Full Rewiring for 25-Year-Old Home in Kajang

The Client's Situation

The homeowner, Mr. Azman, contacted us after experiencing repeated circuit breaker trips and noticing a faint burning smell near the kitchen power outlets. His double-storey terrace house in Kajang was built in 2001 and had never undergone any electrical upgrades since the original construction. With three air-conditioners, an electric water heater, an induction cooker, and a growing collection of electronic devices, the 25-year-old wiring was struggling to keep up.

During a phone consultation, Mr. Azman mentioned that he'd been relying on multiple extension cords in almost every room because there weren't enough power points. He also noted that his TNB bill had been creeping up despite no major changes in usage—a telltale sign of current leakage from deteriorating wiring insulation.

What We Found During Inspection

Our initial site inspection revealed several concerning issues:

• Original single-phase 40A supply that was insufficient for the household's current electrical load
• Degraded PVC insulation on wiring in the roof space, crumbling to the touch due to years of heat exposure
• Undersized 1.5mm² cables supplying power outlets that now supported air-conditioners and heavy appliances
• Missing earth connections on several outlets in the kitchen and bathrooms
• An outdated DB panel with only 8 ways and no RCCB (earth leakage) protection
• Scorch marks on two kitchen outlets indicating overheating and arcing

The insulation resistance test confirmed our concerns—readings in the kitchen and master bedroom circuits were well below the acceptable threshold, meaning current was leaking through the degraded insulation. This was both a fire risk and the likely cause of Mr. Azman's unexplained TNB bill increases.

Our Rewiring Solution

We proposed a complete rewiring of the entire home, including upgrading the TNB supply from single-phase to three-phase. Here's the scope of work we carried out over four days:

Day 1: DB Panel Upgrade & Main Supply

We started by coordinating with TNB to upgrade the supply to a 60A three-phase system. The old 8-way DB panel was removed and replaced with a brand new 18-way panel featuring individual MCBs for each circuit, a 63A RCCB for earth leakage protection, and a dedicated 40A MCB for the air-conditioning circuits.

Day 2-3: Full Rewiring

Our team systematically rewired the entire house, running new 2.5mm² cables for power outlets and 4.0mm² cables for high-load appliances like the air-conditioners and water heater. We installed new PVC conduits throughout the roof space and within walls where accessible. Each room received additional power points based on modern usage requirements—the kitchen alone went from 4 outlets to 10.

Day 4: Testing, Commissioning & Cleanup

The final day was dedicated to thorough testing of every circuit. We performed insulation resistance tests, earth continuity tests, and load tests on all circuits. Every outlet and switch was verified for correct wiring polarity. After passing all tests, we cleaned up the work area and walked Mr. Azman through the new system.

Results

Client Testimonial

"I should have done this years ago. The difference is night and day. No more tripping, no more burning smells, and I can finally run the air-con and the washing machine at the same time without worrying. The team was very professional—they explained everything clearly and finished on schedule. My TNB bill also dropped, which was a nice bonus. Thank you, Prime Electrician!"

— Mr. Azman, Homeowner, Taman Kajang Perdana

This project is a good example of why older homes in Kajang and across Selangor need regular electrical inspections. Similar to the wiring issues we resolved in Subang Jaya and the electrical hazards we uncovered in Petaling Jaya, homes built in the late 1990s and early 2000s are now reaching the age where full rewiring becomes necessary for safety and reliability.