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jsspace 发表于 2014-7-2 10:56 
! @8 s; I( S* A' ]0 t/ O* l% ]4 x次级不能接地,这个在61347-2-13上已经明确说明了
" D; {" {* U, c7 j2 Q! p$ Y7 }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?
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* t' p2 I& {: l+ s5 e# V; v8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if" I. g# O" D6 Z9 M0 t3 H& d* |
– the rated output voltage for constant voltage control gear or maximum output voltage for
- l7 |! e$ g. T# m3 wconstant current control gear under load does not exceed 25 V r.m.s.;
( ^- y' ~4 o1 [9 q– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
3 C: o1 B/ D: ~- w5 ~: C33 2 V.) K% g2 J4 P9 x# n7 E" P
Compliance is checked by measuring the output voltage when steady conditions are
4 K1 X7 Q: S6 Cestablished, the controlgear being connected to rated supply voltage and rated frequency. For
8 }; [: n& H: t3 Bthe test under load, the controlgear is loaded with a resistance which would give rated output/ l& P7 W5 L* u
at rated output voltage.) X8 u7 z0 K/ I& ?' y; R" d& ]
For controlgear with more than one rated supply voltage, the requirement is applicable for
$ g. M# y( Z6 heach of the rated supply voltages.
+ `$ M& C8 }; j, U$ i6 P. f LControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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