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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。
, M6 R) a* X0 P0 b- d' n# [% ^1 JEN60335版本定义：, d/ n! S3 Z3 d) ]
3.4.2
, }7 @. J4 k; `4 K& ssafety extra-low voltage
- l5 l+ q1 e& n( \voltage not exceeding 42 V between conductors and between conductors and earth, the no-
: f8 o ]. S! d. Kload voltage not exceeding 50 V
* x) Q! E2 K0 Y- F9 n1 o# f+ ]( dWhen safety extra-low voltage is obtained from the supply mains, it is to be through a) T' P$ w3 u7 x2 \( s: ^4 U$ C
safety isolating transformer or a convertor with separate windings, the insulation of which4 |4 I9 z& P) ~1 d+ y
complies with double insulation or reinforced insulation requirements.0 _- y% e4 D7 V# i4 O* S
NOTE 1 The voltage limits specified are based on the assumption that the safety isolating transformer is5 o5 F1 W: H6 L# i, e( N% I7 `
supplied at its rated voltage., A( z# H) X% l- V1 _- W
NOTE 2 Safety extra-low voltage is also known as SELV.
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EN60598版本定义：' ]( g. ~ B9 r" }- s/ R- w
1.2.42.2
+ m3 [- j6 N" E: i( H! cSELV (safety extra low voltage). v. p3 k! l! J% n
ELV in a circuit which is insulated from the mains supply by an insulation not less than that- Q9 O/ a- k }5 I F3 P
between the primary and secondary circuits of a safety isolating transformer according to
$ A' ~. h2 K5 Z' w( DIEC 61558-2-6 or equivalent" B$ K8 b2 v6 x$ t( f& f+ u
NOTE Maximum voltage lower than 50 V a.c. r.m.s. or 120 V ripple free d.c. may be specified in particular4 V3 P3 [- f7 T" c/ c
requirements, especially when direct contact with current-carrying parts is allowed.- | o' T7 r) {% g' T0 D! n5 e
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/ k3 M/ G- P+ j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）* C2 P; ?' O* S8 D* ]: C3 x
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发表于 2013-8-9 19:58
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