[quote=“TheLostSwede”]So if I can measure 2x 110V, then I’m on 3-phase?
As I tried with a multimeter earlier and it seemed like I could measure 110V from each of the two slots so to say.
I guess you can’t use most standard 220V appliances with this kind of socket then?
My landlord said it was for ovens, but since there’s no space for an oven in the kitchen…[/quote]
A lot of kitchens have grounded 110V sockets on a separate circuit. This is done for safety because many kitchen appliances draw a large load. Very few kitchens would have a 220V outlet. A 220V split-phase outlet for a cooker would usually be hardwired, i.e. no socket.
You can get 220V power from single phase (i.e. the UK), split phase (most houses in the US or Taiwan) or 3 phase (industrial consumers).
To work out whether you have single, split or 3-phase power you have to take 3 measurements:
- one hot terminal to ground
- the other hot terminal (‘neutral’) to ground
- one hot terminal to the other hot terminal
If the sum of 1 and 2 is about 15% higher than 3 then you have 3-phase (very unlikely in a domestic house). If the sum of 1 and 2 is a bit less than 3 then you have split phase. Although it doesn’t really matter for most domestic users whether you have split or 3-phase - just what the voltage is across both terminals.
But please - whatever you think of Taiwanese electricians, they still know more about electricity than a non-electrician. It is worth paying one a few hundred NT$ to come and check this stuff for you because poking probes into live sockets is dangerous and can make bits of the meter internals or even outside body electrically live.