23 Jun 2026
In electrical systems, heat in power cables is a common occurrence, especially when electric current flows. This phenomenon is not unusual, because every electrical cable naturally has internal resistance. In the industry developed by PT Jembo Cable Company Tbk, understanding electrical resistance is a fundamental basis in designing safe and efficient cables, ranging from household cables, industrial cables, to national infrastructure cables.
Why does electrical resistance generate heat?
When electric current flows through a cable, electrons inside the conductor move and “collide” with the metal atoms within the cable. These collisions create resistance.
The energy from the “obstructed” electrical flow is then converted into heat energy. Technically, this is known as the Joule effect, which can be expressed simply as:
P = I² × R
(P = heat power, I = current, R = resistance)
This means that the greater the current or the higher the cable resistance, the more heat will be generated.
Direct impacts on power cables
If the heat appears in normal amounts, this condition is still safe. However, if it becomes excessive, several direct impacts may occur on power cables, such as:
- Significant increase in cable temperature
- Cable insulation begins to soften or degrade in quality
- Reduced electrical transmission efficiency
- Energy loss within the system
In power cables, building cables, industrial cables, and household wiring, this condition can occur when the electrical load is too high or the cable is not suitable for the current capacity.
Long-term impacts on cable systems
If high resistance and heat conditions continue over a long period, the effects can become more serious:
- Damage to cable insulation
- Reduced lifespan of power cables
- Risk of electrical system disturbances
- Potential short circuits in installations
- Decreased reliability of distribution and industrial cables
In large-scale systems such as transmission cables and national infrastructure cables, these effects can impact overall power supply stability.
How to reduce electrical resistance in cables
Electrical resistance cannot be completely eliminated, but it can be controlled to remain safe. Some commonly used methods in the cable industry include:
- Using conductor materials with high conductivity
- Matching cable size with electrical load requirements
- Using cable insulation that is stable against heat
- Ensuring proper electrical cable installation according to standards
- Avoiding overload on low-voltage and household cables
- Choosing high-quality cables from Indonesian cable manufacturers that meet technical standards
With this approach, power cables can operate more stably, efficiently, and safely in various applications, from electrical equipment cables to large-scale industrial cables.
Closing
Electrical resistance is a natural part of every power cable, but its management greatly determines performance and safety. Proper cable selection—whether for household cables, building cables, distribution cables, or transmission cables—helps maintain a stable and long-lasting electrical system, including the use of environmentally friendly cables and modern infrastructure applications.
