In the light of the cause of electrical fire, the paper emphasizes the necessity of installing protective unit to prevent the leakage of electricity.
2
煤矿井下漏电，不仅会引起人身触电，还会酿成火灾、煤尘及瓦斯爆炸等恶性事故。
The mine electric leakage can not only cause the electric shock of the people but also some serious accidents such as the fire hazard, coal dust explosion, and gas explosion, etc.
3
本文阐述了漏电火灾报警系统的组成，设置的必要性，设置的原则以及设计方法。
This text expatiated the composing necessity of setting, principles of setting and methods of design of creepage fire alarm system.
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