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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3 o g* Y: `6 h' D
8.1.4 An accessible part is not considered to be live if
4 B: q) J# z8 t9 M* Y, ]– the part is supplied at safety extra-low voltage, provided that
* P) D9 F3 S2 |0 f• for a.c., the peak value of the voltage does not exceed 42,4 V,
o6 _0 C5 C! {3 O2 p# i• for d.c., the voltage does not exceed 42,4 V,( D f; b: C% }) W* t1 M
or
1 d" r( s% l& V, O6 N– the part is separated from live parts by protective impedance.1 [6 U5 _3 k( `) h7 k
If protective impedance is used, the current between the part and the supply source shall
: g( J7 h" J- A, cnot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
6 u0 [, M1 t$ i, N5 I– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance) |9 [0 n7 U9 K6 G A2 p% r
shall not exceed 0,1 μF,+ P/ t5 ~3 { `, o A% g
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall( l ^7 v7 H* W! z* W1 K6 |0 }
not exceed 45 μC,
; \6 R& B& |' ~4 e0 P0 G– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed, v. x6 w" p6 M6 j( M, h4 J
350 mJ.
D) N( z1 ^' p: t7 b8 p8 lCompliance is checked by measurement, the appliance being supplied at rated voltage.
& y5 l/ k6 B" p+ b' CVoltages and currents are measured between the relevant parts and each pole of the supply) m3 S2 B0 e% b Z5 K
source. Discharges are measured immediately after the interruption of the supply. The
3 V, v6 k, Y) B& ?. v9 ^& S- [quantity of electricity and energy in the discharge is measured using a resistor having a
3 Z9 f2 H" c) Q6 O# x2 Onominal non-inductive resistance of 2 000 Ω.; u" I, Q8 m/ K. {; V# U
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
4 W1 e% Y3 {% a2 g" j, n. y1 for reinforced insulation.7 O9 t; m! p6 W, T! r
22.42 Protective impedance shall consist of at least two separate components whose/ h9 Z* E! O2 ?$ I. g9 i& i5 o
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of) u/ d& C) B3 P! j
the components is short-circuited or open-circuited the values specified in 8.1.4 shall not be; h6 M2 n& t' G* k
exceeded. |
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