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本帖最后由 tsunn 于 2013-8-9 20:34 编辑 % W" h: D# B3 F
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各种不同的定义太累。大家有什么看法。7 y- ~3 O8 {" w9 U# a3 Y
EN60335版本定义:: |/ T4 U1 Y Q2 N6 ^& |
3.4.2% l8 w) a+ ^0 z+ m/ x
safety extra-low voltage F- l1 I6 U! {! w# T5 |2 w
voltage not exceeding 42 V between conductors and between conductors and earth, the no-
& G- ^4 ~8 e# t# pload voltage not exceeding 50 V
; j2 A) b9 N- u9 T% ^When safety extra-low voltage is obtained from the supply mains, it is to be through a% R0 ^- Y2 W/ _& X6 S' R6 L% Q
safety isolating transformer or a convertor with separate windings, the insulation of which
# V9 L# G9 J3 P4 ]complies with double insulation or reinforced insulation requirements.
0 f1 [" b: f$ `+ C& I$ S- iNOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is) S$ ?/ ?1 K& w1 q
supplied at its rated voltage.
4 c6 d- \+ ]4 o; TNOTE 2 Safety extra-low voltage is also known as SELV.7 X- A, n7 E# L4 O6 F
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z# y' g& v D! L( d0 W$ IEN60598版本定义:
$ o& o) a, n: k6 E1.2.42.2
. t. R# B4 x$ I8 T* D+ Y E: mSELV (safety extra low voltage)
. J) L9 n2 _+ H+ CELV in a circuit which is insulated from the mains supply by an insulation not less than that
- |2 w/ q9 g$ b' _$ X& I9 C. o! ]1 hbetween the primary and secondary circuits of a safety isolating transformer according to) B' y! Z: [( I0 X6 c( W( W1 C
IEC 61558-2-6 or equivalent
0 }' P# d! s& N( _# aNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular
$ j: T7 f0 g/ Crequirements, especially when direct contact with current-carrying parts is allowed.
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: Z+ K9 g8 ]9 {# i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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