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增加距离是一种方法,但有时由于产品的实际设计,距离过大又是不允许的.所以对用于整机产品的负离子发生器最好把做成不认为是带电部件
1 I7 w4 e& ?* y' |: @8.1.4 An accessible part is not considered to be live if
. H$ E- c, |- _' i; T– the part is supplied at safety extra-low voltage, provided that
6 k7 a9 [; b' i* z2 {& n0 B! t• for a.c., the peak value of the voltage does not exceed 42,4 V,
B3 T& J4 Z& A( D• for d.c., the voltage does not exceed 42,4 V,5 D, z' \' q" n3 F( `3 e% l
or
, N1 x/ j% [9 k. l" Z* p+ m– the part is separated from live parts by protective impedance., Z3 K9 H" }0 q/ \
If protective impedance is used, the current between the part and the supply source shall' Y# O. S* b H3 M& ]$ z
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and" y5 D& y. K* W
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance) n, }, Y" I# E7 J
shall not exceed 0,1 μF,5 N5 L, `4 u3 p# n
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall+ Z: K m' |* D" K6 `
not exceed 45 μC,
9 o0 ^9 E$ `+ L b8 v2 m/ d1 I i– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed1 [) f9 f7 y4 n& B8 |. e
350 mJ.5 H% H: @8 L2 O
Compliance is checked by measurement, the appliance being supplied at rated voltage.
4 V& j9 c2 @- D8 s5 e2 b( PVoltages and currents are measured between the relevant parts and each pole of the supply
! v, I7 I9 j. z& [source. Discharges are measured immediately after the interruption of the supply. The z# b7 h% B/ L' ?
quantity of electricity and energy in the discharge is measured using a resistor having a
* ^: j9 U: _8 v3 h c- ], a/ Ynominal non-inductive resistance of 2 000 Ω.
' s. Z5 T6 u: l- z) r- T结构满足22.27 Parts connected by protective impedance shall be separated by double insulation( j. K p$ f# H* _& ]/ o7 H
or reinforced insulation.6 c; e5 m- f" L I
22.42 Protective impedance shall consist of at least two separate components whose+ b0 A B- _, N. P0 s, E
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of! D v( W& S+ Q. ^) C# b: `/ Z
the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be4 e1 G0 \/ @. l" r5 s6 D
exceeded. |
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