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jsspace 发表于 2014-7-2 10:56  # f2 M" S X' c+ Z, o
次级不能接地，这个在61347-2-13上已经明确说明了
( L* ~: E) ~+ {1 s" Y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？
: R: w* u5 X/ T$ ~: h3 Y# U! R& z' A; ~* B/ q6 A- `2 v' R
8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
3 k! z) c- Q( F5 W+ w0 ~– the rated output voltage for constant voltage control gear or maximum output voltage for
8 m" W8 S+ a# L0 a9 l3 m: Z( `constant current control gear under load does not exceed 25 V r.m.s.;
z; n' h" e7 _5 K) h– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed- [; g# ]. s b) D4 |; o& @! f
33 2 V.2 h& ^8 S7 r) w2 M5 P0 A: k9 A% M4 e
Compliance is checked by measuring the output voltage when steady conditions are
# p; }+ f. g. O2 c: jestablished, the controlgear being connected to rated supply voltage and rated frequency. For/ @. n- F' j( s1 K4 r5 t% l; S
the test under load, the controlgear is loaded with a resistance which would give rated output
$ z% J9 H, ?9 d. e n6 Iat rated output voltage.# p* |- R. c3 u; N3 p/ q" w* R. E# U
For controlgear with more than one rated supply voltage, the requirement is applicable for
& K1 y0 C0 J2 |& x2 Eeach of the rated supply voltages.
, U9 Y. L( C, \* A4 D' vControlgear 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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