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jsspace 发表于 2014-7-2 10:56  % ^6 k8 H: l; O
次级不能接地，这个在61347-2-13上已经明确说明了
) E1 P; O2 C( \, }8 a& }# f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？' a( z, y1 v' P$ P2 w4 v- ^2 n
& e8 w8 S0 S! o4 P1 E
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
- X. ~9 K2 k8 \8 }– the rated output voltage for constant voltage control gear or maximum output voltage for4 T" }. Z, r$ ?5 Z* o. O* n
constant current control gear under load does not exceed 25 V r.m.s.;
- V) h9 h. H: [9 N6 e. t/ g– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed
; `' p4 b3 q6 e. @0 A$ Q- T$ K33 2 V.; W/ L" r; _0 J. j$ l! b
Compliance is checked by measuring the output voltage when steady conditions are
8 o; a" X% x) y" aestablished, the controlgear being connected to rated supply voltage and rated frequency. For3 I5 y/ g: K+ B% ^ }) d3 v
the test under load, the controlgear is loaded with a resistance which would give rated output
# x5 @. {0 G, i& o4 H3 mat rated output voltage.
/ k/ m) W, V) n" M1 N! wFor controlgear with more than one rated supply voltage, the requirement is applicable for9 m. [3 R% b U
each of the rated supply voltages./ L! W6 x7 l# ~( c$ M
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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发表于 2014-7-2 10:56
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