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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
/ L6 Z0 ?$ d+ i6 Q* o4 E6 Tprotective impedance4 j2 I1 |7 m2 }: N7 N0 l% v
impedance connected between live parts and accessible conductive parts of class II
- \/ ?: z1 W3 aconstructions so that the current, in normal use and under likely fault conditions in the/ `* u c" Y d0 r8 ^ x" L
appliance, is limited to a safe value
2 C! ^9 N+ P1 `5 K# c8 V( e# g& m5 r2 H; e/ m) [
22.42 Protective impedance shall consist of at least two separate components. If any one* [! X$ e, k) E: b
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not' {. r5 I. M9 ?+ k) z
be exceeded.3 P8 M3 ^4 k; R
Component impedances shall be unlikely to change significantly during the lifetime of the
- Q" K* x1 x) |, sappliance.
, b$ z8 |; x# Z) ?8 r4 MCompliance is checked by inspection and by measurement and if necessary, for resistors and: c( X3 m H9 E8 V1 A
capacitors by the following tests.8 s* h5 A" @5 S7 b( f) o" j
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the# |, r9 j& k- q
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
4 [) V4 @3 [! a |0 U: ~appliance. |
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发表于 2012-11-5 17:58
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