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发表于 2011-4-13 15:29
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yuqijun 兄弟,首先放电管肯定是满足不了基本绝缘的,就算是MOV挂接在PE上,也是有要求的,不是所有的设备都可以的。见标准如下:
2 O4 {2 b+ {6 M. v& n9 a* ^Equipment with such a VDR bridging BASIC INSULATION shall be one of the following:
/ M! }3 u) R" ~2 B− PLUGGABLE EQUIPMENT TYPE B; or
P. O8 ]. R& _4 p− PERMANENTLY CONNECTED EQUIPMENT; or- R# f, g( }. S( \/ j3 A8 W$ M- o& O/ ]
− equipment that has provision for a permanently connected PROTECTIVE EARTHING
7 N E/ U1 r# }* ~0 x! qCONDUCTOR and is provided with instructions for the installation of that conductor.* `6 t, |: f& g$ I
NOTE In Finland, Norway and Sweden, the third dashed item is applicable only to equipment as defined in the
2 Z" G2 V! I% D5 h; p* |Note to 6.1.2.2.
9 I! k) U' U# y# Q9 I8 b, ~% X: wCompliance is checked by inspection.4 s* m0 ~, Y' b
也就是说你的产品要是那三个类型的其中之一,才可以用MOV接在PE上,否则是不行的,标准里面有明文规定。但目前机构内部自己做了一个协议,如果产品不是那三种类型的,可以用MOV和放电管串联,当然还有热保险,这样可以接到PE. |
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