KNX/EIB 1-pair cable is a communication cable designed for building automation systems, consisting of a single twisted pair of solid copper conductors (typically 1 × 2 × 0.8 mm) with PVC, LSZH & PE insulation, color-coded cores for easy identification, and an aluminium/polyester foil shield with drain wire to ensure reliable signal transmission and protection against interference; it is finished with a distinctive green sheath (RAL 6018) for compliance with KNX standards, offering flame-retardant and halogen-free options for safe indoor use, as well as UV-resistant versions for outdoor installations, making it ideal for applications such as lighting, HVAC, security, and smart home control.