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willing 发表于 2012-6-26 11:05 " ^4 X/ x' Y! ^* w5 m
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 ... 6 L' _: z7 v+ o8 A G0 j4 m
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。。。( B, f- s7 L3 p: s7 o& m
SELV和ELV的区别也不止这点,或者说不是这么理解。。2 _+ D, n7 `/ W4 _
When safety extra-low voltage is obtained from the supply mains, it is to be through a2 w% j& M( }& Z) \- m, {& i
safety isolating transformer or a convertor with separate windings, the insulation of which
9 ^( o9 G% o8 G$ R& ]1 Ncomplies with double insulation or reinforced insulation requirements.
1 A6 w% L5 n3 G# r* x$ zELV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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