はじめてのUK③ Not single phase 3 wires 240/120volts system.

# Sorry to use poor English m(__)m This is a practice.

In almost all Japanese residence, single phase 100/200 volts distribution system is used.
Household apparatuses in Japan operate under 100 volts, but single phase 200 volts can be also used for IH cooking heaters etc. Use of three phase 200 volts apparatuses (for example air condithioners like as in offices and factories) is banned in residences, because babies or olders can be electrically shocked with 200 volts.

On the other side, in Europe, we do not see 100 volts class household apparatuses, but 200 volts class.
In this hotel 240 volts are used.
Every tap has three contacts like below.


239 volts

When I had read books about European travel that told us as "You need a transformer that changes voltage from 200 volts class to 100volts", I thought "it may be similar in Japan, single phase three lines 240/120 (in Japan 200/100) volts system. The voltage between two lines are 240 volts. Between a line and the earth conductor may be 120 volts."
I measured them actually.

That is incorrect! (>_<)
Between L1 and the earth is 240 volts.
Between L2 (probably not L2, but the neutral conductor) and the earth is 0 volt normally.
If we touched L1, we have a electric shock with 240 volts. It's dangerous.
I apologize and correct it.
Subibasen. m(__)m
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