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How does cable cladding affect the fire resistance of cables

2020/03/09

Nowadays, with the continuous development of communication technology, many fields need to use electric wires and cables, but we all know that electric wires and cables are generally made of combustible materials such as plastic or rubber, once a fire, the consequences are unimaginable.Let's talk about how the cable cladding affects the fire resistance of the cable.

How does cable cladding affect the fire resistance of cables

The insulation material of fireproof cable USES PVC, PE, XLPE to wait commonly.In the 750℃ high temperature combustion state, the insulation layer of the cable basically no longer exists, the purpose of the insulation layer is to ensure the normal electrical performance of the cable and the protection of the refractory layer, does not determine the fire-resistance characteristics of the cable, but should be considered in the high temperature combustion insulation layer state on the impact of the refractory layer.

If the cable wrapping layer is combustible non-woven cloth or PVC tape, it is basically burned out with the insulation, which can make the stress deformation caused by temperature fluctuations have enough space to diffuse and release, and the compressive damage to the refractory layer is small, so the impact on the fire performance is small.If the cable wrapping layer is coated glass ribbon or mica tape, because the wrapping layer has certain fire-proof performance, because of the fire insulation effect of the wrapping layer, when burning, the insulation material is not in direct contact with the flame to be burned, but by heat melting.

Due to the tightening effect of the wrapping layer, the stress and deformation caused by the melting of the insulating material cannot be released outwardly, which causes the refractory layer to bear large extrusion impact force.In addition, if the cable is armored, when the temperature changes, the stress deformation of the steel belt is also applied to the refractory layer, which makes the refractory layer more damage, so it is difficult to pass the fire test.

Today, wires and cables are used everywhere and the probability of disaster is relatively high, so fire-resistant cables can play an important role in a fire.In addition, no matter in which field of fire - resistant wire and cable is vigorously promoted.

In addition, to ensure that fireproof cable can play a practical role, wire and cable manufacturers must be in strict accordance with the production of fireproof cable technology, to ensure its quality.It is worth noting that the cladding structure of fireproof cable has an effect on the fireproof performance.In order to reduce the cost, non-woven tape can be used for the mica outer protective layer of non-low smoke type refractory cable.

How to make the structure of wire and cable

Generally, glass ribbon, PVC tape or non-woven tape should be wrapped around the insulated wire core after cable forming as reinforcement, so that the cable after cable forming can keep the structure round.If the choice of wrapping tape is not suitable, it will affect the fire resistance of the fire-resistant cable.Using the same mica strip number and wrap-around layer structure, the wrap-around non-woven tape or PVC tape after the cable can pass the fire resistance test, but the wrap-around coated glass ribbon or mica tape with fire resistance performance may not pass the fire resistance test.

The purpose of the design is to improve the fireproof performance of the cable by means of their fire-proof performance, but the test results show that the fireproof performance is reduced.

What is the difference between fireproof cable and fireproof cable

1. Terms and definitions of fire-resistant cables and fire-resistant cables

1) flamer etardance

Under specified test conditions, the sample is burned. After removing the ignition source, the flame spread on the sample is only within a limited range and self-extinguishing, that is, it has the ability to prevent or delay the occurrence or spread of the flame.

2). The firer esistance

The ability to continue running in a specified state while burning at a specified source and time, the ability to maintain circuit integrity.

2. Principle difference between fire-resistant cable and fire-retardant cable

The flame retardant principle of halogenated cable is the flame retardant effect, and the flame retardant principle of halogen-free cable is to reduce the temperature.Refractory cable principle is mica material.

3. Difference between structure and material of fire-resistant cable and fire-resistant cable

Basic structure of flame retardant cable:

(1) insulation layer

(2) jacket and outer cover

(3) strap and fill

A refractory layer is added between the conductor and the insulation layer of fire-resistant cable, which can withstand long-term combustion and ensure normal operation of the line.

4. Advantages and disadvantages of fire-resistant cables and fire-retardant cables

Flame retardant cable features: low cost, flame spread control in a certain range, improve the fire level of the cable line.

Fire-resistant cable: the production of less acid gas smoke, fire-retardant performance greatly improved, to maintain the integrity of the line operation.Fire-resistant cables can maintain normal power supply for a period of time in case of fire, while fire-resistant cables do not have this characteristic.Relatively speaking, the price of fire-resistant cable will be more expensive.

The above is all about how the cable cladding affects the fire resistance of the cable, I hope to give you some help.Of course, when we choose and buy cables must be comprehensive and correct understanding of flame retardant and fire-resistant cables, this is the correct choice of their primary conditions.

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