House wiring should be planned based on the room layout, number of electrical points, appliances and available electricity supply capacity.
Proper planning helps create an electrical system that is organized, easier to inspect and protected appropriately for each circuit.
If you require a new installation or renovation work, see our electrical wiring services.
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Planning House Wiring
House wiring should be planned before the walls, ceilings and interior finishes are completed. This allows cable routes and electrical point locations to be determined more accurately.
Important items to plan include:
- Light and fan point locations
- Number of switches and 13A socket outlets
- Dedicated points for air conditioners and water heaters
- DB box location
- Cable routes through walls or ceilings
- Wiring requirements for kitchens and high-power appliances
- Additional wiring requirements for future renovation
The number of electrical points should be planned according to how each room will be used, reducing the need for excessive extension sockets.
Types of House Wiring
Two commonly used methods are surface wiring and concealed wiring. The appropriate method depends on the condition of the house, renovation scope and preferred finish.
Surface Wiring
Surface wiring is installed along the surface of walls or ceilings using suitable conduit or trunking. This method makes the wiring easier to inspect and modify in the future.
Concealed Wiring
Concealed wiring is installed within walls, ceilings or related structures. It provides a cleaner appearance, but the cable routes must be planned before plastering and finishing work is completed.
The appropriate method should be selected according to the building structure, cable routes and permitted scope of work.
Electrical Points and Circuit Distribution
Electrical points should not be connected to a single circuit without considering the type and load of the equipment. Lights, socket outlets and certain appliances should be distributed across suitable circuits.
Electrical points commonly planned for a house include:
- Light points
- Fan points
- 13A socket outlets
- Air conditioner points
- Water heater points
- Exhaust fan points
- Kitchen appliance points
- Autogate or outdoor equipment points
High-power appliances may require dedicated circuits, suitable cable sizes and electrical protection based on the equipment specifications.
DB Box and Electrical Protection
The distribution board, commonly called a DB box, distributes the electricity supply to circuits throughout the house. Protective devices within the DB box help disconnect the supply during conditions such as overcurrent, short circuits or current leakage.
Components may include:
- Main switch
- MCB
- RCCB or RCBO
- Surge Protection Device where required
- Neutral bar and earth bar
The type and rating of each protective device should match the circuit design, cable size and electrical load. A higher rating should not be selected without considering these requirements.
1 Phase or 3 Phase Electricity Supply
A house may use a 1 Phase or 3 Phase electricity supply depending on its supply capacity and electrical load requirements.
- 1 Phase – commonly used for homes with standard electrical load requirements
- 3 Phase – used when the electrical load and installation requirements are higher
A decision to use or upgrade to 3 Phase should be made after assessing the electrical load and condition of the existing system.
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House Wiring Mistakes to Avoid
Wiring that is poorly planned or installed can cause frequent electrical trips, equipment damage and safety risks.
Common mistakes to avoid include:
- Using cables that are unsuitable for the electrical load
- Connecting too many points to one circuit
- Making untidy or unsuitable cable connections
- Installing protective devices with unsuitable ratings
- Not providing dedicated circuits for certain appliances
- Ignoring the earthing system
- Not inspecting and testing the installation after completion
Electrical wiring work involves the risk of electric shock and fire. It should be carried out by a contractor or competent person with the appropriate registration and qualifications.
New Wiring or Rewiring an Older House
New wiring is normally carried out for a newly constructed house or during a major renovation. Electrical points and circuit distribution can be planned according to the new layout.
Rewiring involves replacing part or all of an older wiring system. The scope depends on the condition of the cables, accessories, DB box and findings from an inspection of the existing installation.
For general cost information, refer to our house electrical wiring cost guide.
Registered Electrical Contractor
We are a registered electrical contractor with the Energy Commission (Suruhanjaya Tenaga) providing house wiring services in Selangor and Kuala Lumpur.
The scope of work may include:
- Site inspection
- Planning electrical points and cable routes
- Installing wiring and electrical accessories
- Installing or arranging the DB box
- Inspecting and testing electrical circuits
- Repairing problems identified in the installation
Before appointing a contractor, check the proposed scope of work, installation specifications and relevant registration.
House Wiring Frequently Asked Questions
When is new house wiring required?
New wiring is normally required for a newly built house, renovation or additional electrical points. Rewiring may be considered when the existing system is damaged, unsafe or no longer suitable for current usage.
Which is better, surface or concealed wiring?
Both methods can be used. The appropriate option depends on the house structure, preferred finish, access to cable routes and renovation scope.
Does every appliance require a dedicated circuit?
Not every appliance requires a dedicated circuit. However, equipment such as air conditioners, water heaters and other high-power appliances may require dedicated circuits and suitable protection.
Can I do house wiring myself?
Electrical wiring involves the risk of electric shock, short circuits and fire. Installation, inspection and testing should be carried out by an electrical contractor or competent person with the appropriate qualifications.
Need House Wiring Services?
We provide electrical wiring for newly built homes, renovation, additional electrical points and rewiring of older systems in Selangor and Kuala Lumpur.
📲 WhatsApp us for house wiring services in Selangor and Kuala Lumpur.