Cables are designed for fixed installation in ordinary or possibly damp environments according to ČSN 33 2000-3. Value of water pH in short-term shallow immersion is 3-11. They are suitable, in particular, for use on an inflammable surface and in environments with fire hazards where maintenance of circuit integrity during a fire is required. If it is necessary to lay the cable in the ground, it has to be provided with a protection tube, and has to be laid in bed of sand according to ČSN 33 2000-5-52. The cables could not be exposed to long-term direct sun radiation. They are suitable for places with high concentration of people such as underground, airports, and hospitals, or for protection of high-tech equipment in buildings in case of fire.Installation of the product should only be carried out by personnel trained and qualified for electrical works. The product is designed according to recognized standards. Applicable rules of installation must be applied at all times.