For 220v outlets in the US, there are three plug types based on amperage that take the same care to ensure proper grounding. https://www.pcrichard.com/get-it-r

For 220v outlets in the US, there are three plug types based on amperage that take the same care to ensure proper grounding. https://www.pcrichard.com/get-it-right-the-first-time-a-guide-for-matching-power-outlets-plugs/Blog-6947.html https://www.pcrichard.com/get-it-right-the-first-time-a-guid... The US seems to be a little less cautious with 110v/15 amp outlets.