type    Plug standard   Voltage (V) Allowable current (A)   Grounding electrode polarity    fuse
A       NEMA 1-15   no polarity     125       15    None    None    None
        NEMA 1-15   with polarity   125       15    None    Yes None
        JIS C 8303  Class II        100       15    None    None    None
B       NEMA 5-15                   125       15    Yes Yes None
        NEMA 5-20                   125       20    Yes Yes None
        JIS C 8303  Class I         100       15    Yes Yes None