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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! O+ h2 X" T; ?, C/ R
protective impedance
( R. H+ h; H" D! F/ g. Qimpedance connected between live parts and accessible conductive parts of class II
8 A- t% C$ c/ o8 H' W9 s4 Uconstructions so that the current, in normal use and under likely fault conditions in the
# N: E6 r1 z; t' J' Dappliance, is limited to a safe value( s0 r. N1 A/ N- s
+ S! h i M; M" z0 N22.42 Protective impedance shall consist of at least two separate components. If any one
' z- D& E* g" Sof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
1 B% B5 {7 N! l8 \3 lbe exceeded.8 B1 T0 x5 h2 X# Z5 z
Component impedances shall be unlikely to change significantly during the lifetime of the
" W6 [+ m P6 M! H% H8 C% pappliance.
- J! N# Z) N7 ?* ]" oCompliance is checked by inspection and by measurement and if necessary, for resistors and
6 @- B) v l! e" Ncapacitors by the following tests.1 A& I8 t" ~- w, D6 ^
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the5 B' `+ q; i$ T1 `0 B4 }5 V
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the6 _: }* X+ e0 J8 `: k, y
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