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这是标准条款，也不是Y电容都是保护阻抗的，要跨接可接触安全和危险部件间的
# u7 p5 w. ~- p2 V& wprotective impedance
3 @. _- ~2 _; b: w; K. Dimpedance connected between live parts and accessible conductive parts of class II
" _$ D6 L) P" A9 i6 g t% x8 B5 h3 ^constructions so that the current, in normal use and under likely fault conditions in the8 e7 l( J7 g0 Z% \: ^2 I
appliance, is limited to a safe value
0 F/ [6 | v" Q" j8 ~5 w% r3 s/ `- g+ @2 b: G9 C' Z( u
22.42 Protective impedance shall consist of at least two separate components. If any one
( n0 ^( Q; X3 G6 |1 a' Q" rof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not& N, y" m; w0 r' \+ n" b# c
be exceeded.# @8 ~( ~% d& _, m% o
Component impedances shall be unlikely to change significantly during the lifetime of the
% s5 W" t- {3 x* g; S7 x6 Qappliance.
3 L, w; w+ e" r# v& k+ VCompliance is checked by inspection and by measurement and if necessary, for resistors and' W9 {: a2 O+ T9 q! {- w8 N
capacitors by the following tests.
- W1 W/ q- u2 {& `) PResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
8 M' a. P, u. a) n9 Z' B' atests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the9 J; Y3 f/ }+ l% d+ o. [
appliance. |
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发表于 2012-11-5 17:58
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