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jsspace 发表于 2014-7-2 10:56 
# C& ~! Y4 ?% s2 A5 o次级不能接地,这个在61347-2-13上已经明确说明了 ) n# D& z4 U1 s0 [4 v3 i! [3 k! [9 C
依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地?; ]& L1 o# t" a
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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if2 a9 X1 w! }/ x2 K! @! V) h/ h
– the rated output voltage for constant voltage control gear or maximum output voltage for
/ E5 I! u( X. cconstant current control gear under load does not exceed 25 V r.m.s.;
7 g# A9 @3 k: B$ l! r– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
# f7 v/ |% y7 A, o/ [33 2 V.
" P. v1 j; b0 y5 H, q4 z/ ^Compliance is checked by measuring the output voltage when steady conditions are3 g1 _' {! T( u6 y
established, the controlgear being connected to rated supply voltage and rated frequency. For' `6 W5 i4 |9 u2 s* P& z
the test under load, the controlgear is loaded with a resistance which would give rated output/ k8 t* h( X' p9 y& t
at rated output voltage.
4 }) T2 V. Q/ A q/ gFor controlgear with more than one rated supply voltage, the requirement is applicable for
0 H+ Q+ c) A& v2 {5 v# Ieach of the rated supply voltages.4 h1 c& w. X# j& ?- E4 _6 [
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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