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本帖最后由 craigyu 于 2014-8-4 18:08 编辑 / {+ \6 L- \( C5 X" W y. M
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3.3.6
# q1 Q# s' [ Vprotective impedance
1 _4 ~ V8 J3 P, q2 t+ x& ]* K. c' simpedance connected between live parts and accessible conductive parts of class II* y/ k1 S C0 E6 v2 ]) [
constructions so that the current, in normal use and under likely fault conditions in the1 v9 h4 C7 C# |3 F, N6 d
appliance, is limited to a safe value
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( V: {: O7 Z0 G1 S: |7 `8.1.4 An accessible part is not considered to be live if5 C" P3 C7 G/ ^1 w! x
– the part is supplied at safety extra-low voltage, provided that' F8 U5 j. a7 |- k
• for a.c., the peak value of the voltage does not exceed 42,4 V;9 q h% ^' o D/ a1 `' `
• for d.c., the voltage does not exceed 42,4 V;
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– the part is separated from live parts by protective impedance.- f" s8 @9 C8 \" g& r' i
If protective impedance is used, the current between the part and the supply source shall" D! d) n( e& f% F9 l; x% D2 b
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
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6 \& }, p* ]+ g: a) X- Y9 X* L22.27 Parts connected by protective impedance shall be separated by double insulation; ]8 Z0 Q* q: M
or reinforced insulation.9 g+ y. l( x( `1 l9 F' C
8 f7 A- X4 ?+ t22.42 Protective impedance shall consist of at least two separate components. If any one
4 B5 C, J5 |- A, |9 [9 L. ?of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not' n: l& t. R* O
be exceeded.# | f+ c8 q+ d( ]1 g
C {# D2 n: m. c% \Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the# A% G7 c4 P$ d8 O: K% |
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the$ l: Q; Z0 K& X8 K5 @" c
appliance.& J+ l" h @% @% s
( W2 u- | k6 y5 [$ m# F5 d这个结构想做保护阻抗是没可能的,8.1.4后面有要求没贴全,楼主可以看看。 |
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