For the purposes of the calculation, a permanent drop of 1.5% for 230V and 2% for 400V was assumed for three phases and the operating temperature of the cable in the range from -25 ° C to +60 ° C.
Popular vein cross -sections are: 1 mm², 1.5 mm², 2.5 mm², 4 mm², 6 mm², 10 mm², 16 mm², 25 mm².