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willing 发表于 2012-6-26 11:05 0 r( r/ |* T3 u3 }3 n; z
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 ...
; l [2 a8 m4 {1 ~ w) _! e* qSELV定义下面还有一段话的,没有绝缘要求把这个S要往哪放。。。& Z s/ s, P8 B: o+ q9 e) l. W
SELV和ELV的区别也不止这点,或者说不是这么理解。。
1 P' L9 d, A3 L% F$ R5 UWhen safety extra-low voltage is obtained from the supply mains, it is to be through a
/ c+ }* K! U+ h m# Xsafety isolating transformer or a convertor with separate windings, the insulation of which3 l$ g. U7 ]! T/ O8 y
complies with double insulation or reinforced insulation requirements.
' @% v9 L! \1 ]/ t# z$ YELV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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