Wires and cables are used in various industries, so before we choose and buy wires and cables, we will understand various parameters and evaluations through the network, but many of the evaluations on the Internet are not very professional, often causing users' psychological doubts and worries. it will also be blocked in the selection and purchase. Below Qi Yue high-temperature cable for you to explain in detail our common misunderstandings of the cable.
Will there be radiation from wires and cables?
Wires and cables do have radiation, but the fact is that everything that is charged has radiation, such as 220V wires, but the radiation is so small that it is basically negligible, and the radiation of wires is much lower than that of mobile phones. If you are really afraid of wire radiation, you can throw away the phone first. If you are afraid of the magnetic field produced by wires and cables, and think that the magnetic field will cause any harm to the human body, then the geomagnetic field is even more terrible. Therefore, it is unfounded to think that "radiation from wires will harm your health".
Second, if the wire is not square enough, it will not be qualified.
Not absolutely! For many people, this is already a common sense existence, but this is not the case. With the improvement of the production process of conductor materials and the progress of science and technology, the advanced production technology of oxygen-free copper has been widely used. the resistivity of copper conductor is enough to ensure that the copper wire with less than nominal diameter can meet the requirements of DC resistance of corresponding specifications, while the conductor of wire and cable has strict requirements on the resistivity of conductor. for example, the DC resistance of 25 square mm copper core conductor is not more than 0.727 Ω / km at 20 °. Therefore, as long as theacsr conductor is not greater than this value, the conductor is qualified.
Third, the thicker the cable insulation, the better?
No, the cable insulation is too thick will increase the difficulty of cable laying, now the cable laying is mainly bridge or pipe, now many enterprises are implementing tight cable requirements, small outer diameter, can have gaps in the laying process, emit heat, and ensure that the outer sheath of the cable will not be damaged, otherwise, it will bring some difficulties to the construction unit and cable laying. In summer, the working temperature will rise, these temperatures will be emitted through the outer sheath, the thickness of the sheath will increase, and the heat energy will be difficult to distribute, which will affect the service life of the cable, because PVC under the action of heat, the insulation layer will undergo a series of physical and chemical changes, losing the original excellent performance, resulting in a significant decline in insulation performance, and even a short circuit, so when choosing a cable, it will take place a series of physical and chemical changes, resulting in a significant decline in insulation performance, and even a short circuit. The thickness of the abc cable must meet the standard.
Fourth, the flame retardant cable will not burn.
Incorrect! The flame retardant of flame retardant wires and cables means that when a fire occurs in wires and cables, it can block and delay the spread and spread of flame along the wires and cables, and minimize the expansion of the fire range of wires and cables. this type of cable has the characteristic of self-extinguishing after fire. Fire-resistant wire and cable means that in the wire and cable fire accident, the wire and cable product can maintain the normal operation for a certain period of time while the external flame is still burning, maintain the integrity of the wire and cable line and maintain the normal operation of the line equipment.
Fifth, the laying of water and electricity should be horizontal, horizontal and vertical.
Not necessarily! Although the horizontal screen vertically laid water and electricity wires look very good, but they really have a lot of hidden dangers! First of all, the material cost of the conduit is much higher than other ways of laying, and secondly, because it is horizontal and vertical 90 degrees, it is easy to be stuck in the later stage when wearing the wire! So as long as it conforms to the specification!