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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8 s0 N7 Y! \) Y1 F0 q0 @/ m& V
protective impedance
5 I' D. D7 V3 S/ Ximpedance connected between live parts and accessible conductive parts of class II
! f) U. C1 ]4 sconstructions so that the current, in normal use and under likely fault conditions in the
; R+ A, W. m/ W: I. uappliance, is limited to a safe value
( ~2 S) ]6 _$ D
z7 E* B7 m- \; U22.42 Protective impedance shall consist of at least two separate components. If any one
3 F) Q8 {" h; o. N# wof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
6 _+ {# o! V3 D$ |3 M9 j) Kbe exceeded.
! q" l2 V5 ^4 E nComponent impedances shall be unlikely to change significantly during the lifetime of the
$ w6 z4 m) j8 ?( _) eappliance.0 o+ L9 k+ z* B4 f- |
Compliance is checked by inspection and by measurement and if necessary, for resistors and
' x; b( I. p0 y. V. g+ C, tcapacitors by the following tests.8 O: i+ a" e9 W, j8 O8 f1 t% V4 m
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
! R+ \& W: g" J4 T4 J6 A( otests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the5 i+ ^5 k! t6 w' h) X g; g4 V* u! j
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