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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) C- X; o0 u5 u* k% [2 e) c
8.1.4 An accessible part is not considered to be live if/ y. s8 [; q$ q5 O- l6 p
– the part is supplied at safety extra-low voltage, provided that
- P0 e3 ]* k( ?$ ~+ r• for a.c., the peak value of the voltage does not exceed 42,4 V,- G1 P! |# o* m Y( @1 {; d: T" t$ y
• for d.c., the voltage does not exceed 42,4 V,( h" _8 ]) H9 d
or
* a7 W1 v8 R+ ]" ~' Y* \– the part is separated from live parts by protective impedance.3 F" o- J$ O. ^( \5 \
If protective impedance is used, the current between the part and the supply source shall
0 G) K# Q+ I8 x( ^! b" o4 cnot exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and% j8 L4 Z. l+ A M! Q
– for voltages having a peak value over 42,4 V up to and including 450 V, the capacitance+ L9 G. M# f' M9 s
shall not exceed 0,1 μF,+ O; f V! c5 g- {1 t, M9 c% l! S
– for voltages having a peak value over 450 V up to and including 15 kV, the discharge shall
+ F/ [4 U- j; H. l: M; }% {8 `not exceed 45 μC,
+ D8 z/ p8 _ {' r; s! d/ m9 ], }; s4 A– for voltages having a peak value over 15 kV, the energy in the discharge shall not exceed9 G/ ~) O5 K w' B& n
350 mJ.
1 w& Q3 Z: k7 N) I& q/ @Compliance is checked by measurement, the appliance being supplied at rated voltage.3 h5 c: m) K5 M4 G9 U; K4 C8 q
Voltages and currents are measured between the relevant parts and each pole of the supply, @; y6 V) X& |8 N; I, [! [
source. Discharges are measured immediately after the interruption of the supply. The' q- ?* H6 R; w6 l" |0 ?
quantity of electricity and energy in the discharge is measured using a resistor having a" \" e. t; R# q. N
nominal non-inductive resistance of 2 000 Ω.: I, Y3 g& S1 v: v7 P% P
结构满足22.27 Parts connected by protective impedance shall be separated by double insulation
2 H# h7 @4 @- R: W7 }$ r" l: Y5 c$ E- Zor reinforced insulation.
: s- ?1 S9 c7 y2 j. L22.42 Protective impedance shall consist of at least two separate components whose7 f5 Q7 _! U: C4 z
impedance is unlikely to change significantly during the lifetime of the appliance. If any one of
4 c, `& ]5 X7 M9 u0 k' G5 rthe components is short-circuited or open-circuited the values specified in 8.1.4 shall not be
# Z7 Y* u: R( ~ [/ l$ c, c" Mexceeded. |
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