|
|
jsspace 发表于 2014-7-2 10:56 
R$ T$ u4 E6 b: P4 i- o& H7 k次级不能接地,这个在61347-2-13上已经明确说明了
+ Z( c- m: c5 x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?
8 n" s4 e7 W7 V2 N, h( `& ?; Q# }1 ^( B8 ?+ V2 I& W, m
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
& b8 W+ W8 _4 q! a2 X% N( m– the rated output voltage for constant voltage control gear or maximum output voltage for' d5 {' k& o: k! J( l( I* _
constant current control gear under load does not exceed 25 V r.m.s.;* g% W. K/ H4 ]6 T5 k1 m& ^/ U' D9 Q
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed% h0 [( i: q7 [0 @0 [8 D
33 2 V.6 ?% O% z/ e# D8 Y
Compliance is checked by measuring the output voltage when steady conditions are& r7 ~) m' P3 o* y
established, the controlgear being connected to rated supply voltage and rated frequency. For
5 F; ^; N9 S ^& p( N3 ^the test under load, the controlgear is loaded with a resistance which would give rated output+ Y& x* U( p! J* _/ d; M- E
at rated output voltage.
' a; d- H2 I, m2 lFor controlgear with more than one rated supply voltage, the requirement is applicable for
- v' o2 K9 o7 n3 reach of the rated supply voltages.
U7 X6 o3 v1 bControlgear with a rated output voltage above 25 V shall have insulated terminals. |
|