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本帖最后由 craigyu 于 2014-8-4 18:08 编辑 0 }4 `4 f. G+ K, T4 H, B
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3.3.6
( K3 S/ n. v- B! V" bprotective impedance
' j$ E! Z* Z7 t1 d$ {5 ^9 }- aimpedance connected between live parts and accessible conductive parts of class II
`0 _4 G8 h3 i3 t3 [constructions so that the current, in normal use and under likely fault conditions in the
l' n7 o: ?: A' N1 A$ a2 o! Cappliance, is limited to a safe value
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" z) e8 f# b- z& x1 ~8.1.4 An accessible part is not considered to be live if U E$ s" I I8 F
– the part is supplied at safety extra-low voltage, provided that
4 y Q& Y9 k6 A. Y0 y1 s, n! @• for a.c., the peak value of the voltage does not exceed 42,4 V;
% J( |. z. _! o• for d.c., the voltage does not exceed 42,4 V;* ]% \& ]7 i: J4 E" ]* c
or) [" r1 S7 G8 k. h+ R" H+ Y
– the part is separated from live parts by protective impedance.
! s! G, p; k3 W$ k8 rIf protective impedance is used, the current between the part and the supply source shall
' p" R' E/ k) k7 s9 e0 |not exceed 2 mA for d.c., its peak value shall not exceed 0,7 mA for a.c. and* e. s$ g4 L& [ i0 A) x7 s
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22.27 Parts connected by protective impedance shall be separated by double insulation" B, {2 F, g6 b: V! y
or reinforced insulation.
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22.42 Protective impedance shall consist of at least two separate components. If any one
: y6 X4 Y P" G* _2 hof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
+ W5 i5 I. ]( L! v% t1 C l, Obe exceeded.
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Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
% }4 D* b( R* b1 `! \tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
. y. W Y) p3 ` `8 g3 u& ^appliance.; k% \( }" A4 q" g- V
% |5 N% o& G* W" L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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