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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), 3 L/ j/ ~+ m* r2 ^) }, Q( a) q, f
I 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 Z0 m" V7 X/ [1 T, p
Controlgear with an integrated SPD requiring connection to earth shall be marked with the) j. ]5 g/ Q, I$ [) W8 y! h4 a9 K
protective earth symbol according to IEC 60417-5019: 2006-08.# ~) a/ X( z! E- M- Y5 l! P
5 _' {' Q% F/ R& m' Y6 d" h60598-1 中class II 中的定义 Note,也说这情况是存在的7 O$ T. d0 T9 ~0 i. w( u8 |; k
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
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