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jsspace 发表于 2014-7-2 10:56 
1 b B) V) \7 t! T1 K次级不能接地，这个在61347-2-13上已经明确说明了
, }+ E! w3 y1 Y! p9 }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？, C5 T8 D, g# |+ i+ H# {
1 G8 w1 E4 r0 V) I9 R! Q
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if) _1 a: w& s: V- f: v7 |+ z6 a
– the rated output voltage for constant voltage control gear or maximum output voltage for
0 G) h2 J |3 b4 Zconstant current control gear under load does not exceed 25 V r.m.s.;1 j6 v+ A u9 f6 l% l' n( K
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed* J# i9 O7 s. i q
33 2 V.
, i! q: e! G+ O3 q A& w+ ^Compliance is checked by measuring the output voltage when steady conditions are4 r/ N3 | @& m' ^! H
established, the controlgear being connected to rated supply voltage and rated frequency. For# C0 p, w$ ]1 V4 A
the test under load, the controlgear is loaded with a resistance which would give rated output
. D/ |# w9 F* }. T- m. y; p% Vat rated output voltage., x6 ~ w2 j8 X6 v) J6 t
For controlgear with more than one rated supply voltage, the requirement is applicable for3 K+ i- s# h" l( U# c4 s. D
each of the rated supply voltages.
4 M/ g. T6 K$ C6 PControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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发表于 2014-7-2 10:56
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