What is a flame retardant cable, and should the cable between the high voltage cabinet and the trans

What is flame retardant cable, first of all, the definition of "flame retardant" is explained: "flame retardant" does not have the function of preventing fire, but when the fire occurs, it has a certain function of "preventing the spread of flames". Therefore, "flame retardant" is also called "non-flame retardant", when the fire source other than the cable is extinguished or far away, the cable no longer continues to burn and extinguishes itself, which is the original meaning of the "flame retardant" characteristic.

When there is no fire, "flame retardant" has no meaning.

It should be noted that it is more important to choose a cable with sufficient transmission capacity (e.g. sufficient conductor cross-sectional area and appropriate voltage level) and to have a good installation method than "flame retardant". Because fire is more about prevention, not firefighting. If the cable has a good quality cable with sufficient transmission capacity and has a good installation, the safe transmission of electricity is ***, and vice versa.

Flame retardant cables are currently divided into four categories: A, B, C and D, and the method of judgment is through GB T 18380-2008 "Combustion Test of Cables and Optical Cables under Flame Conditions", and Class D is used to evaluate the occasion of small cables with very low volume content of non-metallic materials; Class C is a general flame retardant cable, which is indicated by adding "zr" or "zc" before the cable model, such as flame retardant PVC sheath; Class B is a low-smoke and low-halogen flame retardant cable, which is indicated by adding "DDZR", "DDZB" or "DD" before the cable model, and the judgment method is not only a bundle combustion test, but also needs to determine the smoke density and hydrohalic acid release during combustion; Class A is a low-smoke halogen-free flame retardant cable, which is indicated by adding "WDZR", "WDZA" or "WD" before the cable model, and the judgment method is also the above three tests. Class A flame retardant requirements are the highest.

In short, I hope you have a correct understanding of the functions of "flame retardant" and "fire resistant" cables, do not misunderstand, do not abuse, and do not be superstitious.

The cable between the high-voltage cabinet and the transformer of the general substation can be satisfied by using Class C flame retardant.

No. Flame retardant cables.

It refers to the cable in which the sample is burned under the specified test conditions, and the spread of the flame is only within a limited range after the test ignition source is removed, and the residual flame or residual burning can be extinguished by itself within a limited time. The fundamental characteristic is that it may be burned out and cannot be operated in the event of a fire, but it can prevent the spread of fire.

In layman's terms, in case of fire in the wire, the burning can be limited to a local range, so as not to spread, save other equipment, and avoid greater losses.

Whether it is necessary to use flame-retardant or fire-resistant cables should be decided according to the load level of the distribution line, the fire alarm level of the distribution project and other factors. There are clear provisions in the fire protection code or high regulations for building design, and fire protection treatment may not be taken for power distribution rooms and cable trenches; Therefore, the cable between the high-voltage cabinet and the transformer in the distribution room does not need to be flame retardant;

Flame retardant cables and high-voltage cables are not a concept. Flame retardant cable refers to a cable that can keep the wires and cables in normal working condition for a certain period of time in the event of a fire and does not contribute to the spread of fire. The main function of flame retardant cable is to prevent the occurrence and spread of fire and ensure the safety of life and property.

The high-voltage cable refers to the cable with a voltage level of 1kV and above, which is mainly used to transmit high-voltage electricity. The importance of high-voltage cable lies in the fact that it can transmit electricity to long distances to meet the needs of people's production and life. It should be noted that although flame retardant cables and high-voltage cables are not a concept, in actual use, due to the variety of types and specifications of wires and cables, some high-voltage cables may also have special properties such as flame retardant to ensure their safety performance in the event of fire.

Non-combustible mineral insulated cables can be used in tank farms, important timber structure public buildings, high-temperature places and other situations with high fire resistance requirements and acceptable laying installation and economic performance. If the self-contained oil-filled cable is laid in public corridors, passenger tunnels, bridges, etc., which require fire prevention treatment, it can be laid with buried sand. The cable trench close to the oil-impregnated equipment such as high-voltage current and voltage transformer should be sealed with the trench cover plate in this section.

3.Dense places In cable dense places or closed passages with high safety requirements, automatic fire detection and alarm devices suitable for reliable environmental actions should be equipped.

When the cable is laid in bundles;

Class I high-rise and important public buildings "should" be adopted;

The second type of place is "appropriate" to be adopted.

Non-combustible mineral insulated cables can be used in oil tank farms, important wooden structure public buildings, high-temperature places and other situations where the fire resistance requirements of the slow selling bridge are high and the laying installation and economic performance are acceptable. If the self-contained oil-filled cable is laid in public corridors, passenger tunnels, bridges, etc., where fire protection treatment is required, it can be buried and laid with sand. The cable trench close to the oil-containing equipment such as high-voltage current and voltage transformer should be sealed with the cover plate of the bucket lift section.

3.Dense places.

In cable-dense places or closed passages with high safety requirements, automatic fire detection and alarm devices suitable for reliable environmental operation should be equipped.