this post was submitted on 15 Jun 2024
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[โ€“] [email protected] 1 points 5 months ago* (last edited 5 months ago) (1 children)

Japan is just 100V, not 110/115/120, there are some appliances that will use 200V. Similar to how the US has 240V. The weird bit with Japan uses both 50 and 60hz.

[โ€“] [email protected] 1 points 5 months ago

Right. That was the thing. They're 50/60hz based on location. I know something was different but I misremembered.

For the US, they use 240v split phase. The secondary on the transformers have a middle tap, called neutral, so if you go from line to line, you get 240v, if you go from either line to neutral, you get 115/120v approximately. The benefit to it is that you can use two 120v devices in series, one connected to line 1, the other on line 2 and the neutral connections simply connected together. Total load voltage is 240v.

But appliances that use a lot of current like clothes dryers, air conditioners/heat pumps, water heaters, and ovens, can be connected to 240v directly.

It creates some interesting opportunities and challenges.