The paper demonstrates the authors' understanding of the regulations about electricity leakage fire alarm system in the national standards,and describes the application of system design and main technical parameters of this system.

This paper analyzed the protection principle of all kinds of electricity leakage relays used in coal mine and their merits and shortcomings,then put forward a comprehensive scheme of electricity lea-(kage) protection used in underground.

The paper introduces fire danger by electricity leakage of low-voltage distribution system, analyzes the causes of the fire disaster due to the leakage and gives out the protective measures.

Talking about underground leakage causes and preventive measures;

on the basis of analyzing and researching the reason of the current leakage with the underground D.

And analysis is made on the leakage of the DC 600 V power supply system.

Cascading electric leakage fire warning system based on CAN bus;

Study on Electric Leakage and Electric Leakage Protective Instrument;

The viewpoint of the electric leakage protect in low-pressure electric wire;

In the light of the cause of electrical fire, the paper emphasizes the necessity of installing protective unit to prevent the leakage of electricity.

In accordance with the role of leakage of electricity protective device in capital construction, the classes, development procedure, and working principle of leakage of electricity protective device set forth.

Fire danger and technical preventive measures of creepage in low-voltage distribution system;

It tells about the tingling and creepage in one - way circuit equipment and analyses the cause of electrified outer covering (faradism、creepage) ,the difference of their normal and abnormal electrification,and ways to remove electrification in outer covering (meet cipher protect、earth protect).

It can improve the breakdown field and reliable performances, reduce and even remove the defections such as creepage, sparking,breakown and so on in working.