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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0 D3 x5 r3 f/ x9 C t
protective impedance0 K* ~5 k) x# I6 p" @. s' Q l
impedance connected between live parts and accessible conductive parts of class II
$ ?3 q. t2 t$ k3 a' iconstructions so that the current, in normal use and under likely fault conditions in the
5 ~" h8 X" {+ h) F2 ^4 O) M5 jappliance, is limited to a safe value
4 m/ F! I+ j5 r" M/ Z
, |9 n/ R3 Z5 N) n, \& ?1 i22.42 Protective impedance shall consist of at least two separate components. If any one2 T1 a: N) W4 J) ]5 m
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not2 c) J& n# K, B
be exceeded.$ [" j: H. l0 O9 A# N2 c
Component impedances shall be unlikely to change significantly during the lifetime of the: ]. u0 U# D, F8 N
appliance.$ q% d& N6 n9 e2 I& q! z: @
Compliance is checked by inspection and by measurement and if necessary, for resistors and
# E* f R) }/ n3 W; S; Z( }capacitors by the following tests." {# U' M# B# J! D; v
Resistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the( E# H z" Q# [/ k9 E+ Q
tests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the2 o' \4 q" ~- L* l4 `
appliance. |
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发表于 2012-11-5 17:58
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