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本帖最后由 tsunn 于 2013-8-9 20:34 编辑 6 u; p; ?: ~; I/ ^/ F+ j0 Z- e
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各种不同的定义太累。大家有什么看法。& F7 a& x) h1 I; `+ l- l! B& f- h1 k
EN60335版本定义：6 o8 _1 h& k9 O9 P
3.4.2+ ?/ D! `" x# R; S( R" M' A1 E7 }* T* ?
safety extra-low voltage3 z% Y$ t! s/ p" O8 v) w
voltage not exceeding 42 V between conductors and between conductors and earth, the no-* M5 g+ G1 N; r+ k
load voltage not exceeding 50 V
( C _3 v0 R9 K, UWhen safety extra-low voltage is obtained from the supply mains, it is to be through a
/ }" `" Q" d9 zsafety isolating transformer or a convertor with separate windings, the insulation of which4 {1 P+ z9 ^# S9 Z: ?
complies with double insulation or reinforced insulation requirements.
- P4 O$ q# W$ L: cNOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is4 o$ K) p3 {$ r' Z
supplied at its rated voltage.
7 Q6 f. t. X6 H% [+ \NOTE 2 Safety extra-low voltage is also known as SELV.% }- N* a' f9 T% R" o: d
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6 q O. t7 s; }4 w1 PEN60598版本定义：
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SELV (safety extra low voltage)4 Y! ~) O) J& c3 W
ELV in a circuit which is insulated from the mains supply by an insulation not less than that
6 G% \: O' J1 W) l( T8 _between the primary and secondary circuits of a safety isolating transformer according to, s1 f1 @; B0 T5 n7 T
IEC 61558-2-6 or equivalent
. ^& g% a' t$ _. l$ }6 |/ I2 e/ WNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular, J, Z; ^; s3 p& f! x+ F
requirements, especially when direct contact with current-carrying parts is allowed.
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# H$ B7 ]9 C; J* F1 b0 `, f1 s7 p我在网上下载了一个不知道哪个机构翻译的UL8750中文版，里面居然有SELV定义,看图（但我在英文版（2009）里没发现该定义。在UL8750里其实叫做LVLE）: m6 o4 x$ r/ g. f
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发表于 2013-8-9 19:58
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