Misuse of leakage protector

Leakage protector is a kind of protective electric appliance which is more common in industrial and mining enterprises and households. Especially in hand-held power tools, it is more common. However, due to misuse and incorrect use, the leakage protector is in actual use. It does not have the protective effect it deserves. There are problems:

First, the selection is not appropriate, the leakage protector used to prevent electric shock should use high sensitivity and fast type, and the product of its action current and action time should not exceed 30mAs.

Second, the understanding is wrong, some users mistakenly believe that the hand-held power tool is equipped with a leakage protector, everything is gone, omitting the zero-connection protection, so that the protection appliance loses the leakage protection effect, only plays the role of electric shock protection.

Third, the use of non-standard, in the single-phase leakage protector in the protection of the zero line and the work zero line is not separated, leakage protection function is invalid, once the tool casing leakage, the short-circuit current will also burn the leakage protector; or protect the zero line and the working zero line Although it is separated, the ground end of the power socket is suspended, which is actually a false ground, so that the leakage protection still does not have the protection.