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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
( F" a0 t5 R4 H. O# H/ [9 `protective impedance
& z* D0 Z: m' M! A; N$ x) Q/ ]. bimpedance connected between live parts and accessible conductive parts of class II3 P. L' v2 p9 K6 r; ]" K
constructions so that the current, in normal use and under likely fault conditions in the' Y }+ D8 C) I x! y2 g
appliance, is limited to a safe value
3 [, R1 X) p, o3 l3 J
% {& X8 l7 d, X6 s3 R22.42 Protective impedance shall consist of at least two separate components. If any one7 P! J" y$ r) z
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not7 _4 H/ ~! V V" J4 E) f9 O
be exceeded.7 f3 e9 e5 ^4 R1 k
Component impedances shall be unlikely to change significantly during the lifetime of the1 v4 I1 c3 A; m
appliance.
, ^7 r3 N: Z0 b. g5 |* a: hCompliance is checked by inspection and by measurement and if necessary, for resistors and
/ W! L7 V4 H7 z7 hcapacitors by the following tests.
: X. g1 g& `) G$ m. u/ cResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
0 B0 }" j+ c: f. G* c% @2 Mtests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the+ D9 S `9 B9 N/ J
appliance. |
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发表于 2012-11-5 17:58
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