Changing a Consumer Unit with Prometheus Electrical

Dec 25, 2023


Welcome to Prometheus Electrical, your go-to resource for all your lighting fixtures & equipment and electrician needs. Today, we'll guide you through the process of changing a consumer unit, providing you with detailed instructions and safety precautions. Trust us to deliver high-quality electrical services for your residential or commercial setting.

Why Change a Consumer Unit?

Consumer units, also known as fuse boxes or distribution boards, play a crucial role in safely distributing electricity within a building. Over time, consumer units may become outdated or insufficient to handle modern electrical loads. Upgrading to a new consumer unit enhances safety, improves electrical performance, and allows for future expansions or modifications.

The Importance of Professional Assistance

Before diving into the process, it is essential to emphasize the importance of hiring a professional electrician for any electrical work, including changing a consumer unit. Electrical systems can be complex and hazardous, requiring expert knowledge and experience. By engaging Prometheus Electrical, you can ensure a safe and efficient consumer unit replacement, giving you peace of mind.

Step-by-Step Guide: Changing a Consumer Unit

Step 1: Preparing for the Task

Before starting the consumer unit replacement, make sure to gather all the necessary tools and equipment. This may include a new consumer unit, appropriate cables, screwdrivers, pliers, wire strippers, and safety gear such as gloves and goggles.

Step 2: Switch Off the Power

Safety should always be the top priority when working with electrical systems. Begin by turning off the main electrical supply to avoid any potential risks. Locate the main switch or circuit breaker and switch it off. Remember, if you are unsure about any part of this process, contact Prometheus Electrical for professional assistance.

Step 3: Removing the Old Consumer Unit

Carefully remove the front cover of the old consumer unit. Inside, you will find a series of fuses or circuit breakers. Take a picture or note the existing wiring connections as a reference for the installation of the new unit. Carefully disconnect the wires one by one, ensuring that they do not touch each other or any exposed metal parts.

Step 4: Installing the New Consumer Unit

Now it's time to install the new consumer unit. Follow the manufacturer's instructions provided with the unit for specific guidance. Begin by connecting the main incoming cables to the corresponding terminals. Make sure each wire is securely tightened using the appropriate screws or connectors. Continue by attaching the individual circuits to their respective terminals, using proper labeling for identification.

Step 5: Testing and Certification

Once the new consumer unit is installed, it's crucial to test its functionality and ensure its compliance with electrical safety regulations. This step requires the expertise of a professional electrician who can perform a series of tests, including insulation resistance, fault loop impedance, and correct functioning of residual current devices (RCDs). Upon successful testing, Prometheus Electrical will provide you with the required certification for your peace of mind.


Congratulations! You have successfully learned about the process of changing a consumer unit. At Prometheus Electrical, we prioritize your safety and provide top-notch electrical services. By following our step-by-step guide and utilizing our professional expertise, you can effortlessly upgrade your electrical system. Contact us today at and experience exceptional service that puts your electrical needs first.