Tell me about the main reasons for the problem of fireproof cables in Linyi
There are many causes of problems with Linyi fire resistant cables, and identifying the characteristics and location of fire resistant cable problems is due to the prerequisite conditions. The main causes of fire resistant cable problems can be divided into the following:
Thermal breakdown:
There are mainly several aspects as follows: firstly, the quality of fire resistant cable production is not satisfactory. The insulation layer quality of fire resistant cables generally lies in the production of fire resistant cables. Due to defects in the outer protective layer during production, such as defective folds, cracks, and stacking gaps in the cable sheath; Secondly, the quality of fireproof cable accessories is not up to standard, such as sand holes in cast iron parts, magnetic parts and other equipment that do not meet the specifications and models, etc; Thirdly, the construction of the project is poor, causing damage to the insulation layer of Linyi fireproof cables during transportation and construction; Perhaps it is due to moisture regain in the insulation layer of fireproof cables; Fourthly, the selection of fire resistant cable models and specifications, cable current carrying capacity, and other models during the design process does not comply with actual regulations.
Rotten Candle:
Rotten candles are the key cause of moisture regain in the insulation layer of Linyi fireproof cables, mainly due to two types. One is electric corrosion, where the outer sheath of a fireproof cable laid adjacent to a strong electrostatic field will corrode and regain moisture, thus damaging the insulation layer. The second is organic chemical corrosion. If the laying method of fire-resistant cables is strong acid and alkali working areas, it will cause corrosion, cracking or perforation of Linyi fire-resistant cables and protective sleeves, as well as damage to the insulation layer.
Overtemperature:
The main internal cause of overheating in fire-resistant cables is that the internal structure of the insulation layer of the fire-resistant cable is magnetically dense and the components are overheated, causing carbonization of the insulation layer; The primary external cause is the overload of fireproof cables, which can also lead to an increase in the temperature of fireproof cables, and the temperature will become more significant during summer. In addition, external factors such as excessive temperature can accelerate the embrittlement of the insulation layer of fire-resistant cables, such as poor ventilation of fire-resistant cable equipment in electrical trenches, authentic, threading pipes, or laying detailed addresses close to heating pipelines. Overtemperature can also lead to accelerated aging of the insulation layer of fire-resistant cables.
Mechanical equipment hazards:
Many mechanical equipment hazards are caused by municipal road engineering work such as fire resistant cable equipment, civil engineering projects formed during laying or near the path of fire resistant cables after equipment installation, and pipeline laying. Mechanical equipment hazards are one of the key causes of fire resistant cable problems during operation.
The main reasons for causing damage to fireproof cables include the following:
The adverse effects of other facilities, such as vibration or destructive loads, resulting in dry and cracked protective sleeves for fire-resistant cables; For example, the large short-circuit capacity caused by short-circuit faults in other electrical equipment passes through fire-resistant cables, burns out the electrical conductors of fire-resistant cables, and so on.
Immediate external force harm: During the construction process, the optical cable traction machine is excessively used and bruised; Immediately damaged by external forces (such as earthwork excavation, foundation piling, transportation, etc.); Excessive bending during the laying of fireproof cables can have a serious negative impact on the insulation layer of fireproof cables.