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willing 发表于 2012-6-26 11:05 $ l* d# B: m8 l" |; [4 ?
我认为单SELV的电路本身是没有绝缘要求的, 因为SELV已明确规定其供应电压小于42V, 且根据8.1.4, SELV供电的 ... # V3 c3 Q; a* l* o6 @7 z
SELV定义下面还有一段话的,没有绝缘要求把这个S要往哪放。。。
+ l, e# w, W0 {" ~+ W/ E! b- Z v# CSELV和ELV的区别也不止这点,或者说不是这么理解。。" J |, }% Y+ y2 Z7 q/ `! a# x
When safety extra-low voltage is obtained from the supply mains, it is to be through a2 a6 k8 o: z5 B- W8 y' Z$ G3 ]# ~
safety isolating transformer or a convertor with separate windings, the insulation of which1 ?' Q* ^- f% C( G- x
complies with double insulation or reinforced insulation requirements.
Z) ^ k* K2 {5 U- S* CELV是没有绝缘要求的,只要电压不超过50V,SEVL一定要双重或加强绝缘 |
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