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jsspace 发表于 2014-7-2 10:56 8 q6 M8 w M c1 m/ _
次级不能接地,这个在61347-2-13上已经明确说明了 5 ^+ v0 t% o* c4 k9 F- ?( r0 @
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?; K# y& ?2 h3 |- N
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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
' k- B: b. }6 Q5 p! R– the rated output voltage for constant voltage control gear or maximum output voltage for4 x% X7 V' Y' D7 [1 ]" M
constant current control gear under load does not exceed 25 V r.m.s.;! r% t7 n b X) u& _7 N4 Q! \
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed! Q3 ^1 g& s7 N" d/ o* g& R/ |
33 2 V.* |# S6 p7 W% \) e+ r& ?
Compliance is checked by measuring the output voltage when steady conditions are* F* l+ P( f1 A7 Z. r
established, the controlgear being connected to rated supply voltage and rated frequency. For4 U1 y% T2 @- [5 N0 I6 j- T: L m
the test under load, the controlgear is loaded with a resistance which would give rated output. y3 T8 J [1 Y* K+ j. G Z
at rated output voltage., C! L8 O3 v) T" z7 H- u% k
For controlgear with more than one rated supply voltage, the requirement is applicable for0 L7 q% h U& [/ P* |
each of the rated supply voltages.+ l& V+ B$ n# H! |; a% ?3 D
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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