Cable foils

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Cable wraps

Cable foils are a versatile method of marking underground runs of electrical lines. They make it possible to recognize and identify the type of cabling. All professional and standards-compliant underground installation work requires their use. The warning foil, when laid at the right depth and distance above buried infrastructure elements, marks its exact location in case repairs or upgrades are necessary. It concerns both power, gas and water installations. Cable foils are also used for organisation and warning purposes as a kind of ground barrier in case of renovation works and the need to cordon off various areas inside and outside of facilities.

Cable foils - structure and properties

Fulfilling the role of permanent and proper information and warning material, cable foils must have appropriate parameters and construction. The most common raw material for their production is polyethylene and its modified variants. The thermal resistance of these materials ranges from -20 to +90 degrees Celsius. This is their static long term strength, however, they also work and keep their parameters in situations deviating from the assumed norms. Cable foils are available in various colours and can be printed with information. They are usually sold in rolls of 50 mb length. For industrial applications, 100, 200 and even 500 mb reels are available. The width of particular tapes varies from 20 to 50 centimetres depending on the type and destination. In order for the film to be resistant and fulfil its purpose in earth trenches, they are produced in thicknesses of no less than 0.3 mm to 0.5 mm. This allows it to maintain its structure and resistance to rupture up to 200% of its toughness. Some types have perforations across the surface to allow moisture to pass between soil layers within the trench.

Cable wrapping - purpose and recognition

In marking cables being laid and buried in installation trenches, it is important to use the appropriate color of film for the category of cabling. This allows for proper identification of the type of installation we are dealing with. Depending on the parameters of the power network, we use specific cable foils to mark a particular cable route in the ground:

  • Blue colour - is one of the two basic colours in power engineering. It is a sign that we are dealing with an installation with voltage below 1kV. This information helps you to take further action to repair or warn and protect the site.

  • Red - indicates that there is wiring with voltage above 1kV.

  • Yellow and orange cable foils - usually signify telecommunication lines.

  • Brown warning foil is laid over building and industrial sewage pipes.

For easier identification of underground installations in the future, all kinds of prints are made on tapes and foils. Most often they refer to the type of cabling that is marked with them.

Warning and information foil

Various types of warning tapes, known as health and safety tapes and location tapes, are used in repair work, new construction and individual jobs. They are also commonly used by uniformed safety and rescue services to mark accident sites and various random events. Warning foils are also an element indispensable in road works of renovation teams to isolate and redirect traffic away from places where works take place. They separate dangerous zones from access of unauthorized persons. They can be stretched between any elements of the infrastructure located in the area of work or be attached to portable posts with bases. This allows the safety corridors to be configured in any way and informs those present of the danger in the marked area. The most common colour scheme of stretch warning foils is an alternating combination of yellow and black or white and red transverse stripes.

Self-adhesive warning foil is used to mark paths and routes of pedestrian traffic in many industrial halls, large warehouses and logistics centres. It is usually yellow in colour and may come with fluorescent fragments to improve visibility. The adhesive allows it to be freely and permanently affixed to many types of surfaces. In the hot-glued version, the warning film may be adhered to asphalt road surfaces, concrete roads and other bituminous structures.