Japan electrical

In my very humble opinion, this is a question to be asked on a Chinese Engineering Forum. I doubt that there is anything that requires 100Vac only (and God knows how I wish that I was wrong) that it is manufactured in these U.S of A. Designed? Oh, yes, but not manufactured.

As for the of the shelf power supplies, they have a wide range of input voltages, covering Japan (100V) to the glorious old England (240V I was told). By extension, any electronic equipment will be OK in any outlet around the world.

Well, the snide remark would be if you want to sell to the Japanese, the Manual should be in Japanese, and not Icelandic.

Seriously, every country (well, most every country) follows a set of Electrical Codes and standards. This means that anything sold in that country must comply with those requirements. If Japanese Codes specify 100 Volts then that's what must be supplied. Forget the 10%. The devices you export to Japan must bear labels that say "Supply Volts - 100 V" or equivalent, and they must be approved by an agency acceptable to the Japanese authorities.

Japan has different voltages.They also have 3phase 200V and 3 ph 220V in some areas.As far as the question is concerned if u want the equipment to be accepted label it 100V as required though it may work on 120 and 90 V as well.