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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' N; U" A8 Y5 c3 b( O
protective impedance1 C, `2 V% ~$ q- O
impedance connected between live parts and accessible conductive parts of class II
# w0 E5 B+ `( ?, A u5 z0 R1 [constructions so that the current, in normal use and under likely fault conditions in the
% X# a5 \8 Z! R( e! Fappliance, is limited to a safe value
# l8 W3 j2 _. o' D, _6 q3 o+ M+ C6 ^, o. K5 }8 T
22.42 Protective impedance shall consist of at least two separate components. If any one3 m0 t* @! Y- \6 u, h+ ~
of the components is short-circuited or open-circuited, the values specified in 8.1.4 shall not3 C: { G7 W; G- v; r
be exceeded.1 ? [' I) J, H. f1 x
Component impedances shall be unlikely to change significantly during the lifetime of the
4 w$ V4 f: \1 c" a- p$ l( [appliance.
! O7 V1 j, G5 `" X0 Q0 r( ~9 wCompliance is checked by inspection and by measurement and if necessary, for resistors and
# }5 \2 R. ^$ g, x" h9 ^6 wcapacitors by the following tests.
; w/ w d5 m. `7 ?0 vResistors are checked by the test of 14.1 a) in IEC 60065 and capacitors are checked by the
/ D5 n7 [- R6 s: Z# otests for class Y capacitors in IEC 60384-14 appropriate to the rated voltage of the9 P D' m$ j9 g3 y, \; A
appliance. |
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发表于 2012-11-5 17:58
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