This application allows you to calculate the section of a LV copper cable on a perforated shelf (marine slab) or welded mesh (cablofil), on a single layer according to the criterion of admissible intensity in accordance with the UTE C15-105 guide and calculate the section of an HV cable made up of 3 single-core aluminum cables in a closed visible trunking or a covered cable tray or embedded in non-visible floors, on a single layer according to the criterion of admissible current in accordance with the standard NF C13-200.