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jsspace 发表于 2014-7-2 10:56 
/ L0 Y5 Y0 L7 Q6 H% w次级不能接地,这个在61347-2-13上已经明确说明了 5 v) @& ^8 m7 o5 O% N
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?* @( z: w5 o# u1 i
6 _6 ~2 l# g6 x8 X; \% S8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
; S" F1 m# G# ]: _3 M– the rated output voltage for constant voltage control gear or maximum output voltage for( {/ ^5 C, u& D! h F
constant current control gear under load does not exceed 25 V r.m.s.;! r% ]4 m0 _4 E+ ?0 z _
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed9 b& L+ Z$ Y) M4 m' c
33 2 V.0 c7 Y; W0 S" B+ L T4 O
Compliance is checked by measuring the output voltage when steady conditions are
& T( N# |% T8 `% V ?( Gestablished, the controlgear being connected to rated supply voltage and rated frequency. For8 P2 \; s1 b4 y+ c) |& I$ P2 h' \
the test under load, the controlgear is loaded with a resistance which would give rated output9 F; Z j7 K. A [7 D. x: w$ |; f# W
at rated output voltage./ |* `" n7 [2 J" o5 ]1 U
For controlgear with more than one rated supply voltage, the requirement is applicable for" t3 L3 R& z, u) \8 M7 Q5 z9 N) y2 X& D7 s
each of the rated supply voltages.
$ y2 W: H" J- s8 xControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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