What Cable for Electrical Installation? Complete Wiring Guide

Walking into an electrical wholesaler can be overwhelming with the variety of cable types available. Choosing the right cable is crucial for the durability and safety of your installation. What cable should you choose for a single-family home?

Basic Cable Designations

In concealed installations, various cable types are used depending on your region. Common types include:

• Solid copper conductors: Best for fixed installations in walls.
• PVC insulated: Standard insulation type for domestic use.
• Flat cables: Easier to install in plaster.

Flexible cables (stranded conductors) are used for extension cords but should never be permanently installed in walls!

What Cable Size Where?

• Lighting: 3-core 1.5mm². Always use 3-core cable (even for single switches) to maintain protective earth continuity.
• Sockets: 3-core 2.5mm². Provides adequate current-carrying capacity for typical household devices.
• Induction hob: 5-core 2.5mm² (for 3-phase installation).

Wire Colors Matter

Never ignore the colors!

• Green/Yellow: Protective Earth (PE) – ALWAYS and ONLY for protection.
• Blue: Neutral (N).
• Brown/Black/Grey: Live/Phase (L).

In Electro Planner, you can easily calculate the total cable lengths needed by type, making purchasing and cost estimation simple.