With the advent of the big data era, network informatization has become increasingly popular, and the integrated wiring system has changed from a new invention 20 years ago to the information system transmission cable that can be seen everywhere in people’s daily life. At the same time, the integrated wiring system will more or less produce harmful gases and smoke in the flame, and may also help the fire gradually spread to other floors or other rooms.
According to the statistics of the fire department, about 85% of deaths in fires are caused by poisoning by harmful gases generated in the fire, suffocation by diffuse smoke, or inability to escape due to invisible paths. In buildings, the number and spread of integrated wiring cables exceeds that of various cables in buildings. Therefore, the fire protection of integrated wiring systems has begun to become one of the key considerations for system performance.
The formation of two long-standing concepts of fire safety:
In the past 15 years (1987-present), halogen-free flame retardant systems have gradually entered Europe and have been accepted as a part of cable manufacturing technology. This is not the case in the United States, which is generally limited to products sold back to Europe. Europe and the United States have completely opposite views based on different national conditions and backgrounds:
The concept circulated in the United States believes that the root of the disaster lies in the production of carbon monoxide (CO) poisonous gas and the heat release from the conversion of CO to CO2 during the subsequent flashover (“flashover”) process. Therefore, if the heat release of the process can be controlled by some methods, the fire hazard can be reduced. This is the prospect of the birth of UL flame retardant, so the outer sheath of UL flame retardant system cable still uses PVC material, and whether it is CMX CM or CMR, even CMP only regulates the concentration of smoke generated by combustion, but still Separate the toxicity. (CMX CM CMR CMP flame retardant specific standards, please search “UL flame retardant CM/CMR/CMPD grade and LSZH network cable”)
European tradition has always believed that the severity of the disaster depends on the success rate of people leaving the fire scene. The irritation and toxicity of the smoke are the main factors restricting the escape from the fire scene. Therefore, priority attention should be given to smoke, toxicity, and corrosion generated during combustion. In other words, it is imperative to completely abandon the production and use of halogen substances. This led to the definition of LSZH.
Post time: Apr-19-2021