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jsspace 发表于 2014-7-2 10:56 % |! n' \) h% V" D
次级不能接地,这个在61347-2-13上已经明确说明了 / g% {$ y# | H
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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7 n9 w) X! C1 D q( L2 q8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if! t7 k8 s! E2 N0 Z
– the rated output voltage for constant voltage control gear or maximum output voltage for
- ^4 S& R5 T$ zconstant current control gear under load does not exceed 25 V r.m.s.;7 Y6 T) M5 j: \' y# v& B" h; S( o
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed% Y( |9 ?8 @+ d; H
33 2 V.
, L# G. \5 d& d8 R- BCompliance is checked by measuring the output voltage when steady conditions are1 J9 K9 V- ^( I" ?' S
established, the controlgear being connected to rated supply voltage and rated frequency. For
`1 [9 [! q8 d* \4 lthe test under load, the controlgear is loaded with a resistance which would give rated output
9 v h# {+ i- U! G- X' xat rated output voltage.
, y0 K# S2 X0 N+ ?9 p# T5 aFor controlgear with more than one rated supply voltage, the requirement is applicable for5 x1 I% J* K* g
each of the rated supply voltages.9 j- D; P! |9 t# z+ ^. V
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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