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jsspace 发表于 2014-7-2 10:56 " p( i8 s( J% h- T' L; p
次级不能接地,这个在61347-2-13上已经明确说明了 * ^( C% L F; K( G% b3 b
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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, e7 z* D$ q0 Y k/ c! I8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if% U S; F0 t% {" T) G
– the rated output voltage for constant voltage control gear or maximum output voltage for- B% @+ `( o* p6 F% ?
constant current control gear under load does not exceed 25 V r.m.s.; c( m5 u$ d/ O% q
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
3 E$ ^7 B, y& F3 q* U33 2 V.
6 _. B5 F9 I, J7 s' A# r7 ?: q/ xCompliance is checked by measuring the output voltage when steady conditions are
4 ^/ }, I- T0 {) J% H, w0 destablished, the controlgear being connected to rated supply voltage and rated frequency. For
' a7 h& `3 s: Bthe test under load, the controlgear is loaded with a resistance which would give rated output* |0 n+ y) ~( Q, Y! M9 p$ T: k5 K
at rated output voltage.
2 y3 J) y7 o/ SFor controlgear with more than one rated supply voltage, the requirement is applicable for
- r7 C2 T: V; a, T( j1 a9 s) i: Peach of the rated supply voltages.
1 ^6 @7 v; ?( D& PControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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