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willing 发表于 2012-6-26 11:05 - L. H2 C( `/ y% ] a( U, L$ b
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 ... % p/ _0 H$ E$ P: N7 ]0 Z9 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。。。) }% l5 F. W7 z$ m0 v! z6 t
SELV和ELV的区别也不止这点,或者说不是这么理解。。
# ~/ N/ n' k( e: }6 o8 t% A: N6 CWhen safety extra-low voltage is obtained from the supply mains, it is to be through a
' g* q: j, z0 g7 B9 vsafety isolating transformer or a convertor with separate windings, the insulation of which+ r- {8 _) J8 R2 z# `# p
complies with double insulation or reinforced insulation requirements.
. z* M% Y0 ^& s: n" C6 l% P) ^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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