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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+ A1 X$ a. x" E' z# w* T
8.1.4 An accessible part is not considered to be live if- M4 I2 e' R$ a9 q! ?2 d9 d
– the part is supplied at safety extra-low voltage, provided that
* c8 O) R7 x4 O. o$ D, ~• for a.c., the peak value of the voltage does not exceed 42,4 V,
: a+ ~$ i8 `: x• for d.c., the voltage does not exceed 42,4 V,8 _9 S0 T1 C& S. X' B4 S
or
% r! x" T1 U1 P$ g– the part is separated from live parts by protective impedance.
* J w" B+ u1 \* }If protective impedance is used, the current between the part and the supply source shall
% Z r. }1 M# B8 snot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
' P" B }, L% L0 }– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance( i# R$ L- U9 N$ A! v; o. r
shall not exceed 0,1 μF,; a; f" ^- {3 o9 `
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall, s7 j& J6 d, z5 h& ~
not exceed 45 μC,
" W. l" M3 f+ m( L; i– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed2 m. g, x% N) Y# K' D# Z% V8 ^
350 mJ.1 x* W4 j% ]4 K: x3 f
Compliance is checked by measurement, the appliance being supplied at rated voltage.
Y. l, ], i# n' z8 A2 I C+ xVoltages and currents are measured between the relevant parts and each pole of the supply
( A' o2 ]2 M' `4 v, qsource. Discharges are measured immediately after the interruption of the supply. The
) B# H6 c$ p1 E$ C" t% Lquantity of electricity and energy in the discharge is measured using a resistor having a
% F# d6 a1 c; G# P; c, C% k+ ~/ Wnominal non-inductive resistance of 2 000 Ω.
' `2 N1 u1 A* v" y4 x: W; Q: q结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
' X3 n3 e0 b- i7 H: \or reinforced insulation.$ ~* G6 S6 x: {8 `$ }, S
22.42 Protective impedance shall consist of at least two separate components whose$ j a1 w! G% }9 _% W
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
. u/ _! i( Y' L0 j, pthe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
- }6 C0 A6 E0 |5 y4 u) u" M- }$ ?exceeded. |
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