six-point socket II said:
I have an OT question: If you have a 230V circuit/panel wired professionally in the US, it has two wires considered hot and a ground wire, right? That's were typically 230V household appliances are plugged in, correct?
2 Hots, a Neutral and a Ground. The Neutral and ground our Bonded together at 1 point in the system (typically the main panel). For 110V supplies you have a hot and the neutral. Since the neutral is bonded to the ground, it has 0VAC but carries full current the same as the 2 hots, ground is 0VAC 0amps. On the 220V circuits, the neutral is unused. But ground is still there, the circuit is using 2 of the 110V lines that our out of phase to get the 220V. Works out the same as pure 230V systems were one side is referenced to ground. Thus why we can plug stuff from Europe directly in. Unless something has a real problem with 60hz vs 50hz, but most stuff you find is 200-240VAC 50/60Hz.
Generally everything is color coded. The Hots are Black and Red, Neutral White, ground is Copper or Green. Use the same wiring for both 110 and 220, but when you wire up a 220V circuit, you typical wrap the white wire in red tape to help make clear it's 220V. We also have dual voltage circuits, these have 220 and 110, so all 4 wires to the same plug. These are common for items like dryers that might have 220V heaters, but controls/motor might be 110V. These plugs are now common for welders, EV chargers, etc. In some places they are now required in new construction in garages. They are also handy as you can install one, and then later use them as a place to install a small sub-panel and have 220/110V circuits. Wire in the US for residential wiring is NM-B, comes most often in 12-2, 14-2 or 12-3, 14-3 (the later number is the number of power conductors, so you have either a black and white or a black, white, red. Both have a ground. If you are building a garage/shop, you typical wire it up with a mix of 110V and 220V plugs, plus some 220/110V plugs to cover all the bases.
Big saws, welders, air compressors, etc are typically 220V here, and course lots of hardwired in stuff is 220V. Which is why in the end, tools being 220V really isn't an issue. Only if you are doing a lot of work within the finish space of a house could it become a challenge, and that is where you would go looking for the dryer plug as it's going to the easiest to access 220plug,