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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
6 m" @' N' T: U! D9 b6 ]+ c- `% }: ~protective impedance' F' m) Z: S B& N6 r
impedance connected between live parts and accessible conductive parts of class II
# I0 d! Z5 d* J/ U8 Lconstructions so that the current, in normal use and under likely fault conditions in the; T' s) Z5 H+ o% \ G7 a! I
appliance, is limited to a safe value
# ~% c$ m, n% H7 C+ X) X' [/ ?+ J3 {
22.42 Protective impedance shall consist of at least two separate components. If any one
! J0 ?' L/ N, w: d7 w7 b' R0 t. W0 zof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not' |2 p9 C8 s/ ?; I7 j
be exceeded.
6 x. d* M( ?! a! ^0 y6 LComponent impedances shall be unlikely to change significantly during the lifetime of the
7 r& ?9 f# q" U( g% Jappliance.
; j, l9 p9 S6 V7 [. R* lCompliance is checked by inspection and by measurement and if necessary, for resistors and3 K+ k7 \: l- V; v6 v9 S9 X# l, G
capacitors by the following tests.8 @* b6 t4 ] L6 g/ o7 _( M! Y
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the/ ^2 R5 e0 `! y6 W5 D
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the, |1 w8 l" `9 N) ^3 O8 a
appliance. |
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发表于 2012-11-5 17:58
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