Various problems often occur during the use of terminal blocks.
The problem of burning black
If the terminal block is black, one of the possibilities is not necessarily burning black, oxidation may also be black. So how to verify whether it is burnt black? The method we take is to wipe it with a finger. If it can be wiped off, like soot, it is a black substance formed by oxidation, and it can only be ground off with sandpaper or a file.
