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续上:
- m& F; y0 a1 [6 z在IEC60335-1:2006中的第3.36中提出定义:. C i" ?* R" o$ T0 P
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。2 W g" n% R0 c; ]9 u7 g4 a% c3 _
Clause 8.1.4:An accessible part is not considered to be live if :
: q, X) k" U) x-the part is supplied at safety extra-low voltage, provided that
" w: f K2 y* W7 p*for a.c., the peak value of the voltage does not exceed 42.4V9 u. e/ F% i) |- I
*for d.c., the voltage does not exceed 42.4, or
; A2 N' O9 U# K, C% ythe 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。
; P$ G) s+ Q2 b r60335-1:clause13.1:在进行试验前断开保护阻抗和无线电干扰滤波器。' Z& h8 W% p! |
60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。
" I* ]( Q1 e* T6 z, }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。. m8 c$ s' x' w4 r- k
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。7 }2 t2 g+ q d: w) u3 x8 F
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。
4 I2 A9 c7 J, x9 Q! {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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