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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) Z! O+ j U! g
protective impedance
5 k2 H* I" a S0 V6 @/ wimpedance connected between live parts and accessible conductive parts of class II
4 z$ `3 ^: i5 l# _constructions so that the current, in normal use and under likely fault conditions in the
* G+ Y: e9 s2 ?2 q# tappliance, is limited to a safe value
& A" U% k4 i. j' g% L# v- ^0 d3 V* Y1 c% _2 O; D$ V
22.42 Protective impedance shall consist of at least two separate components. If any one
, J9 m3 F( F+ fof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not! u# }2 T7 i0 X& k. Y! L
be exceeded.! n- I1 c; A4 @1 w( S' n
Component impedances shall be unlikely to change significantly during the lifetime of the
! U2 i% _6 {% Y+ fappliance.8 g6 R3 r. A) |+ S4 b
Compliance is checked by inspection and by measurement and if necessary, for resistors and& S6 |4 }9 G1 L' f# W9 }: ?0 b/ P
capacitors by the following tests.
; `0 s" T( d. g" l* \Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the: t, D% P- L, |+ N; u0 v7 S( H- @
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the4 ^. N, E) O0 o, [% g
appliance. |
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