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jsspace 发表于 2014-7-2 10:56 
2 o5 @6 i! a9 ~8 \次级不能接地，这个在61347-2-13上已经明确说明了
2 \: H* P* S2 P; d$ W, W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？" P* N9 V U% f" J9 A9 j4 T
4 L" Q. p- H8 r) x
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
3 I, E* ? u* |# T– the rated output voltage for constant voltage control gear or maximum output voltage for$ m7 S/ l6 O, c1 U" ]' S- Z2 v& x
constant current control gear under load does not exceed 25 V r.m.s.;6 u+ Y' Q6 L0 e' y" e
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
% f" }- o, B& ^; c5 }) t1 Y5 H33 2 V.) Z; V4 ~% T2 y
Compliance is checked by measuring the output voltage when steady conditions are8 f; g5 f! G% Y( ?' E- ^/ [
established, the controlgear being connected to rated supply voltage and rated frequency. For
( o% ?1 X1 @! m. J- I8 T9 `the test under load, the controlgear is loaded with a resistance which would give rated output3 Y, y N1 m' X) t- C
at rated output voltage.% \7 n- j; ?' O" z+ R
For controlgear with more than one rated supply voltage, the requirement is applicable for
& }( X0 |# e/ \3 q) H& E% M9 Jeach of the rated supply voltages.
* ~0 [! j+ d- t/ R+ k% X0 sControlgear 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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