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jsspace 发表于 2014-7-2 10:56 ) ]( |6 \( P5 z5 A: `; A& h
次级不能接地,这个在61347-2-13上已经明确说明了 $ W( f/ o+ p) L" C1 L' e) w0 m2 S
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
+ P( x5 ]0 B3 x/ ~5 Z% d1 t3 p– the rated output voltage for constant voltage control gear or maximum output voltage for
) Q, H+ \: y9 Y8 i) Cconstant current control gear under load does not exceed 25 V r.m.s.;) x2 f+ [! r2 V9 s+ ]4 B f9 A; \
– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
" J# g1 m6 C& Y9 h" M1 C# v. z7 u33 2 V.6 o! E4 \: W' Q2 l# }& l
Compliance is checked by measuring the output voltage when steady conditions are
. y3 s+ Z. m5 F6 K- }established, the controlgear being connected to rated supply voltage and rated frequency. For+ d% r4 d4 J. f; n# t9 F5 H: D" v
the test under load, the controlgear is loaded with a resistance which would give rated output
- J# N, Y8 D; Iat rated output voltage." F$ t# B# J3 f/ a
For controlgear with more than one rated supply voltage, the requirement is applicable for% f$ e; b ^8 A' w
each of the rated supply voltages.9 D8 o! V4 q$ K. ]
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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