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I did a few studies and determined out that now no longer most effective does Japan use 100V, their wall plugs are versions of the NEMA widespread and numerous them are ungrounded. Here withinside the US, ungrounded retailers are illegal in homes built after 1960 due to the threat of the equipment being grounded thru you, which may be deadly. Yet in Japan, they may be very commonplace, with grounding most effective being encouraged particularly these days. Does each wall outlet in Japan have an keeping apart transformer or is each equipment a Class II double insulated apparatus?