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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
( ?: K7 `+ |3 C( h* ^5 q" ^, N8.1.4 An accessible part is not considered to be live if& r1 K; [* g$ d2 y
– the part is supplied at safety extra-low voltage, provided that
# D5 }6 R8 m- `; s7 T/ N• for a.c., the peak value of the voltage does not exceed 42,4 V,
[, @8 d+ O. i• for d.c., the voltage does not exceed 42,4 V,
; f) h. G0 c s6 }0 vor
' ]) H5 W9 i F, u. n/ k+ H2 U h– the part is separated from live parts by protective impedance.( G& M- u1 a! _$ r! D
If protective impedance is used, the current between the part and the supply source shall
8 i- {" t, ^& r l9 `not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and) U# a9 q n) d) u
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
3 I; U; {- n' r; q6 R. wshall not exceed 0,1 μF,. k$ S; s% Z, J* H/ m0 F( O
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall5 V d7 f! `* m( t7 |% @6 S# F) T. c
not exceed 45 μC,
% [# k) ~" `; n0 n* J– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed
$ X# g4 H8 p* T350 mJ.
! B3 q3 E5 u+ ~+ h) |* W! u qCompliance is checked by measurement, the appliance being supplied at rated voltage.
% x2 r j* j1 C6 y5 H1 K* ^Voltages and currents are measured between the relevant parts and each pole of the supply m: F$ A5 ]3 T0 N+ d' I! p
source. Discharges are measured immediately after the interruption of the supply. The
6 g+ V- e3 s* l$ t! Pquantity of electricity and energy in the discharge is measured using a resistor having a
2 t! T+ a3 ]1 M. _1 f `- ?5 Rnominal non-inductive resistance of 2 000 Ω.' O& C) Q' g2 s4 A. p
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation6 w4 S- m; Q9 T# }& h3 u5 |6 Q
or reinforced insulation.
+ O0 x3 @" z9 m+ R U$ s4 ~% D22.42 Protective impedance shall consist of at least two separate components whose7 l& U9 u) G9 f# W% i
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
4 A7 E9 |5 H# b: bthe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be" H8 n% B! h+ W7 j3 E. U& F
exceeded. |
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发表于 2008-5-7 11:22
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