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续上: L; c- m3 N! S, _
在IEC60335-1:2006中的第3.36中提出定义: ^9 Y3 e1 c) W" _
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。; ^3 S4 p: x+ w2 u
Clause 8.1.4:An accessible part is not considered to be live if :
- d: }. K. K* K6 [-the part is supplied at safety extra-low voltage, provided that/ c' F& p$ t* }1 F; V& F
*for a.c., the peak value of the voltage does not exceed 42.4V0 u0 K) v$ Q! k" \" A( t
*for d.c., the voltage does not exceed 42.4, or 1 P0 V* F" f7 W4 D* A
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。
, N: w7 \/ {( `9 H60335-1:clause13.1:在进行试验前断开保护阻抗和无线电干扰滤波器。. G& K# F- \; I* p
60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。! S! s# U. g7 c% {9 X' d
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。; C; j9 V' I$ j8 x: H7 G# W
60335-1: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。: V) l0 f% m5 i
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。
1 x/ ^9 m# e1 f# t: {3 t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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