The key to the length of cable life lies in it, did you know?
Cables are flammable, and the string ductility after a fire will lead to severe consequences. Fire accidents occur from time to time in winter, and fire protection is highly valued. It is still necessary to discuss the problems in cable fire protection.
The service life of the cable directly affects the safety of production. The service life of the line is determined by the oxidation induction period of the sheath material. Generally, the line is designed to be used for 20 years, but the general family's actual service life is far greater than this value. We need to pay attention to the following points at any time, which are fatal to the cable:
External force damage
Judging from the operation analysis in recent years, especially in today's rapid economic development, a considerable number of cable failures are now caused by mechanical damage.
Insulation is damp
This situation is also prevalent and generally occurs at the cable joints in direct burial or piping. For example, unqualified cable joints and joints made in humid weather conditions will cause water or steam to enter the joints. Over time, water branches will form under the electric field's action, which will gradually damage the insulation strength of the cable and cause failures.
The cable is directly buried in the area with acid and alkali, which will often cause the cable armor, lead skin, or outer sheath to be corroded. The protective layer suffers from chemical corrosion or electrolytic corrosion for a long time, failing the protective layer and reducing insulation. The cable is faulty. Chemical: The company's cable corrosion is quite severe.
Long-term overload operation
Overload operation, due to the thermal effect of the current, the conductor heating will inevitably be caused when the load current passes through the cable. Simultaneously, the charge's skin effect, the recent eddy loss of the steel armor, and the insulation loss will also generate additional heat, which will increase the cable's temperature. During long-term overload operation, excessively high temperature will accelerate the insulation's aging, and even the insulation will be broken down. Especially in the hot summer, the cable's temperature rise often leads to the first breakdown of the inadequate insulation of the line, so in the summer, there are more cable faults.
Cable connector failure
Cable joints are the weakest link in the cable line, and joint cable failures caused by direct faults (poor construction) by personnel often occur. In the process of making cable joints, if there are original nets such as insufficient joint crimping, low heating, etc., the insulation of the cable head will be reduced, which will cause an accident.
Environment and temperature
The cable's external environment and the heat source can also cause the cord to overheat, insulation breakdown, and even explosion and fire.
Other reasons such as the normal aging of the cable body or natural disasters.