讨论:EN60950-1:2006 顶部开孔问题
在4.6.2章节中有如下内容:Compliance is checked by inspection and measurement. Except for that portion of the side of
a FIRE ENCLOSURE that is subject to the requirements of 4.6.2 (see above paragraph), any one
of the following is considered to satisfy the requirements (other constructions are not
excluded):
− openings that do not exceed 5 mm in any dimension;
− openings that do not exceed 1 mm in width regardless of length;
− top openings in which vertical entry is prevented (see Figure 4B for examples);
− side openings provided with louvres that are shaped to deflect outwards an external
vertically falling object (see Figure 4C for examples);
− top or side openings, as shown in Figure 4D, that are not located vertically, or within a
volume V bounded by a 5° vertical projection up to the size of opening L, above bare
conductive parts:
• at HAZARDOUS VOLTAGE, or
• that present an energy hazard within the meaning of 2.1.1.5.
NOTE 2 The examples of Figures 4B, 4C, 4D and 4E are not intended to be used as engineering drawings but are only shown to illustrate the intent of these requirements.
我的个人理解是,顶部开孔除了要满足尺寸要求外,孔下面还要有东西挡着,不能垂直或者5度角投影直接投到危险带电体上。 希望我的看法可以抛砖引玉,可以引来大家更深的讨论。 我是这样理解 的:
标准上说顶部开孔只要满足其中一条就认为满足要求,满足尺寸要求就是可以 的,那么就不用考虑5度角的问题;
如果开孔尺寸不满足要求,那么就要在5度角范围内不能有危险带电体
不知这样理解对否 any one of the following is considered to satisfy the requirements ,看来还是any one of 这个词组有玄机啊,应该也只是其中一个满足即可了。国标里面是这样翻译的:如下的任一条均认为满足要求。好像确实是只要满足其中一条即可。 只要满足一条就可以的 个人认为只要满足其中一个条件即可 这个是只要满足其中任何一条就OK, 并且开孔要看你的产品是不是TRANSPORTABLE EQUIPMENT, 若是的话,请看如下:
4.6 Openings in enclosures
NOTE 1 Subclauses 4.6.1 and 4.6.2 do not apply to TRANSPORTABLE EQUIPMENT.
Subclause 4.6.4 applies toTRANSPORTABLE EQUIPMENT only. 引用第1楼ye_lin86于2011-03-31 10:25发表的:
我是这样理解 的:
标准上说顶部开孔只要满足其中一条就认为满足要求,满足尺寸要求就是可以 的,那么就不用考虑5度角的问题;
如果开孔尺寸不满足要求,那么就要在5度角范围内不能有危险带电体
.......
5度角是说的侧孔。 投影也是适用。 那我就不明白了,如果说只满足其中一条就可以,那么假如侧面开孔满足5度角范围的要求,顶部开孔很大(大于5MM,或结构也不符合),这样也可以吗? 引用第8楼被爱遗忘的人于2011-04-02 08:26发表的:
那我就不明白了,如果说只满足其中一条就可以,那么假如侧面开孔满足5度角范围的要求,顶部开孔很大(大于5MM,或结构也不符合),这样也可以吗?
你搞混淆了。是顶部,侧面,底部分别具有不同的适合选项,只要满足其中一个条件就好。
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