|
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
, [& t, s- Z5 _+ V" Cprotective impedance
* @$ n6 U" z1 R5 E, himpedance connected between live parts and accessible conductive parts of class II
. X/ z/ ~0 Q2 d8 {constructions so that the current, in normal use and under likely fault conditions in the
2 k5 f% q; g* @3 Tappliance, is limited to a safe value
5 ~. j2 H4 |# Z# C
5 Z/ |5 f! ?0 ^! c& F* y22.42 Protective impedance shall consist of at least two separate components. If any one
& g7 V6 u3 p- o9 }: H Bof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not8 a1 C2 `* z9 ?4 @8 z
be exceeded.4 j4 z- g! D w# W, v& _) a; j7 R
Component impedances shall be unlikely to change significantly during the lifetime of the
9 o+ v. D$ B' J6 ~$ \0 S1 |appliance.
/ ?8 H: A3 v R+ q# z1 k: s' hCompliance is checked by inspection and by measurement and if necessary, for resistors and
9 P2 _0 Q, Q1 Z. @# c5 ]! Jcapacitors by the following tests./ e; y2 a% ~. h" f
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the( A& p/ F4 B! ^
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the9 q5 R9 q" X4 E D( P
appliance. |
|