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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
* a1 q: m5 m: l* Z! Aprotective impedance5 x; h2 ^$ S" W4 M q# X1 t
impedance connected between live parts and accessible conductive parts of class II
1 x1 C/ ^. m0 l! V# q, c! t% Bconstructions so that the current, in normal use and under likely fault conditions in the% ^8 K2 Z. k @
appliance, is limited to a safe value
+ A% B7 l5 l2 @: Y
( L& @# b2 ]* V6 v22.42 Protective impedance shall consist of at least two separate components. If any one
' x7 C: b" M0 ~of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
0 D/ ?, D1 C% ~8 t9 n4 Wbe exceeded.( K. j/ O2 v1 L2 J0 u
Component impedances shall be unlikely to change significantly during the lifetime of the
c8 ~. _$ T+ D' ?3 B4 m+ ~appliance.
+ W( l' V' f! T, K1 G2 j" GCompliance is checked by inspection and by measurement and if necessary, for resistors and
% x. d2 t7 ^2 scapacitors by the following tests.
' [) g- `3 N! T0 t2 v& L3 VResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the7 `7 d4 k L* P
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the u0 |3 K0 J/ c. _
appliance. |
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发表于 2012-11-5 17:58
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