|
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
3 R# m5 O" a# v* a8.1.4 An accessible part is not considered to be live if0 L: z6 f/ k9 R
– the part is supplied at safety extra-low voltage, provided that7 t L$ X- Q( N2 \4 k
• for a.c., the peak value of the voltage does not exceed 42,4 V,# Z; h7 l r& l! k% }
• for d.c., the voltage does not exceed 42,4 V,/ y/ Q9 G0 q; h% m, k: k3 s+ K
or& l- ?' c, E& r3 [4 f0 L
– the part is separated from live parts by protective impedance.
# t% {6 }' j, I# l& SIf protective impedance is used, the current between the part and the supply source shall0 ~$ Z. d/ z2 I' H1 C% }8 Q/ T
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and X& S0 [& O+ `( V0 N. m3 _2 u
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance* z" t$ v' O0 B% N8 ^
shall not exceed 0,1 μF,$ K! i& M& l8 ?
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall
8 y ^" a& c1 l; u1 ^: E; Cnot exceed 45 μC,
, X( b3 ~6 F* i& [, u– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed2 P7 A8 F3 q3 e4 E( T3 j
350 mJ.
; C3 y2 X0 n- K0 ~7 S0 M dCompliance is checked by measurement, the appliance being supplied at rated voltage.( x' f" ?2 A/ ~" i
Voltages and currents are measured between the relevant parts and each pole of the supply8 R3 _! q$ U4 T. T9 z0 p. f u
source. Discharges are measured immediately after the interruption of the supply. The
5 G0 s# m8 _# L) Wquantity of electricity and energy in the discharge is measured using a resistor having a, S2 d+ E7 W0 I7 C/ ]2 M1 Z3 i" P+ @* ]
nominal non-inductive resistance of 2 000 Ω.
" n4 u! B* z& G5 V: V) c结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
/ {$ r' p. d: t9 N* M! U) a% dor reinforced insulation.$ c8 t" P+ X3 E; `3 b" q
22.42 Protective impedance shall consist of at least two separate components whose
) D9 H, d; B) L0 v& P2 L7 Bimpedance is unlikely to change significantly during the lifetime of the appliance. If any one of2 I* N$ h3 Q# J$ }
the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
, `; n s4 I* T0 B5 |exceeded. |
|