dead front 是正面安全型。这个是写在IEC61439-1里面的。描述如下:
3.3 External design of ASSEMBLIES
3.3.1
open-type ASSEMBLY
ASSEMBLY consisting of a structure which supports the electrical equipment, the live parts of
the electrical equipment being accessible
3.3.2
dead-front ASSEMBLY
open-type ASSEMBLY with a front cover; live parts may be accessible from directions other
than the front
简单的说就是前面操作的话碰不到带电部分啦。认真的说,几乎我们用的所有一般配电板都是dead front design。不复杂!