In the past decade, many buildings of a certain scale in China have installed electrical fire monitoring systems, but the usage of these systems is not optimistic. Most projects only use residual current electrical fire monitoring detectors, while the usage of temperature measuring electrical fire monitoring detectors, fault arc detectors, etc. in the system is very low. Even for residual current electrical fire monitoring detectors, their usage varies greatly in different regions, and the application situation of the system is indeed not optimistic. Basic situation of electrical fire prevention and control at home and abroad Among all electrical fires recorded in China, fires caused by faults in power supply and distribution lines account for about 65% of the total electrical fires, while fires caused by faults in electrical appliances account for about 35% of the total electrical fires. Therefore, setting up an electrical fire monitoring system in power supply and distribution lines is one of the targeted means to solve electrical fires caused by power supply and distribution line faults. Japan and South Korea have been using electrical fire monitoring systems for decades, and the system mode is basically the same as the current system mode in China. There is no specialized electrical fire monitoring system in Europe, America and other places. Their electrical fire prevention and control is achieved through a series of measures such as materials, processes, construction, maintenance, and improvement of the performance of protective electrical appliances in the power supply and distribution system, as well as local fire protection and improvement of the fire resistance performance of electrical appliances. Select corresponding fire-resistant and flame-retardant wires and cables based on the size and purpose of the building; Choose the appropriate circuit breaker based on electricity consumption; Electric water heaters, air conditioners, etc. use plugs or sockets with residual current, temperature measurement, fault arc and other fire prevention functions. The shell material of electrical equipment must be flame-retardant, and a series of measures are taken to achieve this. Correct understanding and use of electrical fire monitoring system The purpose and setting of residual current electrical fire monitoring detectors The residual current electrical fire monitoring detector is mainly used to monitor the normal working status of distribution lines, timely detect faults and fire hazards in the lines. When problems such as aging, damage, water ingress, and insulation degradation occur in distribution lines and their electrical equipment due to non-standard construction, the remaining current in the entire line will increase. After the detector alarms, timely troubleshooting can naturally reduce the probability of electrical fires. According to the purpose of use of this type of detector, its setting principle and installation position can be determined. The protection range should be determined based on the natural leakage current of the protected line, and its function should be maximized to maximize the protection range and reduce the number of detectors used. That is to say, if the first level distribution meets the requirements, there is no need to set it up at the second level distribution. The pure resistive leakage current in the circuit can be considered as the leakage current caused by insulation reduction. The resistive current separation technology can be used to accurately separate the "resistive component leakage current" Ior, which represents the insulation performance, from the residual current. The "capacitive component leakage current" Ioc caused by the circuit and equipment can be filtered out. The detector detects the pure resistive leakage current of the distribution line and implements leakage alarm, greatly improving the detection accuracy and alarm reliability, thus becoming another "online insulation monitoring electrical fire monitoring detector", achieving the purpose of real-time and online insulation resistance detection of the distribution line. The purpose and setting of temperature measuring electrical fire monitoring detectors The temperature measuring electrical fire monitoring detector is mainly used to monitor the overheating caused by overload, poor contact, increased contact resistance, etc. in the joint parts or the entire circuit of the distribution system, which can ignite surrounding combustibles and cause a fire. Temperature measuring detectors are divided into contact and non-contact types based on their sensor characteristics. Suitable detection methods can be selected based on the protected object. From the perspective of the complete circuit, the joints in the entire circuit are prone to overheating, and often the joints in the distribution circuit are relatively concentrated in the distribution cabinet (panel), which provides a good centralized arrangement condition for temperature measuring electrical fire monitoring detectors. Therefore, temperature measuring electrical fire monitoring detectors should generally be installed in the distribution cabinet in the distribution system. Of course, temperature measuring electrical fire monitoring detectors can also be used in other joint parts.