Why Do Electrical Cables Get Hot?

When electric current flows through a cable, it naturally generates heat. This is normal as long as the temperature remains within safe operating limits.

However, if the temperature becomes excessive, the condition is known as electrical cable overheating, which can lead to serious damage.

Causes of Hot Electrical Cables

Some common causes include:

• Excessive electrical load
• Cable size too small for the load
• Loose connections
• Low-quality cable materials
• Poor ventilation
• High ambient temperature

What Is Cable Ampacity?

Ampacity is the maximum amount of electrical current a cable can carry without exceeding its safe temperature rating.

The higher the ampacity, the better the cable can handle electrical loads safely.

PVC vs XLPE: Which Is More Heat Resistant?

PVC Cable

• Maximum temperature around 70°C
• Commonly used for residential installations

XLPE Cable

• Maximum temperature around 90°C
• Suitable for industrial facilities and large buildings

Effects of Cable Overheating

If left unaddressed, overheating may cause:

• Damaged insulation
• Shorter cable lifespan
• Lower electrical efficiency
• Fire risk
• Operational downtime

The Importance of Choosing Quality Cables

Selecting cables from a trusted manufacturer is essential.

PT Jembo Cable Company Tbk provides a wide range of power cable solutions with high-quality standards for buildings, industrial facilities, and infrastructure projects.

Conclusion

A warm cable is not always dangerous. However, overheating must be prevented.

Use high-quality cables, proper sizing, and standard-compliant installation practices.