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本帖最后由 tsunn 于 2013-8-9 20:34 编辑
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各种不同的定义太累。大家有什么看法。/ C V0 T6 C( G- D" m( H9 i$ B
EN60335版本定义：
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; Y" k( V! V K' `safety extra-low voltage
; N E4 T" l# i! V* qvoltage not exceeding 42 V between conductors and between conductors and earth, the no-% o- ~* |1 v+ ?/ \3 L
load voltage not exceeding 50 V3 B, \ h% Q7 K% T
When safety extra-low voltage is obtained from the supply mains, it is to be through a
0 v2 B& o& Z4 x/ I# Asafety isolating transformer or a convertor with separate windings, the insulation of which& r, ]0 s2 f! e5 Q
complies with double insulation or reinforced insulation requirements.
0 R4 V3 ~9 ]( K; JNOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is
% E( t% y( ^. t: ysupplied at its rated voltage.
" f$ ^: R- K. ]9 ]* _$ WNOTE 2 Safety extra-low voltage is also known as SELV.
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EN60598版本定义：" U, J/ b. _ S3 r
1.2.42.2
: k( q* J) w- B% gSELV (safety extra low voltage)8 _# v4 N3 i* W
ELV in a circuit which is insulated from the mains supply by an insulation not less than that# q0 R) R- j5 [! Z3 f1 F
between the primary and secondary circuits of a safety isolating transformer according to! U* s. M- L. `( M% X7 y
IEC 61558-2-6 or equivalent- Q; ?) c7 v4 x6 y& k$ {" f: C
NOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular$ ^8 N2 U- E, Z8 V1 Y
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）; k5 N3 H/ N' v: U2 ~* E* S
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发表于 2013-8-9 19:58
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