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本帖最后由 tsunn 于 2013-8-9 20:34 编辑 $ \+ @! r( w; E) f# O8 i
- W8 b+ [& K0 r ?- y: r各种不同的定义太累。大家有什么看法。
4 o X. h% Y0 S6 G0 S: cEN60335版本定义：- A g1 r3 M5 q8 Y
3.4.2
/ S4 Q1 _- d; Z& E+ j/ h5 B; R) ksafety extra-low voltage; o$ p# x4 K8 C, V& K
voltage not exceeding 42 V between conductors and between conductors and earth, the no-4 P$ S5 f" o: f& }6 ]2 T; Q4 _$ {
load voltage not exceeding 50 V- a# s2 c' b$ p/ z+ R. K2 l
When safety extra-low voltage is obtained from the supply mains, it is to be through a$ \6 d7 a8 y+ Z
safety isolating transformer or a convertor with separate windings, the insulation of which
Q9 Z, {7 V2 |/ qcomplies with double insulation or reinforced insulation requirements.
/ { _' i4 G" JNOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is2 F7 q+ Q/ I9 `+ Q' _
supplied at its rated voltage.% R; D, X/ J6 _: m6 F5 m
NOTE 2 Safety extra-low voltage is also known as SELV.
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$ m/ J9 f* p: O6 C4 D. ~* KEN60598版本定义：
- ^- q' D! W( u1.2.42.23 h1 Y U" a# o4 K% ?/ z: L
SELV (safety extra low voltage)
: p; f1 D4 |: X9 H6 T) V9 H8 pELV in a circuit which is insulated from the mains supply by an insulation not less than that
( J$ F: w$ b* D+ t9 Lbetween the primary and secondary circuits of a safety isolating transformer according to
X+ X9 d3 m! ^! x* k- KIEC 61558-2-6 or equivalent
! _; k+ K+ L E" L0 g( TNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular5 j" h) C+ @; R
requirements, especially when direct contact with current-carrying parts is allowed.
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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）7 B9 \3 R) ?! ^- G% B. S+ `5 @4 p
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发表于 2013-8-9 19:58
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