23 Jun 2026
Most electrical cables in homes are installed inside walls to keep the installation neat, safe, and protected from external disturbances. Because they are hidden from view, many people assume the cables will always remain in good condition.
In reality, household cables also have a service life. If the cable quality is poor, the installation is not carried out according to standards, or the cable is used beyond its capacity, its condition can gradually deteriorate over time.
The good news is that cable damage usually does not happen suddenly. There are several common causes and warning signs that can be recognized early.
Why Can Electrical Cables Inside Walls Get Damaged?
Some of the most common causes include:
1. Cable Aging
Over time, the cable insulation can become hard or begin to crack due to heat and the natural aging process. As a result, its insulating performance gradually decreases.
2. Excessive Electrical Load
If too many electrical appliances are connected to the same circuit, the power cable has to work harder and generates more heat. Over the long term, this condition can accelerate cable deterioration.
3. Poor Cable Connections
Loose cable connections can create heat at certain points. If left unattended, these areas are more likely to become damaged than the rest of the cable.
4. Damp Walls
Water seepage or high humidity can affect the condition of the cable insulation, especially if the electrical installation is not properly protected.
5. Damage from Drilling or Nails
During home renovations, cables hidden inside walls can accidentally be hit by drills, nails, or other sharp objects.
What Are the Signs That a Cable Inside the Wall May Be Faulty?
Because the cable is hidden inside the wall, damage is usually indicated by the following symptoms:
- Lights flicker frequently.
- The circuit breaker (MCB) trips repeatedly.
- Power outlets or switches feel warm.
- A burning plastic smell is noticeable.
- Part of the house suddenly loses power.
- Burn marks or discoloration appear on outlets or switches.
If any of these signs begin to appear, the electrical installation should be inspected as soon as possible to prevent the problem from becoming more serious.
What Should You Do?
If an electrical cable inside the wall is suspected to be faulty:
- Reduce the use of electrical appliances on the affected circuit.
- Turn off the power if you notice a burning smell or signs of excessive heat.
- Do not dismantle the electrical installation yourself unless you have the necessary expertise.
- Ask a qualified electrician to inspect the installation and identify the source of the problem accurately.
How Can You Prevent It?
Several simple steps can help extend the service life of household electrical cables.
- Use high-quality cables that comply with applicable standards.
- Choose the correct cable size based on the required electrical load.
- Make sure the installation is carried out properly.
- Avoid adding electrical loads beyond the installation's capacity.
- Keep a record of the cable routing to prevent accidental drilling or nailing during future renovations.
Maintaining an electrical installation is actually quite simple. By choosing the right building cables, installing them according to standards, and using them within their intended capacity, the cables can last for decades.
