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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0 G% w: m/ }, Y
8.1.4 An accessible part is not considered to be live if: v/ N2 @* A% z- l8 f
– the part is supplied at safety extra-low voltage, provided that. K- j* J- i3 y+ B; [+ I
• for a.c., the peak value of the voltage does not exceed 42,4 V,
4 g' z& s/ Y9 E" w8 @1 y• for d.c., the voltage does not exceed 42,4 V,- a, W7 {! {, f1 b0 i
or* D1 c2 N$ F7 R6 O
– the part is separated from live parts by protective impedance.# M8 B1 }* @8 A8 x1 v
If protective impedance is used, the current between the part and the supply source shall8 V5 V3 b$ i. l0 ?
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and" J! M' H5 t4 @; a( W
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
& C- e5 T5 h* U% ~2 |5 }shall not exceed 0,1 μF,
1 x, }# Q7 Y; g( R, S. j– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall
( B4 U- L0 D; B: Onot exceed 45 μC,
- \4 K1 X: k7 L, G* K8 R4 O7 w( U– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed: \" |& P, o, Y5 l7 G9 D$ w( S
350 mJ.6 i* Z) d" Q' x7 ]1 u$ E! u/ n
Compliance is checked by measurement, the appliance being supplied at rated voltage.3 ]% f- P9 ~- l4 z
Voltages and currents are measured between the relevant parts and each pole of the supply% M7 c, ~3 i% c& H
source. Discharges are measured immediately after the interruption of the supply. The
7 ?$ b; t0 x& [0 qquantity of electricity and energy in the discharge is measured using a resistor having a
: Y* m d$ _; K( a( S4 r# p: Snominal non-inductive resistance of 2 000 Ω.) X% w$ y6 F- z; `
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation, s5 o) p! H6 f G S I# T
or reinforced insulation.: F# U5 R1 ~2 N
22.42 Protective impedance shall consist of at least two separate components whose1 Y7 C2 v& R2 f* r+ S5 T* j/ \
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
) y& O; u# l2 V. g" Rthe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
Z4 O) M7 N: @' Cexceeded. |
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发表于 2008-5-7 11:22
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