让梦飞翔 发表于 2012-8-31 11:11

安全特低电压部分的材料对耐燃是否有要求?

GB47.6.1标准 30.2.3.1章中指出“支撑正常工作期间载流超过0.2A的连接件的绝缘材料部件,以及距这些连接处3mm范围内的绝缘材料,其灼热丝的燃烧指数至少为850……”,在这里只是对电流的范围有要求,而没有对电压作要求。那么,在安全特低电压部分,与超过0.2A载流体相距3mm以内的绝缘材料是否也要达到850的燃烧指数?

山炮 发表于 2012-8-31 13:28

是的,不管电压大小。

让梦飞翔 发表于 2012-8-31 14:46

山炮 发表于 2012-8-31 13:28 static/image/common/back.gif
是的,不管电压大小。

那就是说,开关电源板安全隔离后的输出电压是34伏,带25W的负载,PCB线路中的电流大概是0.7A。距离此PCB线路(铜箔)3mm内的注塑件必须要通过850度的灼热丝试验?

craigyu 发表于 2012-8-31 14:49

可能引起着火的是电流产生的发热,与电压无关。

让梦飞翔 发表于 2012-8-31 15:00

谢谢各位!

山炮 发表于 2012-8-31 15:03

本帖最后由 山炮 于 2012-8-31 15:04 编辑

让梦飞翔 发表于 2012-8-31 14:46 static/image/common/back.gif
那就是说,开关电源板安全隔离后的输出电压是34伏,带25W的负载,PCB线路中的电流大概是0.7A。距离此PCB线 ...
注意豁免条件!!!注意什么叫3mm!!!

让梦飞翔 发表于 2012-8-31 17:00

山炮 发表于 2012-8-31 15:03 static/image/common/back.gif
注意豁免条件!!!注意什么叫3mm!!!

我不太明白您的意思???实际就是,铜箔导线的实际载流超过了0.2A,而距铜箔(或元件引脚)3mm以内的外壳非金属材料。

craigyu 发表于 2012-8-31 17:04

请看标准和图O.5
The glow-wire test of IEC 60695-2-11 is not applicable to:
– hand-held appliances;
– appliances that have to be kept switched on by hand or foot;
– appliances that are continuously loaded by hand;
– parts supporting welded connections and parts within a distance of 3 mm of these
connections;
– parts supporting connections in low-power circuits described in 19.11.1 and parts within a
distance of 3 mm of these connections;
– soldered connections on printed circuit boards and parts within a distance of 3 mm of
these connections;
– connections on small components on printed circuit boards, such as diodes, transistors,
resistors, inductors, integrated circuits and capacitors not directly connected to the supply
mains, and parts within a distance of 3 mm of these connections.
NOTE 6 Some applications of the term "within a distance of 3 mm" are shown in Figures O.5.

让梦飞翔 发表于 2012-9-17 17:16

听说IEC60335-1:2012对三类结构绝缘材料的耐燃问题有明确的标准。你们有IEC 60335-1:2012的标准吗?
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