Editing AC power plugs and sockets (section)

==== JIS C 8303, Class II unearthed<span class="anchor" id="Japan"></span> ====
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File:OutletPlug.jpg|Japanese Class&nbsp;II polarized sockets with earth post, for a washing machine (similar to NEMA&nbsp;1-15)
File:Japanese air conditioner electrical outlet.jpg|Japanese 20&nbsp;A socket with earth post and earth connector, for an air conditioner (similar to NEMA&nbsp;5-20)
File:Japanese air conditioner electrical outlet 200v.jpg|Japanese 200&nbsp;V socket with earth slot, for an air conditioner  (similar to NEMA&nbsp;6-20)
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The Japanese Class II plug and socket appear physically identical to NEMA&nbsp;1-15 and also carries 15&nbsp;A. The relevant [[Japanese Industrial Standards]], JIS&nbsp;C&nbsp;8303,<ref name= JIS>{{Citation |title=JIS C 8303-1993, Plugs and Receptacles for Domestic and Similar General Use |publisher=Japanese Standards Association |year=1993}}</ref> imposes stricter dimensional requirements for the plug housing, different marking requirements, and mandatory testing and [[type approval]].

Older Japanese sockets and multi-plug adaptors are unpolarised—the slots in the sockets are the same size—and will accept only unpolarised plugs. Japanese plugs generally fit into most North American sockets without modification, but polarised North American plugs may require adaptors or replacement non-polarised plugs to connect to older Japanese sockets. In Japan the voltage is 100&nbsp;V, and the frequency is either 50&nbsp;Hz (Eastern Japan: Tokyo, Yokohama, Tohoku, Kawasaki, Sapporo, Sendai and Hokkaido) or 60&nbsp;Hz (Western Japan: Osaka, Kyoto, Nagoya, Shikoku, Kyushu and Hiroshima) depending on whether the customer is located on the Osaka or Tokyo grid.<ref>{{cite web |url=https://www.worldstandards.eu/electricity/plug-voltage-by-country/japan/ |title=Power plug, socket & mains voltage in Japan |website=WorldStandards.eu |year=2024 |access-date=6 December 2024}}</ref> Therefore, some North American devices which can be physically plugged into Japanese sockets may not function properly.