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jsspace 发表于 2014-7-2 10:56 n! c6 T# s" S1 G: K. ~4 J
次级不能接地,这个在61347-2-13上已经明确说明了
. d! b# g2 M/ }- u* K- U& G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?5 \8 t8 C* i8 S: a* \
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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
% J1 }% j" k3 P– the rated output voltage for constant voltage control gear or maximum output voltage for
" K! k: j! _0 _) X Iconstant current control gear under load does not exceed 25 V r.m.s.;
7 F7 a; Z# K9 U" R/ A6 I– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
6 d& [" Z, ?: r( Z* W9 x33 2 V.
, z6 c4 D; C8 @* g" b% qCompliance is checked by measuring the output voltage when steady conditions are
$ }0 g+ i" K, C Y; Vestablished, the controlgear being connected to rated supply voltage and rated frequency. For$ V4 h0 a3 q. [- D$ f$ r) c4 a& p
the test under load, the controlgear is loaded with a resistance which would give rated output. X5 d$ @6 m: B8 L P
at rated output voltage.
7 _2 k2 a6 I) J1 YFor controlgear with more than one rated supply voltage, the requirement is applicable for
+ ~3 }6 n, m9 S9 L. h: R1 yeach of the rated supply voltages.
, n' r5 Q& E1 A: J7 ~2 d$ IControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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