Author: Site Editor Publish Time: 2023-06-20 Origin: Site
A fire alarm cable is a special type of cable used to transmit signals in fire alarm systems. When a fire occurs, the fire alarm host will automatically detect the fire signal and transmit the signal to the alarm control room or other designated areas through the fire alarm cable. In this way, firefighters can respond in a timely manner and take necessary measures to extinguish the fire or evacuate people.
It is very important to choose the correct fire alarm cable, because different fire alarm cables have different characteristics and scope of application. For example, cables that work in high temperature environments need to be high temperature resistant, while cables that work in humid or corrosive environments need to be corrosion resistant.
If the wrong cable is selected, the fire alarm signal may not be transmitted normally, thereby delaying the fire response time and endangering people's lives and property safety. Therefore, the correct selection of fire alarm cables suitable for specific application scenarios is one of the keys to ensure the normal operation of the fire alarm system.
PVC insulated cable
Features: PVC insulated cable is a common fire alarm cable, the main features are low price, easy processing, wear resistance and oxidation resistance. PVC material itself has good electrical insulation properties, and can be added with flame retardants and other substances to improve its fire resistance.
Application scenarios: PVC insulated cables are widely used in indoor and outdoor power distribution systems such as various buildings, underground railways, and tunnels.
LSZH insulated cable
Features: The main feature of LSZH insulated cables (also known as low-smoke halogen-free cables) is that they do not contain halogen elements, produce less smoke, are less toxic, and are less corrosive when burned, and do not release harmful gases. In addition, LSZH cables also have high heat resistance and electrical insulation properties.
Application scenarios: LSZH insulated cables are widely used in power distribution systems in large public buildings, aerospace, metallurgy, petrochemical and other fields, especially suitable for high safety requirements and smoke generation will pose a greater threat to personnel escape place.
Teflon insulated cables
Features: Teflon insulated cables use polytetrafluoroethylene (PTFE) as the main material, which has excellent high temperature resistance, chemical corrosion resistance and electrical insulation properties. In addition, Teflon cables also have very good low dielectric loss and high frequency stability.
Application scenarios: Teflon insulated cables are widely used in aerospace, satellite communications, radio communications and other fields, especially suitable for use in harsh environments such as high temperature, high pressure, strong acid and alkali.
When selecting fire alarm cables, the following relevant regulations and standards need to be considered:
GB/T 19666-2005 "Technical Regulations for Fire Protection in Electrical Design of Buildings": This standard is aimed at the electrical design of various buildings, and proposes fire protection technical requirements that should be followed in the design, installation and use of various electrical equipment.
GB 50217-2017 "Code for Building Electrical Design": This standard is the basic specification of my country's construction industry, which puts forward detailed requirements for the design, construction and acceptance of building electrical systems.
Flame retardant test standards such as UL 2196 or EN 50200: These standards are internationally recognized flame retardant test standards, and the corresponding fire performance of cables in the event of fire can be evaluated through testing.
When considering the parameters and specifications of fire alarm cables, the following factors should be considered:
Cable material: The material of the cable will directly affect its fire performance and service life. Cables of different materials are suitable for different occasions and should be selected according to actual needs.
Cross-sectional area and current load of the cable: When selecting a cable, it is necessary to select a suitable cross-sectional area according to the current load to ensure that the cable can run stably.
Cable length: The length of the cable will affect its parameters such as resistance and inductance, which need to be considered clearly during design.
Fire performance of cables: For different use scenarios, the fire performance requirements of cables will also be different. For example, high-rise buildings, subway tunnels and other places need to use cables with higher fire performance.
Cable installation method: The cable installation method will also affect its fire protection performance and service life, and attention should be paid to comply with relevant installation standards and regulations.
In short, when selecting fire alarm cables, various factors need to be fully considered to ensure that the selected cables comply with relevant regulations, standards, and meet actual needs.
Fire alarm cable is a type of cable specially used in fire alarm system, usually need to transmit signal or power in case of fire. The following are several common fire alarm cables and their characteristics:
Twisted cable: It is composed of multiple thin wires, which can be flexibly bent, suitable for complex installation environments, but vulnerable to external interference.
Shielded cable: Wrap a metal covering around the conductor, which can effectively reduce external electromagnetic interference, but is relatively expensive.
Bundled cables: Several single-core cables of the same diameter are bundled together to form a whole, which simplifies installation but is prone to failure.
Flame-retardant cable: no toxic gas and smoke will be produced in the event of fire, which meets the fire safety requirements of buildings.
Proper selection, installation and maintenance of fire alarm cables are essential to ensure the normal operation of fire alarm systems. First of all, the appropriate cable type should be selected according to the actual situation, taking into account factors such as the installation environment, cable length, and current load. Second, care should be taken when installing cables to avoid excessive stretching or excessive compression to prevent damage to the cables. Finally, regularly check and maintain the fire alarm cables, and replace aging or damaged cables in time to ensure the reliability and stability of the system.
In short, the correct selection, installation and maintenance of fire alarm cables is an important link that cannot be ignored in fire safety work. It must be operated in strict accordance with relevant standards and specifications to improve the response speed and accuracy of the fire alarm system and ensure the safety of personnel and property.
