Implementation standard: Q/CNF 17-2018

Rated voltage: U0/U 8.7/10(15)

Fire resistance: in line with GB/T19216.11-2003

1 conductor

The conductor is made of oxygen-free copper wire with high conductivity. In order to ensure that the product has good electrical properties and certain softness, and is easy to install and lay, the section is reasonably controlled in the design and manufacturing process. The tightness of the conductor reaches more than 90%, the roundness reaches more than 98%, the surface of the conductor is smooth, no burrs, scratches. Semi-conductive tape must be wrapped around a conductor with a cross-sectional area of 500m or more.

2 Extrude the shielding layer

Extrusion shielding layer material can be crosslinked semi-conductive material shielding material, the thickness is controlled at 0. 7m. The conductor shielding layer, insulation layer and insulation shielding layer are extruded in one time by the three-layer co-extrusion technology, so as to ensure that the extrusion thickness of the conductor shielding layer, insulation layer and insulation shielding layer is uniform and tightly coated with each other, and the maximum partial discharge does not exceed 5pc at 1.73U. 2.3.3 Insulation layer

3. The insulating material is crosslinked polyethylene insulating material with good flexibility, mechanical strength and electrical performance. While ensuring the electrical insulation performance of the cable, the tensile strength and extrusion resistance of the insulation layer are enhanced.

4. The metal shielding layer is made of a cable with a thickness of 0.10mm overlapped with a soft copper strip, and the average overlap rate is no less than 15%.

5. The heat insulation layer is filled with inorganic fiber material and wrapped with inorganic fiber tape. When the flame attacks the cable, the high flame retardant inorganic fiber filling and wrapping decompose into metal oxides and precipitate crystal water. The metal oxides decompose into a network structure, which has a certain adsorption effect on the smoke. The precipitated crystal water not only plays an obvious sedimentation effect on the smoke particles, but also has a better heat-absorbing effect. In addition, carbonized structure can be formed in the combustion process. This carbonized layer obstructs the supply of air and the flow of flammable gas, so it is better protected

6 Fire shielding layer

The fire shield layer adopts ceramic polymer composite refractory polyolefin. In the case of flame ablation, the organic material will be ablated in a very short time, and then soon added into the ceramic reaction process, transformed into hard ceramic material, forming a good insulation layer, blocking the continued burning of the flame, and playing a good fire prevention effect.

7 Cooling layer

Inorganic metal hydrate is adopted. Due to its excellent thermal conductivity and flame retardancy, it fully guarantees the high flame retardancy of the cable. In the process of cable combustion, the material is precipitated into crystalline water after high temperature and decomposed into metal oxide, which can form a porous shell adsorbed on the surface of the refractory layer. The precipitated water can play the role of cooling the refractory layer sufficiently.

8 Sheath

The sheath is extruded with halogen-free low smoke flame retardant material, and the production process of large cable sheath with metal armor is more important.