FLRY-B

FLRY-B automotive cable is the standard wiring solution across the European heavy vehicle sector. In the truck workshop and across the trailer industry, this cable type forms the backbone of vehicle electrical installations. Whether the application involves fitting lighting to a new trailer, repairing damaged wiring on an HGV, or connecting electrical systems to a semi-trailer, FLRY-B provides the technical characteristics required for reliable performance in demanding transport environments.

The designation FLRY refers to a specific construction in which the conductor consists of a large number of fine copper strands twisted together. This construction delivers a high degree of flexibility, which is essential in vehicle applications. Cables installed in trucks and trailers are continuously subject to vibration, mechanical stress and movement from flexing connections. A fine-stranded conductor accommodates these movements far better than a solid or coarse conductor, significantly reducing the risk of conductor fatigue or breakage over the service life of the vehicle. This is particularly relevant in trailer applications, where the electrical connections between tractor and trailer are regularly coupled and uncoupled.

The insulation of FLRY-B cable is a thin-walled plastic sheathing engineered to withstand a wide temperature range. This is directly relevant to the operating conditions found in vehicles. In proximity to engines, exhaust components, braking systems and other heat sources, temperatures can vary substantially. The insulation retains its electrical and mechanical properties under prolonged exposure to heat and cold, which is a requirement in HGV applications where cables are routed through engine bays, underfloor sections and exposed trailer frames.

In trailer construction, FLRY-B is used for a wide range of electrical functions. These include wiring for rear lights, side markers, licence plate lighting and outline markers. Internal wiring for electric landing legs, ABS systems, EBS modules and other electronic components now standard on modern semi-trailers is also realised using this cable type. Colour coding of individual conductors serves a practical purpose in this context. Wiring diagrams for vehicles and trailers use colour to identify conductor function directly, reducing diagnostic time and wiring errors during assembly or repair.

For the truck workshop, the availability of FLRY-B on reels is a practical necessity. Wiring repairs rarely require a fixed cable length. Purchasing cable by the metre or by the reel allows the technician to cut exactly the required length, minimising waste and ensuring the right specification is used for each application. This applies equally to small repairs on a single damaged conductor and to larger projects involving complete electrical installations or conversions.

FLRY-B is available in multiple cross-sections, each suited to a specific range of current-carrying applications. Smaller cross-sections such as 1.5 mm² are used for signal wiring and lighting circuits, while 2.5 mm² is appropriate for slightly higher loads such as supply lines feeding multiple lighting groups or auxiliary components. Larger cross-sections are used where higher currents must be carried, for example in motor control or actuator supply circuits. Selecting the correct cross-section requires a technical assessment based on maximum current, cable run length and ambient temperature conditions.

In the truck and trailer sector, FLRY-B cable is the daily working material for trailer manufacturers assembling new semi-trailers, for bodybuilders equipping vehicles with electrical installations and for workshops carrying out repairs or modifications on existing HGV fleets. Its combination of flexibility, temperature resistance and broad availability across colours and cross-sections makes it the reference cable type for professional electrical work on heavy vehicles and trailers.