Cable Selection Guide For High Temperatures In Saudi Arabia: Key Considerations In Materials And Current Carrying Capacity

When carrying out engineering projects in Saudi Arabia, extreme temperatures are a core challenge that must be faced when selecting and laying cables. Summer temperatures here often exceed 50°C, and the surface temperature is even higher. At night or in specific areas, the temperature difference is huge. Such a harsh environment poses a direct threat to the cable's insulation material, current-carrying capacity and long-term reliability. Improper selection will not only lead to frequent failures and high maintenance costs, but may also cause safety accidents. Understanding the specific effects of high temperatures on cable performance is the first step in ensuring stable operation of power and communications systems.

How extreme heat affects cable insulation material performance

In Saudi Arabia, insulating materials such as PVC and XLPE commonly used in cables will accelerate aging if they are exposed to high temperatures for a long time. Under high temperature conditions, the molecular chains of insulating materials will break, causing the material to become hard and brittle, lose elasticity, and reduce the insulation resistance. For example, when PVC continues to be at high temperatures, the plasticizer will evaporate, which may cause it to crack within a few years. However, in temperate areas, the life of the same cable may be as long as twenty or thirty years.

Except for the material itself, high temperature environments will significantly reduce the current carrying capacity of the cable. The resistance of a conductor increases as the temperature increases. When the same current is passed through, more heat will be generated, thus forming a vicious cycle. When designing, it must be calibrated according to the local maximum ambient temperature. Generally speaking, insulation materials with higher temperature levels need to be selected, such as 90°C or 125°C, and sufficient derating factors must be considered to prevent the cable from being damaged due to overheating when operating at full load.

What are the specific criteria for selecting high-temperature cables in Saudi Arabia?

The selection of cables, for those suitable for Saudi Arabia, must be strictly in accordance with international and local standards. International standards, such as IEC 60502, IEC 60287, etc., provide a framework for cable design and testing under high temperature conditions. However, what is more critical is to comply with the mandatory requirements of the Saudi Standardization Organization, also known as SASO, such as SASO IEC 60502-2. These standards often incorporate local extreme climate conditions and have more specific provisions for fire protection, UV protection and heat resistance.

When making actual purchases, you should focus on paying attention to the technical parameters of the relevant cables. Rated temperature is a key indicator, and you must choose a model that is higher than the historical highest temperature in the location where the project is located. At the same time, the sheath material must be able to withstand direct ultraviolet rays and sand and dust abrasion. The low smoke and halogen-free, or LSZH, properties are particularly important in confined spaces. In terms of certification, in addition to SASO, looking for products with GCC or from well-known international certification agencies such as UL and VDE can add an extra layer of quality assurance.

What are the special precautions for cable laying construction in desert areas?

When carrying out cable laying work in desert areas, the selection of construction time is very critical. Try to avoid doing work at noon when the temperature is the highest every day. This is because high temperature will not only affect the safety of construction workers, but also may cause the cable skin to become soft, making it more susceptible to damage when laying by traction. It is suitable to choose the early morning or evening time for construction, and take necessary shading and cooling measures.

The laying method must be carefully designed according to the environment. In the case of direct burial, the burial depth must be sufficient to prevent the conduction of extremely high temperatures on the surface, and special sand must be used to backfill to reduce thermal resistance. When laying in bridges or pipes, be sure to ensure good ventilation to prevent heat accumulation caused by dense accumulation of cables. The paths of all cables laid outdoors should be kept away from areas exposed to long-term direct sunlight as much as possible, or physical shielding measures such as covering with shields should be adopted.

How to maintain and inspect cable systems in extreme temperature environments

In that kind of extreme temperature environment, preventive maintenance is even more important. A regular infrared thermal imaging inspection plan should be established, and thermal imaging cameras should be used to scan cable joints, terminals and densely laid areas, so that abnormal hot spots caused by poor contact or overload can be discovered in a timely manner. Such a non-contact detection can provide an early warning before a failure occurs, thereby avoiding unplanned downtime.

At the same time, it is necessary to regularly check the condition of the cable sheath and insulation. The synergistic effect of high temperature and sand and dust will aggravate the wear and aging of the outer sheath. Check whether there is cracking, hardening, discoloration or bulging. For key lines, insulation resistance and dielectric loss angle tangent (tanδ) tests can be carried out on a regular basis, and the overall aging condition of the insulation material can be evaluated by monitoring its changing trends, thereby providing data support for replacement.

What are the challenges of extreme temperature differences on cable joints and terminals?

The temperature difference between day and night is extremely large in many areas of Saudi Arabia. This cycle of thermal expansion and contraction is a severe test for cable accessories. The expansion coefficients of different materials (such as metal, rubber, and ceramics) in joints and terminal heads are different. Under repeated thermal stress, small gaps or separations are prone to occur at the interface, resulting in partial discharge and eventually breakdown. Therefore, it is necessary to choose cold-shrinkable or prefabricated joints specially designed for a wide temperature range.

In this link, construction technology plays a key role. When performing installation operations, be sure to strictly follow the instructions given by the manufacturer and ensure that the operation is carried out under the appropriate temperature conditions to ensure that the interface can remain clean and sealed. For example, if a cold shrink joint is installed when the temperature is too high, there may be excessive pre-expansion. However, if it is installed when the temperature is too low, there may be a problem of insufficient shrinkage. After the joint is completed, mechanical protection and sun protection measures should be taken, and monitoring should be strengthened during the initial stage of operation.

What new technologies will improve the reliability of high-temperature cables in the future?

New solutions have emerged with the advancement of material science, such as new insulation materials based on thermoplastic polyolefins, also known as TPO, or improved cross-linked polymers such as ultra-clean XLPE. This material can significantly improve the heat resistance level and enhance aging resistance while maintaining electrical properties. There are also some nanofillers, such as nanosilica, which can improve the thermal stability and mechanical strength of the material.

Intelligent monitoring is another development direction. "Smart cables" integrated with optical fiber temperature sensors can monitor the temperature distribution at every point along the entire line in real time and continuously to achieve accurate hot spot positioning and load management. In addition, more advanced simulation tools can combine the meteorological data of Saudi Arabia's specific geographical locations to carry out thermal field simulations for the cable laying plan, predict its long-term operating temperature during the design and planning stages, and then optimize the selection and layout, fundamentally improving the reliability of the system in extreme environments.

For those of you in Saudi Arabia who are involved in energy projects, construction projects or industrial projects, what are the practical difficulties that trouble you most in the design, procurement and operation and maintenance of cable systems? I also hope to share your experience or questions in the comment area. If you think this article has reference value, please feel free to like and share it.