PELV 电路

macro

既然PELV电路已经接地，为何还要与其他带电体达到加强或双重绝缘呢？

alofoy

家电里面有PELV?

方离

3.4.4
protective extra-low voltage circuit
earthed circuit operating at safety extra-low voltage which is separated from other circuits
by basic insulation and protective screening, double insulation or reinforced insulation
NOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.
NOTE 2 A protective extra-low voltage circuit is also known as a PELV circuit.

看定义，白的之所以叫白的，是我们把它定义成这样的。
其前提条件是SELV回路接地，也就是接地的SELV回路，SELV回路本身是和一次回路双重或加强绝缘隔离的。

macro

大侠，定义地球人都知道！
我问的就是为什么定义这么规定？
因为安规常识，接地+基本绝缘就OK了。