The electrical installation is an invisible but critically important element of every house. A well-designed electrical installation is an investment for decades. It's worth understanding the basic principles before meeting with the electrician.

Key Components of Home Electrical Installation

Main Service Panel

Power flows from the street through the main connection to the service panel. This is where measurement (meter) and main protection are located.

Distribution Board

The internal distribution point divides power into individual circuits. This is where MCBs, RCDs, and surge protectors are located.

Circuits

Each cable run from the distribution board to sockets/lights. A typical house has 15-30 circuits.

Current Standards and Regulations

In most countries, installations must comply with national electrical codes. Key requirements typically include:

TN-S or TN-C-S earthing system
Protective equipotential bonding in bathrooms
RCD protection with ≤30mA for socket circuits

How Many Circuits Does a House Need?

Minimum recommendations:

Lighting: 1 circuit per floor (more recommended)
Sockets: 6-8 sockets per circuit
High-power equipment: Separate circuits for oven, hob, washing machine, dryer, dishwasher, EV charger
External circuits: Garden, garage, terrace

When designing with Electro Planner, you can quickly plan the right number of circuits for your home. The app suggests the number of circuits based on room area and intended equipment.

Electrical Installation in a Single-Family Home | Complete 2026 Guide