标题: 65结构检查疑问(新手提问) [打印本页] 作者: 秋飘风叶 时间: 2008-1-15 11:22 标题: 65结构检查疑问(新手提问) 1, 污染等级怎么定义?(拿到一个样品,这个怎么定义呢?)8 ^ p1 g v% D
2, 翘板式和推推式开关不属于全极开关吗?# h3 _, U" l9 g9 G/ R t
3, 防火外壳的定义.(金属外壳算不算防火外壳,如果是塑料的,那怎么定义)3 I9 k! ^% S- R
& o- s% F) l9 `麻烦各位看看,谢谢!!!作者: 秋飘风叶 时间: 2008-1-15 14:53
怎么没人回答, 顶下.作者: zihui 时间: 2008-1-15 15:17
60950-1中：& ]- u' A- q3 D5 x) Y
Pollution degree 1 applies where there is no pollution or only dry, non-conductive pollution. the pollution has no influence.normally ,this is achieved by having components and subasssembilies adequately enclosed by enveloping or hermetic sealing so as to exclude dust and moistrue G/ }8 e- x* C* r' b i$ @" X- m- b0 z: r, M8 l% [) \' c; _
Pollution degree 2 applies where there is only non-conductive pollution that might temporatily become conductive due to occasional condensation. it is generally appropriate for equipment covered by the scope of this standard2 L' q4 P. o5 \+ c( \7 d% \
5 M4 W: d6 P. q+ DPollution degree 3 applies where a local environment within the equipment is subject to conductive pollution, or to dry non-conductive pollution that could become conductive due to expected condensation.作者: zihui 时间: 2008-1-15 15:45
金属肯定是防火外壳．一般产品金属外壳的温度肯定不会超过其熔点．防火外壳主要是针对塑料外壳而言．一般常见塑料外壳的防火可分为Ｖ－０，Ｖ－１，Ｖ－２，ＨＢ等级，Ｖ－０防火等级最好，ＨＢ等级最弱．如果是安全电路的产品外挂ＬＰＳ电源的话，选用ＨＢ等级的就可以了．但是电源通常就要选用Ｖ－０等级了． 9 H" r6 E/ @6 ]& l0 }" E1 F2 {ＰＣＢ板一般选用Ｖ－０等级．作者: 秋飘风叶 时间: 2008-1-15 16:10
谢谢zihui作者: 秋飘风叶 时间: 2008-1-17 11:02
全极开关的问题谁帮我回答下?作者: KOKO 时间: 2008-1-17 11:49
全極開關的理解應該為：L & N同進切斷， 翘板式種類開關有見過。作者: 秋飘风叶 时间: 2008-1-17 11:53
楼上意思说翘板式开关也有可能是全极开关吗?没见过作者: zhh0815 时间: 2008-1-17 11:58
主要是看开关结构的, 2种开关形式都可能作者: 雨过天晴 时间: 2008-11-19 23:16
多看看950作者: Roy0769 时间: 2008-11-20 10:05
翘板式开关出欧规是断正极,出英规是两极全断.所以,两种情况都有.