The EPBD's focus on existing buildings means that the biggest market for smart lighting is not new construction, but retrofit projects. However, upgrading older buildings presents a unique challenge: working within existing, often congested, infrastructure. This is where advanced KNX cable design becomes a game-changer.
The Problem with Traditional Cables
Standard KNX cables typically have an outer diameter of 8.0mm. In a retrofit scenario, trying to pull a stiff, thick cable through decades-old, already-packed conduit is often impossible without invasive and expensive structural work. This creates a significant barrier to EPBD compliance for older buildings.
The Slim-Profile Solution
Next-generation KNX bus cables address this challenge with a reduced outer diameter of just 6.2mm–6.3mm. This seemingly small difference has a massive impact:
- Higher Fill Capacity: Electricians can now pull multiple KNX cables through existing conduits where only one would fit before.
- Reduced Conduit Wear: The smaller diameter reduces friction during pulls, minimizing the risk of getting stuck or damaging the conduit lining.
- Minimal Disruption: Because the cables are easier to install, retrofit projects can be completed with less downtime for building occupants-a critical factor for commercial spaces like offices and hotels.
Built for the Long Haul
In retrofit projects, the reliability of the cable is paramount, as replacing a failed cable inside a closed wall is prohibitively expensive. High-quality KNX cables are constructed with robust jackets (often LSZH-Low Smoke Zero Halogen) that resist environmental degradation. Combined with the mechanical protection offered by the stranded core, these cables ensure that the EPBD-mandated smart lighting system remains operational for the entire lifecycle of the building.