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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 T' v3 x) g4 V4 U6 ]* a! ^0 U
protective impedance
0 A/ b. f8 x, B5 V" V7 C: cimpedance connected between live parts and accessible conductive parts of class II* Y' c. W# H. ^3 h! z
constructions so that the current, in normal use and under likely fault conditions in the. P$ y: H( r' R3 V! l
appliance, is limited to a safe value
5 F, `6 c* Z! U# r5 n$ O% Y% _) w! A& B: u
& ~$ B0 h7 A( k) o% z5 y22.42 Protective impedance shall consist of at least two separate components. If any one
0 l, ^& N7 l; ~% Q9 h" l7 Wof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
1 m6 U/ y8 A/ Y5 F# h+ Q: X0 o$ Wbe exceeded.
, ~. E0 [7 O- jComponent impedances shall be unlikely to change significantly during the lifetime of the
) m% W$ H9 y, R5 R+ Wappliance.4 `" l4 w( e/ Q6 z" v4 @
Compliance is checked by inspection and by measurement and if necessary, for resistors and
: F8 y3 q0 T- L9 H7 Scapacitors by the following tests., _6 O _& W1 S' v! l3 n
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the& L* p& ^8 {; A3 u
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the- D3 F. `$ p' o- O/ y) h r2 L8 _ C
appliance. |
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发表于 2012-11-5 17:58
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