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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: u& o8 |6 @ Z' S" |& Z
protective impedance
( T: I' s2 F7 a1 A: t. }impedance connected between live parts and accessible conductive parts of class II% t+ M+ `# G- I
constructions so that the current, in normal use and under likely fault conditions in the
( j/ Z; w3 Z4 bappliance, is limited to a safe value
! k% u; D+ M$ M& g) h7 q; [+ i" _/ _+ z
22.42 Protective impedance shall consist of at least two separate components. If any one
8 L7 _. F8 z) {- T" U+ e% G$ Uof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not6 [, K w k# a$ b
be exceeded.( S, t9 h. P: O5 ^. n
Component impedances shall be unlikely to change significantly during the lifetime of the8 I- f5 D4 Q* ^& F( @* n5 B
appliance.8 u$ Z% s- i/ h; R2 |3 P: a
Compliance is checked by inspection and by measurement and if necessary, for resistors and
; H# V/ P% D# O/ t; y2 h7 fcapacitors by the following tests.1 V9 }0 O5 A" U2 [" }6 n. G
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the: m" T& R$ k, K' H8 E3 g" Z
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the0 A" i4 M; |: F6 X; B& e+ M0 A) d
appliance. |
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发表于 2012-11-5 17:58
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