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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7 m# L1 V6 P7 G' @
protective impedance5 y. K/ _1 o2 J+ u; g( J/ p
impedance connected between live parts and accessible conductive parts of class II
8 t. L/ t7 g8 F4 iconstructions so that the current, in normal use and under likely fault conditions in the/ \) B4 k% b7 a% G
appliance, is limited to a safe value5 o, E' X# C3 d) K |
+ \! _ L1 g4 O A: w
22.42 Protective impedance shall consist of at least two separate components. If any one
3 j: E, u' M9 L4 ^0 nof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
0 l& L( J- `7 Ibe exceeded.
6 ^% X7 X7 k4 Q" eComponent impedances shall be unlikely to change significantly during the lifetime of the; h$ Y5 v/ O! A( p7 A: P
appliance.
" [5 v, i U; s. |, M% U0 c8 FCompliance is checked by inspection and by measurement and if necessary, for resistors and, t" i- {/ @' j* {- d- f' M2 d( i
capacitors by the following tests.5 i, @% i3 b& Q0 V
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the0 [) @ l( i. c' R6 i
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
2 T8 O, |! Z2 ~1 I- Z7 l# E1 Pappliance. |
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发表于 2012-11-5 17:58
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