Due to the increase in the number of wires and cables, concentrated laying, and poor construction quality, the risk of wire and cable fires has been exacerbated. Therefore, in practical engineering applications, the prevention of wire and cable fires must start with controlling hazardous factors and applying relevant regulations to take corresponding fire prevention measures.

The main characteristics of wires and cables in a fire are:In the event of a fire,

The temperature of a fire is generally between 800 ℃ and 1000 ℃. Wires and cables will quickly lose their insulation ability, leading to secondary electrical accidents such as short circuits and causing greater losses;

2-wire cables have a significant overload capacity under the specified allowable current carrying capacity; Wire and cable can cause insulation material to melt and burn instantly;

Under the condition of 3 short circuits. And ignite the surrounding combustibles.

Fire performance analysis of wires and cables:The flame retardant mechanism lies in the decomposition and heat absorption of flame retardants in the condensed phase

Under the thermal effect of combustion reaction. Slowed down the temperature rise within the condensed phase and slowed down the thermal decomposition rate of the material; Release chain reaction free radical blockers;

After the flame retardant decomposes upon heating. Interrupted the branches of flames and chain reactions, slowing down the gas phase reaction rate; The formation of coking layer or foam layer strengthens the role of these layered hard shells in blocking heat transfer;

3. Catalytic condensed phase thermal decomposition solid phase products. Flame retardants undergo endothermic phase transition;

Under the action of heat, it physically prevents the temperature inside the condensed phase from increasing.

The fire-resistant mechanism reduces the heat generated by polymers:

Add a certain additive to the insulation and sheath materials of wires and cables. Prevent polymer decomposition or promote carbonization of insulation and sheath materials to form a maintenance layer;

2After the insulation and sheath layers are corroded by fire, an inorganic insulation material such as mica glass ribbon is added to the core. *The mica refractory tape wrapped around the conductor is maintained and continues to operate normally for a certain period of time during a fire.