The common causes of fires in cable trays include line overload, short - circuit, and external fire sources, etc. Moreover, there are characteristics such as fast fire spread speed, difficulty in approaching the fire source (inside the ceiling, walls, or underground pipe galleries), limited selection of fire extinguishing agents (non - conductive fire extinguishing agents are required), and high possibility of fire re - ignition. In addition, the cable has a long distance, and problems may occur at any point, making supervision and maintenance difficult.

The automatic fire - extinguishing device of the Fire - Extinguishing - Probe® fire - extinguishing tube independently developed and produced by FUJI Security Technology has an appearance similar to that of a cable wire. It can be placed in the cable tray together with the cable wire, close to the cable at a short distance, without taking up extra space, power, and other support, and without the need for maintenance. When the cable catches fire, the fire - extinguishing tube monitors through its own temperature detection function and automatically releases fire - extinguishing substances to effectively curb the primary fire of the cable tray. The fire - extinguishing tube can also release fire - extinguishing substances with insulating properties multiple times to prevent the re - ignition of the cable.

The fire - extinguishing tube can also be combined with temperature - sensing optical fibers to achieve real - time temperature monitoring and network - connected temperature early warning. Compared with other monitoring equipment, this monitoring and fire - extinguishing method has the advantages of lower cost, easy laying and installation, low maintenance cost, and more effective curbing of primary fire points.

The fire - extinguishing tube of FUJI Security Technology is a patented product of Fuji Safety, has the internal standards of Fuji Safety enterprise, has passed the fire - extinguishing inspection, and relevant experimental reports of effective fire - extinguishing have been issued.