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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
$ ^( m' f/ z0 a- O U" e8.1.4 An accessible part is not considered to be live if; w& R$ b& M: b* |4 j; {( o! a
– the part is supplied at safety extra-low voltage, provided that
0 R- v3 \2 p) C# z& [- s: z• for a.c., the peak value of the voltage does not exceed 42,4 V,+ e& ^6 z( U# i4 F
• for d.c., the voltage does not exceed 42,4 V,
$ R5 L+ e3 E5 }. ~) N# y4 aor
9 Z7 U3 D4 F, F- N; R– the part is separated from live parts by protective impedance.7 ^9 ~5 L# D4 x
If protective impedance is used, the current between the part and the supply source shall
$ [1 M# {" y8 |8 L( y g5 enot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
2 p; n) s, N7 G0 u– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance
& |. I8 }3 O0 _( V! A; Hshall not exceed 0,1 μF,
' R. X, R# a3 ~6 u7 X6 z3 q( u: ^– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall/ A0 E; I3 N. a/ Q0 t
not exceed 45 μC,* }$ f5 V2 N P9 \1 n# l. i: d
– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed- A9 I9 M4 J: L# x) M: d& K( S. A' C
350 mJ.
- C; r- A+ B4 {9 QCompliance is checked by measurement, the appliance being supplied at rated voltage.
9 z G5 n- k! @) n$ iVoltages and currents are measured between the relevant parts and each pole of the supply
' u1 u4 Z1 u4 Y3 l* ]source. Discharges are measured immediately after the interruption of the supply. The
9 }: a# {; F4 w* J( ?0 Wquantity of electricity and energy in the discharge is measured using a resistor having a
' a9 ^' _7 n7 k, N( p" inominal non-inductive resistance of 2 000 Ω.& g) s3 `" Y) M/ ^ k% C
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
# h l& `& ^. o. b! n" B+ gor reinforced insulation." L8 a" k7 ?. i
22.42 Protective impedance shall consist of at least two separate components whose
: O$ b3 P4 ?0 I0 h, ^impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
. \# m8 I7 f4 h: \3 g& c5 ethe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
% P8 S" Y/ U( h" g3 g0 mexceeded. |
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