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本帖最后由 tsunn 于 2013-8-9 20:34 编辑 * z+ S/ e$ g6 z& ~; j
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各种不同的定义太累。大家有什么看法。
! Y* L& K% A! b7 Z; e. p& V' xEN60335版本定义：
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8 a1 X6 X7 w# | f, y: Zsafety extra-low voltage/ s; Y' g6 e8 c& [, y5 n
voltage not exceeding 42 V between conductors and between conductors and earth, the no-$ k/ j# r6 g# Y1 X7 \# d$ Z! P
load voltage not exceeding 50 V
7 S# l- B! \$ X% tWhen safety extra-low voltage is obtained from the supply mains, it is to be through a' P+ \/ {# C7 H; m/ `
safety isolating transformer or a convertor with separate windings, the insulation of which
0 p" i) }4 J; D, ~! e% X) M0 Ycomplies with double insulation or reinforced insulation requirements.1 ]- V" O. b/ G" m! G
NOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is1 z& O6 z% a% I
supplied at its rated voltage.
- v* @2 r1 p" K7 \0 |! o; p! FNOTE 2 Safety extra-low voltage is also known as SELV.
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EN60598版本定义：6 t3 C0 r' u" ?* z3 e
1.2.42.2' ]$ n4 e B, }1 j2 W2 W
SELV (safety extra low voltage)8 D- i3 J0 {; c& M9 V+ z7 h. Y1 R
ELV in a circuit which is insulated from the mains supply by an insulation not less than that. v4 @" W& A7 l: l9 e
between the primary and secondary circuits of a safety isolating transformer according to" M" d) k) Q3 o3 i, ?( |, v
IEC 61558-2-6 or equivalent
7 @* W7 w+ O2 g8 w {1 BNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular
; {2 q5 d1 V3 |( J9 Zrequirements, especially when direct contact with current-carrying parts is allowed./ Q9 z3 j' B- h- {4 R
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. D$ R$ B. p* M: t/ l! X6 J9 q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）
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发表于 2013-8-9 19:58
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