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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- b0 @' G/ y- n) ?8 f( ?
8.1.4 An accessible part is not considered to be live if3 [0 v x7 I$ o: a+ C1 P% I7 m
– the part is supplied at safety extra-low voltage, provided that: ?2 q' u* o/ B! e5 e3 {: u# j
• for a.c., the peak value of the voltage does not exceed 42,4 V,& M8 H" U4 Z% C, T4 ]# u! C* \
• for d.c., the voltage does not exceed 42,4 V,3 N) n8 R: W, |/ x+ x$ Z/ _
or# |4 Y4 B: e8 {8 Z* H2 Y
– the part is separated from live parts by protective impedance.
% {# q8 i6 ` r$ _3 D! L9 nIf protective impedance is used, the current between the part and the supply source shall" H- e2 U5 ^5 I2 J# x! e4 `
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and$ i. Z1 j4 C1 X5 a% G
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
: C8 X; L7 A' tshall not exceed 0,1 μF,: r7 d1 A6 Z% h O
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall# W% o% |4 x( v1 k2 D
not exceed 45 μC,
! S E0 k# @* O7 d# R6 h4 J4 `! F– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed3 W+ d0 ^/ O* W. ?5 T6 O6 }' c5 |
350 mJ.2 M9 h5 y1 m3 `2 \3 V9 o& L& j
Compliance is checked by measurement, the appliance being supplied at rated voltage.2 Z& e G* s# q
Voltages and currents are measured between the relevant parts and each pole of the supply
6 f" g0 {% P+ m9 v6 e9 Bsource. Discharges are measured immediately after the interruption of the supply. The
5 t2 \" @% i: Tquantity of electricity and energy in the discharge is measured using a resistor having a. f+ a p, |, E2 z4 g$ v' T
nominal non-inductive resistance of 2 000 Ω.
4 w8 {9 Z* q5 C4 B/ W6 J+ w结构满足22.27 Parts connected by protective impedance shall be separated by double insulation: @$ ?, j9 U% g1 E f6 x. G
or reinforced insulation.
V1 E7 y7 g( m8 D2 x22.42 Protective impedance shall consist of at least two separate components whose# O% D; @) o: i* _3 b
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
' W i* C! U1 A7 C# L4 V# }the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be& O+ v" c% b/ W
exceeded. |
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