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jsspace 发表于 2014-7-2 10:56 ) d4 Z+ s# K5 x' f( y' Y6 w% X+ u
次级不能接地,这个在61347-2-13上已经明确说明了
, {2 R g$ F' I1 q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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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if( E- g$ T9 z6 O2 e: {# O
– the rated output voltage for constant voltage control gear or maximum output voltage for
# h- a8 C2 l2 B, ?# Sconstant current control gear under load does not exceed 25 V r.m.s.;% u" d5 B5 C' ^6 A) Y
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
' S4 G( J. r% q$ o( {: B9 a4 y33 2 V. J6 o5 j* d0 R! [
Compliance is checked by measuring the output voltage when steady conditions are
. \. j# A- @' \6 P0 \, Testablished, the controlgear being connected to rated supply voltage and rated frequency. For4 x4 l' l% o b' u0 I
the test under load, the controlgear is loaded with a resistance which would give rated output( |" S/ N6 S) Q9 ?: U" m
at rated output voltage./ k5 ^5 Q c7 U5 ?2 M+ ]9 E
For controlgear with more than one rated supply voltage, the requirement is applicable for9 r% [1 D( ]& Y7 K# U/ W
each of the rated supply voltages.
; C5 ?' G- b" k# ?0 K. H4 LControlgear with a rated output voltage above 25 V shall have insulated terminals. |
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