In the fire in our country, the fire caused by wire and cable accounted for a large proportion of the fire, the fire igniting wire and cable combustible insulation and sheathing materials led to further expansion of the fire accident, wire and cable insulation and sheathing materials burning emit toxic gas will cause casualties, and hinder the fire extinguishing personnel, fire may lead to fire equipment power lines burned down. Can not ensure the normal operation of fire electrical equipment, delay the fire fighting time, resulting in greater personnel and property losses.

Make the selection of wire and cable safe and reliable, advanced technology, economic and reasonable, to prevent the fire caused by wire and cable, reduce the personal injury and property loss caused by wire and cable in the fire, to ensure that the fire equipment power line in the fire can still maintain its integrity in a timely manner, then what are the commonly used wire and cable in the fire distribution line? What is flame retardant wire and cable?


What is flame retardant wire and cable? Cables? Burning wire and cable? Burning wire and cable?

Flame retardant wire and cable is a wire and cable with the ability to prevent or delay the occurrence or spread of flame, that is, under the specified test conditions, the wire and cable are burned, and after removing the fire source, the flame spreads on the wire and cable only within a limited range and can extinguish itself. Flame retardant wire and cable is not a non-combustible cable, it just adds flame retardant materials in the insulation layer and sheath layer, so that the cable will not be delayed in the fire, in the case of the disappearance of the external fire source, after a period of time will self-extinguish.

Flame retardant wire and cable level according to flame retardant performance is divided into flame retardant first, flame retardant second, flame retardant third and flame retardant four levels, each level according to the flame retardant sample category is divided into A, B, C, hereinafter referred to as ZA (flame retardant A class), ZB (flame retardant B class), ZC (flame retardant C class)

What is fire-resistant wire and cable?

Fire-resistant wire and cable is fire-resistant test under the specified fire source and time, with the ability to power operation under the specified state, that is, to ensure the integrity of the line. Fire-resistant cable can maintain the normal operation of the line for a certain period of time, mainly used in fire conditions must also ensure the normal transmission of power important occasions.

Fire-resistant cables must be made of copper conductors with a rated voltage of 0.6/1.0kV and below, and the insulation layer has fire-resistant characteristics, otherwise a fire-resistant layer should be set on the conductor or cable core. The refractory layer is usually made of multi-layer refractory mica tape, which belongs to inorganic insulating material and is composed of glass fiber, mica powder and silicate. The material can be burned into a hard and dense insulator material attached to the conductor surface after fire, so as to ensure the normal operation of the line under fire conditions.

What is special wire and cable?

Special wire and cable refers to the halogen-free, low smoke, non-toxic, high temperature resistance, radiation resistance and other characteristics, the application of special environment or special purpose wire and cable. At present, the main products are non-toxic, low-smoke wire and cable, and the toxicity of halogen cables released in the fire is very terrible.

If the toxicity of the gas concentration that can cause death in 30 minutes is judged to be 1, then the toxicity index of PVC is 15.01, and the toxicity index of halogen-free polyolefin is 0.79. During the fire, the strong smoke makes the victim disoriented, thus prolonging the time spent in the fire.


Classification of flame retardant and fire resistant wire and cable combustion characteristics


According to the combustion characteristics of wire and cable can be divided into ordinary wire and cable, flame retardant wire and cable, fire resistant wire and cable, non-combustible wire and cable (mineral insulation), special wire and cable and so on. Ordinary wire and cable is the use of organic materials as insulation layer and protective sleeve, easy to catch fire and spread in the flame, does not have flame retardant, fire resistant, halogen free and low smoke and other characteristics of wire and cable.

When the ordinary wire and cable are used as the distribution line of the fire protection electrical equipment, the tube should be hidden in the non-burning structure and the thickness of the protective layer is not less than 30mm, which is the most common practice at present. Non-combustible wire and cable, also known as mineral insulated wire and cable, is usually composed of copper core, copper sheath and magnesium oxide insulation and other inorganic cables, with non-burning and non-toxic smokeless performance in the flame.

Misunderstanding of flame-retardant and fire-resistant wire and cable


China's current fire code for flame retardant, fire-resistant wire and cable selection is mostly principled and recommended, too simple and general, coupled with a wide variety of flame retardant, fire-resistant wire and cable, different manufacturers of product performance and labeling are different, resulting in designers of flame retardant and fire-resistant wire and cable there are a lot of misunderstanding.

The selection of flame retardant and refractory wire and cable must be flame retardant, in the actual project, if you can not according to the prescribed flame retardant level to select qualified flame retardant wire and cable, its flame retardant wire and cable may not be able to play a flame retardant role. Common cases are:

Common cases are:

The flame retardant level does not meet the requirements, and the non-metallic content exceeds the standard; Flame-retardant cables and non-flame-retardant cables are laid in the same pipeline; The supplier is shoddy, the owner is cheap, and so on, then the flame retardant cable can not reach the flame retardant effect.
Generally fire-resistant wire and cable does not mean that the cable can be fire-resistant for a long time, but it can be maintained for a period of time in a fire. If a flame retardant is not added to its insulation layer and protective sleeve layer, it does not have flame retardant properties.

Qingdao Tianxing Cable Co., Ltd. is a technology enterprise specializing in the production of wire and cable in Shandong Province, with more than 150 sets of domestic excellent cable production equipment and testing equipment, excellent production technology, modern testing equipment, to ensure stable product quality and timely supply. The company's main products are power cable, mineral cable, high life wire and cable, radiation crosslinked cable, control cable, computer cable, photovoltaic cable, communication cable, data cable, low smoke halogen free cable, flame retardant series wire and cable.

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