Representation of flame-retardant wire and cable products
The model representation method of the flame-retardant wire and cable: The model of the flame-retardant wire and cable is added ○-□ before the model of the ordinary cable. 〇- is the flame-retardant code and represented by Z, □- is the flame-retardant grade code, and the flame-retardant grade ABCD is used Means.
Products are expressed by model, rated voltage, core number, nominal cross section and the number of this standard.
For example: Rated voltage 450/750V flame-retardant PVC wire, single core, 4mm2, expressed as ZB-BV 450/750V 1*4 Q/TEC16.03-2005
Rated voltage 600/1000V flame-retardant Class B XLPE insulated PVC sheathed power cable, 3-core, 240mm2, denoted as ZB-YJV 600/1000V 3*240 Q/TEC16.03-2005

See the table for the model and name of the cable

　This product is suitable for power transmission in power lines with a rated voltage of 0.6/1KV and below. The resistance wire and cable is difficult to catch fire and has the ability to prevent or delay the spread of flame. It is suitable for a variety of occasions where the cable has flame retardant requirements

Using features
The rated voltage U0/U of the flame-retardant cable is 0.6/1KV, the rated voltage U0/U of the flame-retardant control cable is 450/750V, and the rated voltage U0/U of the flame-retardant wire and cable is 450/750V and below.
　　The long-term allowable working temperature of PVC insulated cables does not exceed 70℃, and the long-term allowable working temperature of XLPE insulated cables does not exceed 90℃
　　 The ambient temperature during installation should not be lower than 0°C.
　　Minimum bending radius during cable installation
　　The outer diameter (D) of the flame-retardant wire is less than 25mm, the allowable bending radius of the cable should not be less than 4D, the outer diameter (D) is 25mm and above, and the allowable bending radius of the cable should not be less than 6D.
　　 Flame-retardant and fire-resistant control cables: cables without armor layers should be no less than 6 times the outer diameter of the cables, cables with armored or copper tape shielding structures should be no less than 12 times the outer diameter of the cables.
　　The minimum bending radius of flame-retardant and fire-resistant power cables is shown in Table 3

D-Outer diameter of the cable

Table 4 Nominal cross-section of neutral conductor of multi-core cable

　　The conductive core of the single-core cable is round, and those of 16mm2 and above can be pressed tightly. For multi-core cables with a cross-section of 35mm2 and below, the core should be round, and those with a cross-section of 50mm2 and above should be fan-shaped, tile-shaped or semicircular. The fourth core (neutral core) in a four-core cable can be round or fan-shaped. The neutral wire of a five-core cable can be round or tile-shaped. Those with a diameter of 6mm2 and below are allowed to be composed of a single conductor, and those with a diameter of 10mm2 and above are composed of multiple single wires. The shaped conductor (sector, tile or semicircle) should be tightly pressed.
Main performance
The finished wire should be able to withstand 5 cycles of vertical burning test without transmitting flame. After the test, the continuous burning time of the sample should not exceed 1h. The finished cable should be subjected to a bundled cable burning test. After the test, the height of the scorched or affected part of the cable should not exceed 2.5m above the point of action of the flame.
The wire and cable should withstand the low-temperature winding test or low-temperature impact test at -15℃. After the test, there should be no visible cracks on the surface of the sample.
The insulation volume resistivity of the finished wire at 70℃ should be greater than 1*1010Ω/cm.
The finished flame-retardant and fire-resistant wire should be able to withstand the 2.5KV AC voltage test without breakdown in 5 minutes. The finished flame-retardant and fire-resistant control cable should be able to withstand the 3KV AC voltage test without breakdown in 5 minutes. The finished flame-retardant and fire-resistant power cable should be able to withstand the 3.5KV AC voltage test, and the flame-retardant and fire-resistant wire and cable should not be broken for 5 minutes. The flame-retardant and fire-resistant wire and cable are made of highly flame-retardant polyvinyl chloride plastic, and the oxygen index is greater than 30%. The cables are the same.
Cable specifications and reference data

The specifications, structural dimensions and weight of the flame-retardant wire and cable products are according to the common type and similar products.
Selection points of flame-retardant cables

When 　　 wires and cables are laid in bundles, flame-retardant wires and cables should be used.
Method for selecting flame retardant grade of flame retardant cable:
Calculate the total volume of non-metallic materials of wires and cables according to Table 5 to Table 7, and then determine the flame retardant grade according to Table 1.
For cables laid in the same channel, cables of the same flame-retardant grade should be selected. Flame-retardant and non-flame-retardant cables should not be laid in the same channel. For cables laid in a box with a cover and a cable trench with a cover, if measures such as blocking and water blocking have been taken to prevent flame extension, the first-class flame-retardant requirement can be reduced. The flame-retardant cable must indicate the flame-retardant level. Those who indicate the level shall be regarded as C level.

Table 5 Reference table for non-metallic content of 450/750V PVC insulated wires

Table 6 Reference table for non-metallic content of 0.6/1KV PVC insulated unarmored cables

Continued Table 6

Continuous table of table 7

Delivery length
The delivery length of the cable should not be less than 100m, and the measurement error should not be greater than 0.5%. It is allowed to deliver short cables with a length of not less than 20 meters, and the quantity should not exceed 10% of the total length of delivery.
According to the agreement between the two parties, any length of cable is allowed to be delivered.
Packaging signs and transportation
The cable should be properly packaged on a cable reel for delivery. The length of the cable extension should not be less than 300mm, and the end should be reliably sealed with a cable jacket.
Each cable package should be accompanied by a product quality certificate. The certificate should be placed in an impermeable bag and fixed on the side of the cable reel.　　　　　　　　　　　　　　　　
Each outer cable tray should be marked:
Length m Manufacturing Date: Year Month
Standard number
Gross weight kg:
The symbol that indicates the correct rotation direction of the cable reel. Transport and storage
Reel does not allow flat
During transportation, it is strictly forbidden to lower the cable reel with cables from a high place, and it is strictly forbidden to lose the cables mechanically.
When hoisting packages, it is strictly forbidden to hoist several trays at the same time. On vehicles, ships and other transportation tools, the cable reel must be placed firmly and fixed with a suitable method to prevent mutual collision or overturning.