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续上:3 Y5 d" i+ M2 ~0 M# U/ ?
在IEC60335-1:2006中的第3.36中提出定义:! [+ ^5 T) n& }" U9 f
Protective 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。: V) K/ t' @1 W+ I" b: S! S3 r2 C
Clause 8.1.4:An accessible part is not considered to be live if :) A0 u9 @! m9 w: z1 R
-the part is supplied at safety extra-low voltage, provided that
4 I) ?- ?' a5 M J*for a.c., the peak value of the voltage does not exceed 42.4V: t% Q1 b$ k) M( n) e
*for d.c., the voltage does not exceed 42.4, or
3 a# V4 e1 B9 @7 E7 qthe 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。& ^* ]2 G C+ y) [& w! D
60335-1:clause13.1:在进行试验前断开保护阻抗和无线电干扰滤波器。
+ x1 `* U% z5 I1 `60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。
% Q8 C" ^6 d( W# m' X* w60335-1:clause19.11:任何流过保护阻抗的电流都不应超过规定的限值。
- |# M3 C! P C x/ K4 V60335-1: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。
0 f# M% n# f W/ K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。# }, M2 a2 R4 v% r" N& X5 U+ ?9 R
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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