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本帖最后由 craigyu 于 2014-8-4 18:08 编辑
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$ \5 s1 v) m8 _, ~1 ^* Q; u/ D) F3.3.6
7 {1 a. o) F- |& m- Gprotective impedance
. d- R; q: |6 D3 p, gimpedance connected between live parts and accessible conductive parts of class II
1 S( X5 @) d- d! k* E5 iconstructions so that the current, in normal use and under likely fault conditions in the6 N' K8 X4 X, j% y
appliance, is limited to a safe value
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$ j: y" H4 P, j0 t, U1 k6 h* l' v8.1.4 An accessible part is not considered to be live if
* X, X$ [ D" T: g, {– the part is supplied at safety extra-low voltage, provided that
1 d- ~# `1 n; w' B/ {- G7 x6 D' P• for a.c., the peak value of the voltage does not exceed 42,4 V;
! \& v9 ]- o) h% F$ ~• for d.c., the voltage does not exceed 42,4 V;
* ^4 S: k. f& U5 |) Y, w! W: t# \or3 ^# {+ k c% m5 ~, v$ x
– the part is separated from live parts by protective impedance.2 Z$ k8 {+ Z. W) J, B( b, D
If protective impedance is used, the current between the part and the supply source shall- f# g: W9 Y5 U/ c' q
not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and
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0 f: k2 b8 Y/ Y5 B2 i22.27 Parts connected by protective impedance shall be separated by double insulation
4 r& s, F( K) z% n$ F1 n/ { s" tor reinforced insulation.* }& x9 Q' h+ E) S8 U
1 K% J" n# w+ Y4 X
22.42 Protective impedance shall consist of at least two separate components. If any one9 h, G: z; {' K) y6 i
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
[% ^; G5 W$ r( v# Kbe exceeded.. C7 _2 _+ A, `5 k1 p
! ]* h3 m* J) U; b' s4 ?
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
' U4 u! {, z- rtests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
+ \9 h1 y$ |( n wappliance.8 x/ `4 @0 o9 T; V
2 c6 U9 Y7 w/ v3 T) W( q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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