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首先确定, I 类灯具 和 I类结构是不同概念,一类灯具是要把metal enclosure 接到 保护接地terminals 上(定义),
: S0 T. h; _5 lI 类 结构说个例子,驱动,全部是塑料外壳,有保护接地terminal 接到SPD,没有接到塑料外壳上,这种情况是可能的
3 f7 G5 K. w2 [! r% f7 EControlgear with an integrated SPD requiring connection to earth shall be marked with the
& {8 G# n) f' O) R8 z' Rprotective earth symbol according to IEC 60417-5019: 2006-08., A, N& X) X' v- I& A
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60598-1 中class II 中的定义 Note,也说这情况是存在的) M* `0 ~, c, h4 P% a5 M Q' n
Note 4 to entry: If a luminaire with double insulation and/or reinforced insulation throughout has a protective earthing terminal or a protective earthing contact, it is class I construction, K* r) X6 y1 a5 l8 B
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