Thank you sir! Very helpful! Just a minor comment: The number following the word NEMA is the "type". There is a table in Wikipedia "NEMA Connector" explaining different types. For example, the old two straight blades one (L and N) for 120V system is type 1 (NEMA 1), while the one with a Ground (L, N, and G) is NEMA 5. NEMA 6 has a similar format except that it's 240V and L, L, Ground. NEMA 14 is also for 240V system and in L, L, N, Ground format. The number behind the dash is the maximum current rating. 實用電流會稍小一些。