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本帖最后由 tsunn 于 2013-8-9 20:34 编辑
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- \, x3 o7 F5 G5 K各种不同的定义太累。大家有什么看法。
) _% A: A1 p! E& J j* h/ x6 SEN60335版本定义：
8 ^& d. @) N2 u4 P3.4.2
9 x1 _% B4 I0 t6 X `safety extra-low voltage7 ?7 l# A& a- ]% q& ]- F( X1 Z
voltage not exceeding 42 V between conductors and between conductors and earth, the no-
# r& R; k+ p* H9 Bload voltage not exceeding 50 V
u: d4 P2 M9 F; N$ Z& T) ?When safety extra-low voltage is obtained from the supply mains, it is to be through a
" g! ^; o$ t) R; P' A) Tsafety isolating transformer or a convertor with separate windings, the insulation of which& Q% l( M6 F, T, h
complies with double insulation or reinforced insulation requirements./ f( |# C( Y( l
NOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is6 V; L: V* ^; P5 }- M
supplied at its rated voltage., E7 J! a% z, ?5 `" m6 H$ ^
NOTE 2 Safety extra-low voltage is also known as SELV./ v3 | B4 i! ]3 V5 N
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EN60598版本定义：
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SELV (safety extra low voltage)" Z1 y6 \" o& M2 }* @
ELV in a circuit which is insulated from the mains supply by an insulation not less than that% e( l$ \+ b# Y0 Z! g; V8 A) u) B
between the primary and secondary circuits of a safety isolating transformer according to
0 n, D% _! Y. h7 o$ VIEC 61558-2-6 or equivalent
( D+ ^$ U+ |: ^4 N; q7 L+ sNOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular
8 o6 n T' |( K( [9 ]- J+ ~8 Qrequirements, especially when direct contact with current-carrying parts is allowed., ] _$ |3 a5 p
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* R$ @0 ~. P$ M) b- o+ U( h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）0 N/ p2 {# {% r9 T$ J E
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发表于 2013-8-9 19:58
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