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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
D2 z. e5 B+ H9 V hprotective impedance
# O; E8 K" @2 L- u+ N& k$ g8 limpedance connected between live parts and accessible conductive parts of class II$ N) R7 M9 E3 Z* i
constructions so that the current, in normal use and under likely fault conditions in the9 u E) _8 \. A
appliance, is limited to a safe value
0 A# `/ n! h8 a0 Q7 z' n: Z1 o& }6 j/ E9 K# c' N. j2 P5 L
22.42 Protective impedance shall consist of at least two separate components. If any one
/ c9 [" k( s# Q3 i/ Y4 M5 eof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
7 q3 j- `% V8 Sbe exceeded.' L, ?4 ^" g! ~! H6 K( |# g
Component impedances shall be unlikely to change significantly during the lifetime of the
7 M: t$ ]* W4 Q0 Eappliance.
* A+ b' ~5 v. S* z5 Q8 NCompliance is checked by inspection and by measurement and if necessary, for resistors and
5 K% E& ~% N: k3 D4 ~capacitors by the following tests.$ K4 [# q7 `! Y/ I1 I- ~$ O, l
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the& j) g7 K; A: J7 ?/ d
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
! Y& I: k" w6 y6 Y4 Dappliance. |
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发表于 2012-11-5 17:58
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