Japan is a funny place, voltage-wise, in that it uses a 100/200VAC local distrbution system, 100VAC is the
single phase voltage and 200VAC is the 3-Phase Star based system.
Let me quote this:
Frequency is either 50Hz (east Japan including Tokyo, Sendai and Sapporo)
or 60Hz (west Japan including Nagoya, Osaka, Takamatsu, Hiroshima, Fukuoka, Naha),
depending on power companies.
# For home appliances
: Single-phase 3-wire,
100V (using live and neutral wires) / 200V (using live and live wires).
: Most home appliances are designed only for 100V.
# For factory uses
: 3-phase 3-wire, 200V.
So we have 3 phase, 3 wire, which suggests Delta?
Or it could be 2 phases plus a neutral at 180° wired as Star.
What sort of equipment is this?
Does it matter if the frequency of the supply is 50 or 60 Hz?
I look forward to your reply.