Cables are designed for fixed installation in ordinary or possibly damp environments in the air. 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. 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.