.

On an MV distribution there is no neutral or ground wire, just the three phases with a delta / star transformer to make the LV.

If you do not know the exact value of each cost, you could enter an estimated percentage based on the cost of goods.

You can get special ground fault detection switches. The circuit at the output of the isolation transformer should be floating with respect to ground. When they detect an impedance between that circuit and ground below some configurable threshold (sometime 5Mohm) they will switch off the power.

I’m not going to argue with your statement, it just seems funny to me that someone would tens of thousands on an Electric Car but still be using a Gas lawnmower!:)

For a TRIAC I bend the middle pin forward 0.1″ – 0.2″, this is often done commercially and you can even buy them pre-bent.

Very nice. It’s similar to my Toast-R-Reflow power board (though that one has two channels and uses BTA-20s).