Malaysia’s electrical wiring system has three things must know: external, internal, and three-phase. TNB installs external wiring to carry power from the 3-phase supply outside the house. External wiring costs vary depending on the type of house unit and connection cable used. Internal wiring, on the other hand, is the wiring that runs throughout the house to distribute power lines and can cost up to RM10,000. The process can take up to two weeks depending on the wiring plan, while upgrading the external wiring can be completed in a day.

Electrical wiring systems are complex networks of cabling and electrical devices. Some houses have lighting fixtures and three-phase power. These systems are complicated, but they are required because they provide power to devices and appliances. The wiring diagrams may appear complicated, but understanding them will make working with them easier. Let’s look at the different types of electrical wiring in Malaysia. You’ll see how they’re organised and what they’re all for