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jsspace 发表于 2014-7-2 10:56 
2 v% `5 A+ m6 K- U次级不能接地,这个在61347-2-13上已经明确说明了
/ V. e u1 L% U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?2 R0 P( U0 Z1 c5 [8 d1 p+ ]* j
4 V& j" Z6 p8 L4 L0 m$ z ~
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
. p! H* g5 @& K" J! h7 H/ @ I– the rated output voltage for constant voltage control gear or maximum output voltage for9 U, U" q- ^/ {- I& `+ W- d" V. D
constant current control gear under load does not exceed 25 V r.m.s.;5 K' y) y$ \+ `) n& q! ?$ z
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
! X' n$ k+ `" W" H, b. {33 2 V.
9 Z7 p0 B( K7 [7 xCompliance is checked by measuring the output voltage when steady conditions are" F6 Q+ F6 M) g; k$ n* L- u
established, the controlgear being connected to rated supply voltage and rated frequency. For
9 O8 R K/ H) I" g1 o8 @the test under load, the controlgear is loaded with a resistance which would give rated output
0 t! f) l0 G3 a+ b0 aat rated output voltage.7 [7 o5 u- `' A4 ^ N
For controlgear with more than one rated supply voltage, the requirement is applicable for
; [5 H- x d: _each of the rated supply voltages.
7 `7 s' {% \0 f1 d2 G$ R! FControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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