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jsspace 发表于 2014-7-2 10:56 
3 {* \! {9 y5 u& { w% x( X次级不能接地，这个在61347-2-13上已经明确说明了
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？
3 A/ [/ @4 H) H! W" J. ^! t- P" z; Y- V- q
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if! |* u, G5 F" C2 L0 {4 |; p6 F" t* t
– the rated output voltage for constant voltage control gear or maximum output voltage for
7 }8 o1 Z3 ]$ l! w8 Q# Vconstant current control gear under load does not exceed 25 V r.m.s.;
* |5 K; P6 r: U1 S– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
$ d! j; T) J% e$ F33 2 V." [& @' }; y0 H- `
Compliance is checked by measuring the output voltage when steady conditions are$ Z* U# b$ e6 R* q7 a
established, the controlgear being connected to rated supply voltage and rated frequency. For* Y) n, u) v+ n' P6 h
the test under load, the controlgear is loaded with a resistance which would give rated output
; w' r% v) \% t9 Lat rated output voltage.
' j! W/ V" [" B* W F; r% MFor controlgear with more than one rated supply voltage, the requirement is applicable for" C, {' x/ P" X1 X6 ~( `8 M$ _
each of the rated supply voltages.
8 E+ y7 [/ J9 m/ TControlgear 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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