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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/ \5 M% a. c9 Y" Y& t2 q
protective impedance
. E/ X5 l+ o. W: S; g2 ]; O+ pimpedance connected between live parts and accessible conductive parts of class II
& M3 R7 M+ a! `) Q0 }) U* yconstructions so that the current, in normal use and under likely fault conditions in the U% k& Y) ?( N9 [4 g% b4 K5 h
appliance, is limited to a safe value+ s- S8 `4 k; y! y/ V" h$ u
) \1 G/ H' l5 R& ^) y3 ~22.42 Protective impedance shall consist of at least two separate components. If any one
6 h. [) u- E/ w' nof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
! D7 I$ e+ H- Z5 y/ p+ Q' ?be exceeded.
0 H ]: l4 b4 D+ C4 n: RComponent impedances shall be unlikely to change significantly during the lifetime of the
2 P1 I- e$ l" p; x3 R- Wappliance.' B. a1 `3 z1 f: ~
Compliance is checked by inspection and by measurement and if necessary, for resistors and
8 F9 D2 k. w6 c' m' Ocapacitors by the following tests.
2 @5 C! W1 i( F) }; X+ IResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
% C$ Q! U" T& Y4 M$ Ttests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the$ e2 C3 M5 {# _2 ]
appliance. |
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发表于 2012-11-5 17:58
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