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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" Z2 q; x, J, P7 s' [
8.1.4 An accessible part is not considered to be live if0 U1 O7 [& @ Q
– the part is supplied at safety extra-low voltage, provided that
6 E. S3 A( L0 m O. g• for a.c., the peak value of the voltage does not exceed 42,4 V,9 R0 F& T" H3 L& {" j3 ^
• for d.c., the voltage does not exceed 42,4 V,
) n3 f+ f8 W& D' a# U% h7 f$ tor& p% M8 e4 w5 N. y+ g
– the part is separated from live parts by protective impedance./ {$ o/ N7 Y3 x ]: T
If protective impedance is used, the current between the part and the supply source shall: q/ @9 y: ^) s3 V8 d
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
, O \. d& M3 o7 @– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance; L8 X- d0 t0 ?. q& z
shall not exceed 0,1 μF,) y& M6 ]$ r- _' Y2 e: t% Q" }
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall# ?: A+ {3 t" ~- v& s
not exceed 45 μC,
: q s9 f1 M- a n' c– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed. s+ k7 l8 ^7 L4 l8 q
350 mJ.
T' ]# Y7 J- r$ a7 A2 o: gCompliance is checked by measurement, the appliance being supplied at rated voltage.( V: P4 v8 U/ h( {5 y5 C
Voltages and currents are measured between the relevant parts and each pole of the supply
; G& D2 ]1 a# ]) O, lsource. Discharges are measured immediately after the interruption of the supply. The; V; n" l! ]5 ]5 G- g+ e- \
quantity of electricity and energy in the discharge is measured using a resistor having a7 w& D7 W: U3 [# ~& `
nominal non-inductive resistance of 2 000 Ω.
# A' v8 ~: j! k1 U结构满足22.27 Parts connected by protective impedance shall be separated by double insulation2 A: |" R) n/ Y- U2 ?. V2 P; o
or reinforced insulation.% t3 K5 z" S) s' h7 i2 d, R+ w7 O+ H
22.42 Protective impedance shall consist of at least two separate components whose
& |$ _3 W& T5 W) U. P0 D: nimpedance is unlikely to change significantly during the lifetime of the appliance. If any one of
2 ~: U& O! i' |8 J8 j9 h7 `" G# i# Rthe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be; K: S& e6 W3 a5 W. ?6 G6 G6 d6 D
exceeded. |
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