【Summary description】 Wire and cable manufacturers believe that the main function of cable insulation is to reduce leakage, short circuit, open circuit, etc. In real life. When this happens, wires and cables can automatically stop leaking electricity to avoid serious consequences such as damage to personal property. In the detection process, how to distinguish the resistance value of wire and cable to reflect the quality of wire and cable is qualified, mainly because the insulation resistance of wire and cable is inversely proportional to the length of wire and cable. That is, the longer the length of wire and cable, the greater the resistance, and vice versa.

Wire and cable manufacturers believe that the main function of cable insulation is to reduce leakage, short circuit, open circuit, etc. In real life. When this happens, wires and cables can automatically stop leaking electricity to avoid serious consequences such as damage to personal property. In the detection process, how to distinguish the resistance value of wire and cable to reflect the quality of wire and cable is qualified, mainly because the insulation resistance of wire and cable is inversely proportional to the length of wire and cable. That is, the longer the length of wire and cable, the greater the resistance, and vice versa. In addition, when calculating the resistance value, the detected resistance value can be multiplied by the length of the wire and cable, and the data is the specific resistance value of the entire wire and cable.

Wire and cable professional manufacturers believe that when measuring the resistance value of wire and cable, the first method is megohm meter method, commonly known as voltage and current method. This method is mainly used to measure the insulation resistance of some metal cables and multicore cables. After measuring the metal cable, dip the cable into water to test the insulation resistance of the single-core cable in the nearsighted cable. However, for the blue color of multi-core cables, the remaining core wires of each cable need to be connected with water. And during the measurement, the water temperature should be kept constant, so that the measurement results can match the current water temperature and the test can be more reliable.

Professional manufacturers of wire and cable think that when testing the function of wire and cable, it is not only necessary to test the conductivity of wire and cable, but also to test the fire resistance, toxicity, flame retardant and density of wire and cable. When the temperature and current through the wire and cable are constant, the stronger the conductivity, the stronger the role of the wire and cable, and vice versa. In addition, the toxicity test of wire resistance should be strictly carried out. Rats can be used to release gas from wires and cables. Useful tests should be carried out under conditions of high temperature and satisfying heat, and the gases produced should be analysed. Harmful gases exceed the standard, the product is not qualified, otherwise qualified.

Professional manufacturers of wire and cable believe that when testing fire resistance, it is necessary to ensure that the target being tested burns under conventional test conditions at conventional temperatures. If the sample burns within a certain amount of time, it is marked as poor fire resistance and is not qualified. Otherwise, it is qualified. This kind of experiment really reflects the real situation. In real life, when there is a fire, wires and cables can not be burned immediately, there will be a cyclic process. In this way, after a fire, qualified cables and wires will provide power to one hand and facilitate rescue. In this respect, flame-retardant wires and cables are inferior to fire-resistant cables. Fire-retardant cables cannot be used after a fire breaks out, but they can stop the fire from spreading further for a period of time, saving rescue time.

Wire and cable professional manufacturers believe that in the process of wire and cable inspection, the size and appearance of the inspection is also very important. The appearance of cables determines their first impression. The first impression also determines whether the quality of the wire and cable is confirmed. Carefully check the appearance, timely correct cracks, oil stains and other defects affecting the normal operation of wires and cables. In addition, thickness, height, density, etc. During dimensional inspection, the quality of the sample under inspection shall be ensured to meet the inspection specification as far as possible. If it meets the inspection specification, it is qualified product; Otherwise, it is a substandard product.