A well-chosen and dimensioned cable bedding can significantly improve heat dissipation from the cable surface and thus extend its lifespan, just as a poor bedding can lead to its overheating and premature destruction. Therefore, it is necessary to investigate the thermal properties of the route material and the bedding material before its application. In highly urbanized areas, due to limited spatial resources and/or the need to cross with other infrastructure, power cables are often laid in concrete bedding. In this case, it is also necessary to measure the thermal properties of the concrete.