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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
( F' @& i) N2 W) q# o8.1.4 An accessible part is not considered to be live if! x/ `& B3 Z) w! T8 m9 B! a" Y4 j& K
– the part is supplied at safety extra-low voltage, provided that
2 p8 O; U7 i# O# v6 u4 F1 e• for a.c., the peak value of the voltage does not exceed 42,4 V,& M: ~& ~' b7 U) }! U# C" a
• for d.c., the voltage does not exceed 42,4 V,
/ T o' @- ^5 j2 Y, Yor
1 Y- f( e3 x( \( i9 z0 s– the part is separated from live parts by protective impedance.# }. j8 T& m& {& _' J1 [0 x
If protective impedance is used, the current between the part and the supply source shall
/ H0 l: l X- p" r2 L2 nnot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and7 Y1 y% q" S1 u6 u
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
4 u) h4 N1 X+ o# z; @; z- I$ cshall not exceed 0,1 μF,
) }0 w# ?. _. l z– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall7 x+ B: N! {8 J" J/ M# _/ B
not exceed 45 μC,
& M) Q! t: K1 d( B2 E. b! }– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed; ] y6 @- T1 {$ d: g0 t
350 mJ.
4 B2 m% ]) K! D. ]) {; u# LCompliance is checked by measurement, the appliance being supplied at rated voltage." W0 R U6 t- {1 O$ F
Voltages and currents are measured between the relevant parts and each pole of the supply
* H' s/ V6 B9 U4 b$ nsource. Discharges are measured immediately after the interruption of the supply. The$ _ y5 T! J! e+ P, j
quantity of electricity and energy in the discharge is measured using a resistor having a
/ z2 z# |" t3 M, \* s: k( lnominal non-inductive resistance of 2 000 Ω.
/ c$ ?. s r* P( W$ W) T结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
$ `3 e. d0 `/ e: S. |* ?or reinforced insulation.
* f+ y5 ^: Z7 i* \22.42 Protective impedance shall consist of at least two separate components whose
' X$ \& z4 [. N6 `impedance is unlikely to change significantly during the lifetime of the appliance. If any one of! U' Z8 l2 C( b
the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
5 ]7 b% V, X; I: Jexceeded. |
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