A diversified project for electrical fire is proposed in this paper, in order to effectively monitor the electrical fire of low voltage cables in coal mine wellhead. Firstly, it is relay protection, to prevent fire accident caused by cable heating because of electrical fault. Secondly, it is temperature fire detection alarm, smoke fire detection alarm or infrared fire detection alarm, to detect initial fire caused by external high temperature, and to be the backup of relay protection. Thirdly, it is video monitoring, to provide basis of fire determination for the person on duty. To combine the three, can realize the effective monitoring of electrical fire. And it also gives practical engineering applications at last.