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jsspace 发表于 2014-7-2 10:56 0 ]0 P% \" y6 M' \' I3 W# @' }/ I; }
次级不能接地,这个在61347-2-13上已经明确说明了 . S7 ^2 k* o# [" F( o9 z
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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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if3 Q9 N& r Z4 G6 a
– the rated output voltage for constant voltage control gear or maximum output voltage for
' g3 \- i* o( O9 Iconstant current control gear under load does not exceed 25 V r.m.s.;
) L2 ?" t2 X8 U `, A– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
. g& G% u0 k5 R( J6 s33 2 V.
+ f4 E% u0 C3 z: h2 uCompliance is checked by measuring the output voltage when steady conditions are; s, X, y+ a2 J( D0 D8 o
established, the controlgear being connected to rated supply voltage and rated frequency. For
6 P D3 ]6 v. {. e+ J* Gthe test under load, the controlgear is loaded with a resistance which would give rated output
3 k; b" q: e* [9 D: R. L; ~at rated output voltage.6 N) Q/ i) ~# d; t" @1 c
For controlgear with more than one rated supply voltage, the requirement is applicable for
1 B0 z. R1 l) X3 Ieach of the rated supply voltages.* K- [" u$ I- H5 n0 U1 \9 E
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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