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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
4 \5 b, s! v' z1 T6 r* [ mprotective impedance
1 R1 y% m- \1 dimpedance connected between live parts and accessible conductive parts of class II
' L7 q1 u0 O8 g' Iconstructions so that the current, in normal use and under likely fault conditions in the6 `; b* P: X2 |1 w
appliance, is limited to a safe value
% k1 y! g6 t" ]% R
% H. h$ l+ @& ]: z. z: P! E5 E22.42 Protective impedance shall consist of at least two separate components. If any one
3 \. a; k9 ^) w% G, b/ ]of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
0 Z8 o U2 b2 H; O9 O( t7 hbe exceeded.
- m5 Y# [& ~9 TComponent impedances shall be unlikely to change significantly during the lifetime of the# N! n* \/ g! [( c* r
appliance.$ f2 I( L. n# x, `2 x& w
Compliance is checked by inspection and by measurement and if necessary, for resistors and H; z0 O6 U; h- m% k q- u
capacitors by the following tests.
; B( x7 \2 X$ ~6 O& ]Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the: t1 j3 i3 x: x [) a* T6 X& U
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
2 A7 {$ B8 A5 S1 Gappliance. |
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发表于 2012-11-5 17:58
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