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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9 r8 y1 \7 _4 t5 I# B6 l1 g
protective impedance
1 J/ z& T( f2 l3 j' a6 r, qimpedance connected between live parts and accessible conductive parts of class II
$ M# V2 `! U" i" u* ?" s% x0 econstructions so that the current, in normal use and under likely fault conditions in the
; `: A8 ?6 @- C" j, mappliance, is limited to a safe value
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/ N; A% O1 n* y3 B' J4 D22.42 Protective impedance shall consist of at least two separate components. If any one
$ k' S& c! s; x! ]* [of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
$ f8 P3 \2 P \, c6 m9 Xbe exceeded.) W5 z% y" ^3 G
Component impedances shall be unlikely to change significantly during the lifetime of the
. L- K% y9 K* C: G' w7 jappliance.+ B, I2 ?6 J8 J6 Z. T
Compliance is checked by inspection and by measurement and if necessary, for resistors and
. f- A$ M& H! I* Scapacitors by the following tests.$ s; X: {7 O; a5 G
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
4 A1 U) E9 y$ p3 U+ ~/ itests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the4 t6 ]1 l2 Y5 u/ W8 ]% D4 H
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