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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 G% a# C1 L( ?- g ^3 O8.1.4 An accessible part is not considered to be live if$ J5 ~! n9 q% K9 K) J
– the part is supplied at safety extra-low voltage, provided that
% x! @4 e" ]4 ^; h- C+ ]• for a.c., the peak value of the voltage does not exceed 42,4 V,
8 `$ V3 V% _+ n! H' x• for d.c., the voltage does not exceed 42,4 V,
" Z8 @2 h& E! w! J: H/ Y$ lor8 } e9 g" ^2 ]
– the part is separated from live parts by protective impedance.1 h! R9 {: A' V4 B. @) Z
If protective impedance is used, the current between the part and the supply source shall
4 P* C/ w1 a9 ~1 w4 D% p* t! Wnot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and1 \1 Z& s4 C6 k- b
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance; G. I6 W: P, X/ ~
shall not exceed 0,1 μF,
/ A% o7 E6 d ?$ {– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall
2 \9 u2 F8 N' A0 inot exceed 45 μC,
! M1 q8 W4 J0 u S– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed
3 d. h5 `% [! g u7 |; m350 mJ.
* e* a1 b) ~4 ?) H$ ]Compliance is checked by measurement, the appliance being supplied at rated voltage.
; ^% {. I' V: a ~ TVoltages and currents are measured between the relevant parts and each pole of the supply
0 M5 c' R' N, [4 osource. Discharges are measured immediately after the interruption of the supply. The/ ~- w5 d/ v7 x- f- B) I1 t) W
quantity of electricity and energy in the discharge is measured using a resistor having a- p, i2 ^* M- Q# p2 g$ L1 p) x i
nominal non-inductive resistance of 2 000 Ω./ _2 ^# e- e0 |& i; }
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
! W6 T' T" n( Sor reinforced insulation.
1 g3 L R3 r! g22.42 Protective impedance shall consist of at least two separate components whose
) w) C3 k) E- Z5 O6 ]' _impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
- j; _+ a) O" i* P( U5 x6 Ythe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
8 ?3 ]0 v. w( x a4 d7 b0 @; ^exceeded. |
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发表于 2008-5-7 11:22
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