Electric Distribution Board

An electric distribution board, also known as a panelboard, circuit breaker panel, breaker panel, electric panel, fuse box, or DB box, is an essential component in the electricity supply system that distributes an electrical power feed into subsidiary circuits. It provides a protective fuse or circuit breaker for each circuit within a common enclosure. This system is fundamental to the electric power distribution network, ensuring safe and efficient energy allocation throughout a building or facility.

Components and Functionality

Typically, a distribution board includes a main switch, and in modern variants, one or more residual-current devices (RCDs) or residual current breakers with overcurrent protection (RCBOs). These devices are crucial for protecting the circuit by interrupting the flow of electricity when a fault is detected, thus safeguarding against electrical fires and electric shocks.

Main Switch

The main switch, also referred to as an incomer, is responsible for controlling the phase and neutral lines of the entire supply. It acts as the primary control point for the entire electrical network within the premises and is designed to handle high current ratings.

Circuit Breakers and RCDs

Circuit breakers and RCDs mounted on DIN rails are the backbone of modern distribution boards, especially those dealing with supplies ranging up to approximately 100 A in consumer units or 200 A in larger distribution boards. They play a pivotal role in isolating faulty circuits and preventing potential hazards.

Types of Distribution Boards

Distribution boards vary in design and capacity, tailored to meet the specific needs of residential, commercial, and industrial applications.

Consumer Units

In the United Kingdom, a distribution board designed for domestic installations is commonly known as a consumer unit. These units are typically used in residential settings to manage and protect the electrical circuits.

Installation and Safety

Proper installation and maintenance of distribution boards are critical for the safety and reliability of the electrical supply. They should be installed by qualified electricians following local electrical codes and regulations to ensure compliance and safety.