Electrical Safety Inspection for Terrace House

The Problem

Mr. and Mrs. Lim had lived in their Kepong terrace house for over 15 years without ever having their electrical system professionally inspected. The house, built in the early 2000s, had seen multiple DIY modifications by previous owners and showed signs of electrical strain.

Their concerns began when they noticed their lights occasionally flickering during rainstorms, and their washing machine kept tripping the kitchen circuit breaker. With two young children in the house, they decided it was time for a professional safety inspection before minor issues became major hazards.

Initial Assessment

Upon arrival at the Taman Sri Segambut property, our licensed electrician began with a client consultation to understand their concerns and electrical usage patterns. The Lims had added several new appliances over the years — air fryers, a larger refrigerator, and additional air conditioning units — without considering whether the original wiring could handle the increased load.

Our inspection protocol covered every aspect of their electrical installation, from the TNB meter to the last power socket.

Key Findings

1. DB Box Issues

The distribution board revealed several immediate concerns:

• Two MCBs were showing signs of overheating with discoloration around the terminals
• The ELCB had a slow response time during testing, taking over 40 milliseconds to trip (should be under 30ms)
• Several circuits were incorrectly labeled, making future troubleshooting difficult
• Evidence of water ingress from previous roof leaks had caused minor corrosion on some terminals

2. Wiring and Circuit Issues

The cable inspection uncovered:

• The kitchen circuit was severely overloaded, drawing near its maximum rated capacity with normal daily use
• A DIY extension added by a previous owner used undersized cable (1.5mm² instead of required 2.5mm²) for a new power socket
• Several junction boxes hidden in the ceiling contained loose wire nuts that showed signs of arcing
• The water heater circuit lacked proper earth bonding

3. Power Socket and Switch Defects

Our socket testing revealed:

• Three sockets had reversed polarity (live and neutral swapped), creating a shock hazard even when appliances were switched off
• One outdoor socket had a cracked faceplate allowing water ingress
• Two bedroom switches had loose mounting and arcing sounds when operated

4. Earthing System Deficiencies

The earth resistance test showed a reading of 18 ohms — nearly double the recommended maximum of 10 ohms for residential properties. The earth electrode had likely degraded over time, and the bonding connections to metal water pipes were corroded.

The Solution

We provided the Lims with a comprehensive report categorizing all findings by severity and a detailed quotation for remedial work. They opted to proceed with all recommended repairs.

Immediate Actions (Same Day)

• Replaced the faulty ELCB with a new 63A 30mA model with proper response time
• Replaced two overheated MCBs
• Corrected the three sockets with reversed polarity
• Disconnected the dangerous DIY extension until proper rewiring could be completed

Circuit Rewiring and Upgrades

• Added a dedicated 20A circuit for the kitchen to handle the refrigerator, washing machine, and countertop appliances
• Replaced the undersized DIY extension with proper 2.5mm² cabling
• Replaced all three arcing junction boxes with properly secured terminal blocks
• Installed proper earth bonding to the water heater and bathroom fittings

Earthing System Upgrade

• Installed a new earth electrode and chamber
• Replaced corroded bonding connections
• Added supplementary bonding to metal window frames
• Final earth resistance reading: 4.2 ohms (excellent)

Final Touches

• Replaced cracked outdoor socket with IP-rated weatherproof unit
• Secured all loose switches with proper mounting boxes
• Re-labeled all circuits in the DB box for clarity
• Installed surge protection at the main incoming supply

The Result

The comprehensive safety inspection and remediation transformed the Lims' electrical system from a collection of hazards into a safe, modern installation that meets current Malaysian electrical regulations.

Since the work was completed:

• No more flickering lights during storms
• Kitchen appliances run without tripping breakers
• Peace of mind knowing their children are safe from electrical hazards
• Property value increased with proper electrical certification