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续上:
, d$ {$ \ a/ z& p3 U在IEC60335-1:2006中的第3.36中提出定义:
3 M8 h* G: [( }* f& cProtective impedance: Connected between live parts and accessible conductive parts of Class2 constructions so that the current, in normal use and under likely fault conditions in the appliance, is limited to a safe value.连接在带电部件和2类结构的易触及导电部件之间的阻抗,在正常使用中及器具出现可能的故障状态时,它将电流限制在一个安全值。, g% i* h+ [9 X0 k( E3 f0 j
Clause 8.1.4:An accessible part is not considered to be live if :( Z; c# p# u7 b
-the part is supplied at safety extra-low voltage, provided that% {1 ~0 v5 a- @5 X1 T2 g- K; E
*for a.c., the peak value of the voltage does not exceed 42.4V: T! D! W E, I8 y4 T
*for d.c., the voltage does not exceed 42.4, or + P# ~( R/ S$ D3 C& V
the part is separated from live parts by protective impedance.以下是如有保护阻抗的情况下,它的电流限值,有时间自已去看看此条款。
( a' a$ c. d% D, q60335-1:clause13.1:在进行试验前断开保护阻抗和无线电干扰滤波器。. f: s) w0 `. @6 x
60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。& Y8 }0 L" p8 T0 y+ ^& g
60335-1:clause19.11:任何流过保护阻抗的电流都不应超过规定的限值。
" o% ?; Y7 u3 g+ B$ u+ l60335-1:clause22.27:应采用双重绝缘或加强绝缘将由保护阻抗连接的各个部件隔开。
+ W- R+ A, _% V在IEC60384-14:保护阻抗应至少由两个单独的元件组成,这些元件在阻抗在器具的寿命期间内不可能有明显的改变。
' b( k0 D* a$ M* i* P5 ~通过上面标准的引用,相信大家心里应该有答案了吧。 |
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