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参考灯具类UL标准(比如UL153, UL962等),都明确要求screwshell端接地脚,即插头大边接螺纹金属,请不要误导大家.( b8 r3 x+ _5 h" l8 L$ v
4 j) r* e8 a/ C"The screwshell or screwshell contact of each Edison-base lampholder shall be connected to the grounded supply conductor of the supply cord."4 q& L6 F/ ~( S' u# M8 i