How long is the cable life?

Published on:

2022-09-29

The typical life span of a cable is 20 years. Some people may say that life exceeds 20 years or even longer. Yes, it is true that there are cables that have a life of more than 20 years. From a safety point of view, the design life is the longer life of the cable.

Factors affecting the life of a cable:

1. External damage: The past decade has seen rapid economic development and excessive development across the country. Life and transportation are more evident, especially in today's fast growing economy. Although cables are known to be damaged by external influences, many cable failures are caused by mechanical damage.

2. Insulation damping: In general, most cables are buried underground or in underground drainage pipes. In many cases, substandard cable joints will be under wet weather conditions, which will cause water or steam to enter the joint. After a long time, water branches will form under the action of electric field, which will gradually destroy the insulation strength of the cable and lead to failure.

3. Chemical corrosion: The cable is buried underground. When choosing the type of buried cable, the normal service time of corrosion-resistant cables is usually specified according to the corrosion capacity. If the corrosion-resistant cable is not buried underground, it will be affected by the microorganisms in the soil.

4. Long-term load operation: the cable is heated, the insulation is reduced, but also prone to aging and line short circuit. The high temperature of long-term overload operation will accelerate insulation aging. Especially in the hot summer, the temperature rise of the cable will cause the weak part of the cable insulation breakdown, cable failure is particularly frequent in the summer.

5. Cable joint abnormalities: cable joints are the weak link of the cable line, often human error caused by cable joint failure. In the process of making cable joints, poor crimping by the builder and insufficient heating of the joints can lead to lower insulation of the cable head, resulting in accidents.

6. Environment and temperature: The external environment and heat sources to which the cable is exposed can also lead to high cable temperatures, insulation breakdown, serious explosions and fires.

7. Cable aging causes and natural disasters: Each cable will be described and the general cable life span will be stated. If the time is longer than the time on the instructions, the cable will gradually fail; in addition to man-made causes, there are natural environmental factors, such as landslides, mudslides, fires, etc.

Characteristics of flame retardant cable, halogen-free cable and fire-resistant cable:

1. Power cables

Flame-retardant cables (ZA, ZB, ZC): effectively retard the spread of flame and prevent the expansion of fire. Due to its low cost, it is widely used in fire-resistant cables. Whether it is a single cable or a bundle of cables, when the cable burns, the spread of flame can be controlled within a certain range, thus avoiding major disasters caused by fire and improving the fire safety of cable lines.

2. Power cables

Halogen-free cable (wdz): low smoke halogen-free cable does not contain halogen materials, low combustion corrosion and toxicity, generating a small amount of smoke, reducing damage to personnel, instruments and equipment, which is conducive to timely fire rescue. Although it has good flame retardancy, corrosion resistance, low smoke concentration, etc., but its mechanical and electrical properties are slightly lower than ordinary cables.

3. Power cables

Fire-resistant cable (n, NH): its function is to maintain normal operation for a certain period of time and to maintain the integrity of the line. Refractory cables produce less acidic gas smoke when burning, and their fire resistance and flame retardancy are greatly improved. Especially during the burning process, the cable can still maintain the integrity of the line operation, accompanied by water spray and mechanical shock.

SAF Coolest v1.2 设置面板VZDSS-ZPBT-EQAWE-ASQ

图片ALT信息： Yunnan Qianlie Cable Co., Ltd.

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