We are currently on-site at a new build property in Truro, Cornwall, carrying out a comprehensive first fix electrical installation. This crucial stage involves installing all the cabling and back boxes within the timber frame structure, laying the essential groundwork for lighting, power, and data systems before the plasterboarding begins.
The first fix represents the foundational stage of any domestic electrical installation, particularly within a new build project like this one in Truro. It is the phase where the electrical blueprint of the home transitions from paper plans into a physical network of cables, circuits, and mounting boxes, all concealed within the building’s structure. Before any plasterboard is fitted, our work involves meticulously laying out the entire electrical nervous system that will eventually power the home. This process demands foresight and precision, as every cable run and box placement directly impacts the functionality and convenience of the finished space.
A successful first fix begins long before the first cable is cut. It starts with detailed discussions with the client and collaboration with the main contractor to establish a definitive electrical layout. We determine the precise locations for every socket, light switch, light fitting, and data point. This planning phase also considers the demands of specific areas, such as the kitchen, which requires dedicated circuits for high-power appliances like ovens and induction hobs. We also account for external requirements, such as outdoor lighting, power to a shed or garage, and provisions for future installations like electric vehicle charging points. By finalising these details early, we establish a clear roadmap for the installation.
With the plans confirmed, the physical installation begins. In this timber-framed property, we route cables through drilled holes in the joists and studs, adhering to strict guidelines that maintain the structural integrity of the frame. Different circuits require specific cable types; for instance, 1.5mm twin and earth cable is typically used for lighting circuits, while 2.5mm is standard for ring final circuits that power the sockets. All cabling is carefully clipped and secured to prevent it from being damaged by other trades or during the subsequent stages of construction. We install back boxes at every planned point for a socket or switch, carefully setting their depth to ensure they will sit perfectly flush with the final plasterboard finish.
One of the key aspects of a first fix on a busy new build site is coordination. We work closely with plumbers, carpenters, and other trades to ensure our installations do not conflict. For example, we must be aware of where pipework for heating and water will be run to avoid drilling through them, and we coordinate the wiring for central heating controls, boilers, and extractor fans. In the bathroom areas, special considerations for wiring in zones are taken into account from this early stage, ensuring all cabling is correctly positioned for any electric showers, heated towel rails, or shaver sockets.
The consumer unit, or fuse box, is the heart of the electrical system. During the first fix, we establish its location and run all the individual circuit cables back to this central point. The tails from the electricity meter position are also prepared, ready for the consumer unit to be fitted and connected during the second fix stage. This methodical approach ensures that when the time comes to make the final connections, the process is efficient and organised. This hidden work is what makes a modern home function safely and reliably, providing the power for everyday life long after the construction is complete.
