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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
' P4 ?, \# B8 h( n+ ?protective impedance% H. f' ]1 E0 o* T$ b. i( U0 i
impedance connected between live parts and accessible conductive parts of class II
& y; H% F0 F/ C- s* u& H, t, sconstructions so that the current, in normal use and under likely fault conditions in the- R- {2 I: |1 i3 F* h1 ?
appliance, is limited to a safe value5 s& o4 g; Z$ U" u) a6 I
+ Y7 A |$ c* _, n( J* o# f6 p22.42 Protective impedance shall consist of at least two separate components. If any one' J, K: ?. ~1 R0 i. S4 E
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
% [+ U$ d: J; l! u' L( @be exceeded.
0 g; x1 b" b1 F! N/ f. BComponent impedances shall be unlikely to change significantly during the lifetime of the
/ [2 ?7 U" E, h3 dappliance.: e, V8 l3 |1 u" ~' q. r% t
Compliance is checked by inspection and by measurement and if necessary, for resistors and
2 L! X/ z1 v1 X$ ocapacitors by the following tests.
) j4 O# h: y! E) L& gResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the+ `, T) \( k& ?! C4 F
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the
& L* a+ R1 g# ~; [6 k+ y5 rappliance. |
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发表于 2012-11-5 17:58
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