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jsspace 发表于 2014-7-2 10:56
0 [# m* u$ ?" [; L& l0 o- v n次级不能接地,这个在61347-2-13上已经明确说明了
3 ^, n) w0 ]- V- y: k8 Z2 G. D# M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?! u1 o0 g" G2 M5 ?
: y, |9 g: ~, ^1 q8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
8 Y7 b; `9 Z" T: O$ x– the rated output voltage for constant voltage control gear or maximum output voltage for+ y) W6 P! C1 Y
constant current control gear under load does not exceed 25 V r.m.s.;
, H6 g" @8 X0 t) _; {3 H6 l$ l* q– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
; r d/ p* Y" q33 2 V.
$ C; X4 u# ?; H; Q' V4 TCompliance is checked by measuring the output voltage when steady conditions are
! m; H% U- I. P: d' u0 Uestablished, the controlgear being connected to rated supply voltage and rated frequency. For6 V( l% H: L7 Q- t( }" ]7 I; [
the test under load, the controlgear is loaded with a resistance which would give rated output$ V( J! k- O8 q+ R% s
at rated output voltage.4 F$ l s3 L" X1 w
For controlgear with more than one rated supply voltage, the requirement is applicable for
$ I* ]5 Z+ ?/ U4 j% x8 Beach of the rated supply voltages.
v' S' T$ k: g4 w$ I. UControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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