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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
: u1 j9 ?) K! E. b4 Z3 s) Wprotective impedance
3 @* [5 ~, r7 t. L5 w/ \impedance connected between live parts and accessible conductive parts of class II
, w7 K$ }0 q* r7 j* a' Hconstructions so that the current, in normal use and under likely fault conditions in the
. E/ o( c1 }9 C F$ u" Bappliance, is limited to a safe value
. B4 _( `2 \, g5 t& M; _3 x: V4 S0 e" \
22.42 Protective impedance shall consist of at least two separate components. If any one
8 S4 ^! E2 M' ?0 gof the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not
) o1 s4 v/ Q, Dbe exceeded.# w; G" y9 r' ^, {1 c
Component impedances shall be unlikely to change significantly during the lifetime of the# J5 K) w* W d1 i5 C! G' G3 I& P5 \
appliance.% m5 V+ q ?# }( b
Compliance is checked by inspection and by measurement and if necessary, for resistors and
/ C- \) _" x8 h& j2 a: _2 @4 Tcapacitors by the following tests.
: R1 G) |! H0 E8 L% F# CResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
" H: B2 t1 j% F9 h3 R$ N2 Stests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the9 \% ~4 W' Z# ~& x$ j
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