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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
. j# U, E ?4 B. q5 P& p8.1.4 An accessible part is not considered to be live if
1 D. F+ K4 E# n– the part is supplied at safety extra-low voltage, provided that7 j L A: i0 M7 d5 t. U* i, X$ B
• for a.c., the peak value of the voltage does not exceed 42,4 V,7 y1 v9 n5 G0 y% ]. V
• for d.c., the voltage does not exceed 42,4 V,
8 {$ V& x6 X9 [6 uor
; A) |# v k! h. j– the part is separated from live parts by protective impedance.
( t6 W# P% s: ~, H; }If protective impedance is used, the current between the part and the supply source shall
5 m9 j1 ?: r5 K3 y# w% vnot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and+ }- h6 \1 {- F9 j7 U% R
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
* a: Y* H9 S* |. h/ j2 d1 `+ Gshall not exceed 0,1 μF,
. a/ V* ?$ x$ S1 u% Y0 K3 q: ]! H– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall
/ G6 B$ V4 V/ e9 k6 G) y) t: anot exceed 45 μC,
8 \% o* W9 ` j# @- z+ a0 Z. D– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed
; f/ D5 I/ X, ^3 K5 [350 mJ.
* ?' \0 r" V5 x! `) q& _0 |Compliance is checked by measurement, the appliance being supplied at rated voltage.
9 r% z6 L, {# E: S3 y( t/ l( PVoltages and currents are measured between the relevant parts and each pole of the supply r# B& b$ Z2 `% v9 b* _3 }2 ^
source. Discharges are measured immediately after the interruption of the supply. The
1 q* W; m Y: z/ lquantity of electricity and energy in the discharge is measured using a resistor having a" N# ?( B& @2 f4 F% x! {# j& S
nominal non-inductive resistance of 2 000 Ω. i8 l: r/ X+ [' M
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
$ S5 v" E- m& C% o& n) ]) O; b5 Dor reinforced insulation.
$ C9 X- A! y4 a+ ^; D6 x! d22.42 Protective impedance shall consist of at least two separate components whose: I* x* D5 S* ~; l* N9 J/ @4 r
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
9 Q1 y; Q% q+ f& l* }the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
6 Z" r C6 j$ \. O& Rexceeded. |
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