CLASS III类产品的过电压等级如何确定？

jia_suwei

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我们有一个产品是CLASSIII类产品，过电压等级确定为II类，我想知道这个是如何确定的？既然是二类是不是说明该产品有触电危险？
恳请各位师傅告知！
& g; Z. m0 h, H: }+ h! ~) F

zqwb2011

3.3.10
- K3 i; [& [7 b9 ]class II appliance
appliance in which protection against electric shock does not rely on basic insulation only
but in which additional safety precautions are provided, such as double insulation or
6 V1 h# M2 l! }. G$ m0 X) b1 jreinforced insulation, there being no provision for protective earthing or reliance upon
installation conditions
, n- b6 F8 F( ~5 A* r1 `  X5 WNOTE 1 Such an appliance may be of one of the following types:
– an appliance having a durable and substantially continuous enclosure of insulating material which envelops all
metal parts, with the exception of parts, such as nameplates, screws and rivets, which are isolated from live
parts by insulation at least equivalent to reinforced insulation; such an appliance is called an insulationencased
class II appliance;
/ z3 B% _' h; q; g" V– an appliance having a substantially continuous metal enclosure, in which double insulation or reinforced
' D9 V5 b  w" s% ?* C1 Vinsulation is used throughout; such an appliance is called a metal-encased class II appliance;
– an appliance which is a combination of an insulation-encased class II appliance and a metal-encased class II
appliance.
NOTE 2 The enclosure of an insulation-encased class II appliance may form a part or the whole of the
supplementary insulation or of the reinforced insulation.
NOTE 3 If an appliance with double insulation or reinforced insulation throughout has provision for earthing, it
& k' l+ n7 n% q- m1 t4 a0 fis considered to be a class I appliance or a class 0I appliance.

ywg1011

所谓的二类设备是指：防电击保护不仅依靠基本绝缘，而且还采取附加安全保护措施的设备（例如采用双重绝缘或加强绝缘的设备），这类设备既不依靠保护接地，也不依靠安装条件的保护措施。
9 W" Z' P1 i+ b) t8 _5 Y3 Z
看你的设备是不是满足以上条件

ywg1011

而三类设备是指：防电击保护是靠安全特低压电路供电来实现的，且不会产生危险电压的设备

ywg1011

把你的产品按照这些条件去套就OK啦

jia_suwei

ywg1011 发表于 2011-12-22 09:29
所谓的二类设备是指：防电击保护不仅依靠基本绝缘，而且还采取附加安全保护措施的设备（例如采用双重绝缘或 ...

兄弟我是三类设备。。。。。

jia_suwei

zqwb2011 发表于 2011-12-22 09:29
& N7 I% v/ [) C# t5 }3.3.10
- f! V) H2 Q) w7 m" xclass II appliance
$ s; T$ {# m# d4 }4 G  I( r6 ]* ~appliance in which protection against electric shock does not rely on ba ...

标准我也有，请看下我问的内容，谢谢。

jia_suwei

ywg1011 发表于 2011-12-22 09:32
) W0 D3 l  w9 b  p  A+ W* U+ n& {而三类设备是指：防电击保护是靠安全特低压电路供电来实现的，且不会产生危险电压的设备

这个我知道，我想问的是过电压等级是如何确定。过电压等级不是考虑产品内部或者外部产生的瞬态高压对产品的影响吗？既然是过电压等级II，那就说明有产生瞬态高压的可能，那为什么不会产生危险电压？

ywg1011

jia_suwei 发表于 2011-12-22 09:43
- T) {* s7 e! _. v- j这个我知道，我想问的是过电压等级是如何确定。过电压等级不是考虑产品内部或者外部产生的瞬态高压对产品 ...

$ n; D; ?6 \* j4 S, q% B0 R- E瞬态高压也不一定是危险电压啊，比如ESD

ywg1011

你都判别式三类设备了，怎么会产生危险电压？？？？