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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
5 j8 l0 F/ T0 { B% G( aprotective impedance
8 z% K9 W* |4 Q9 \/ z, ?impedance connected between live parts and accessible conductive parts of class II' Z5 F) V7 r4 ]0 W
constructions so that the current, in normal use and under likely fault conditions in the: B1 w: f& M3 l, m# g8 b
appliance, is limited to a safe value( V( G/ M3 j( `+ E
$ \; o, ]; E; H4 S! {
22.42 Protective impedance shall consist of at least two separate components. If any one
6 E# S* H- M" Z& |4 x6 zof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not3 s M# ]) ?, C* [8 Y7 v6 l
be exceeded.& D9 M. C6 W6 a
Component impedances shall be unlikely to change significantly during the lifetime of the% m0 H4 F1 C" ]6 w( o5 p/ ? v
appliance.# d/ W4 _: s/ @
Compliance is checked by inspection and by measurement and if necessary, for resistors and
/ w5 W" k. D' n, o& \# Wcapacitors by the following tests.
( @/ T6 f; z+ g/ nResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the7 i# t; d4 ^! j. P% V
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the& V/ F/ e+ X6 y6 Q# G" y
appliance. |
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发表于 2012-11-5 17:58
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