The manufacturing process of magnesium oxide fireproof cable is relatively complicated. There are two main methods. First, the magnesia crystal powder is poured between the outer seamless copper tube and the core copper conductor, and then compacted. Second, the magnesium oxide powder is first pressed into a hollow cylinder. It penetrates between the conductor and the copper tube, and then is repeatedly made into a cable by a plurality of processes such as drawing, annealing, and drawing. It should be noted that in the processing of magnesium oxide cables, it is necessary to continuously detect the compactness of magnesium oxide and the airtightness of copper tubes. Through the understanding of the process and method of making magnesium oxide cable, we can see that the structure of the cable is mainly composed of three parts: the seamless copper tube sheath of the outer layer, the magnesia crystal powder with the insulating effect in the middle, and the copper as the conductor of the core. Baton.
The models of magnesium oxide cables can be divided into BTTQ light cable (500V class) and BTTZ heavy cable (750V class). The Kempinski project is mainly BTTZ heavy-duty cable. Its specifications mainly include single core, two core, three core, four core, seven core, twelve core and so on. Single-core to four-core magnesium oxide cables are mainly used for power and lighting, and more than seven cores are mainly used for communication and control. The single-core cable has a maximum cross-section of 4002mm2, and the maximum cross-section of the two-core to four-core cable core is 25mm2.