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willing 发表于 2012-6-26 11:05 2 S0 a5 _/ u: m# h$ N- r+ T
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 ...
) t$ Q" r$ \( ^$ \3 oSELV定义下面还有一段话的,没有绝缘要求把这个S要往哪放。。。& n! y8 ~* T K7 @$ k
SELV和ELV的区别也不止这点,或者说不是这么理解。。- e$ L, Y7 Y) a2 ]
When safety extra-low voltage is obtained from the supply mains, it is to be through a' z- v! m! ?3 Z$ t) |( ^
safety isolating transformer or a convertor with separate windings, the insulation of which
( @# \* v, z+ Z' P* F& ncomplies with double insulation or reinforced insulation requirements.5 ?+ ~( S1 S+ v
ELV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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