Based on the statistical data of cable tunnel fire accidents at home and abroad in recent years

the causes and characteristics of cable tunnel fire accidents are summarized and the various fire extinguishing systems are introduced

such as water spray fire extinguishing system

high-pressure water mist fire extinguishing system

gas fire extinguishing system

aerosol fire extinguishing system and ultra-fine dry powder extinguishing system. According to the analysis of technology and economics

it is recommended to adopt the high-pressure water mist fire extinguishing system in the longdistance and largevolume cable tunnels

and the ultrafine dry powder fire extinguishing system is recommended in the cable joints or other key protection areas for local fire extinguishing. However

it is not recommended to use gas fire extinguishing system

water spray fire extinguishing system and aerosol fire extinguishing system in longdistance and large-volume cable tunnels.