A 5 x 2.5 mm² charging cable for 11 kW has a line diameter of 13.6 mm; the smallest bending radius is 6x the cited diameter ‒ this would be 8.15 cm. Thus, a coil has a diameter of 2x the radius. 16.3 cm is the smallest possible coil that can be wound.
A 5 x 6 mm² charging cable for 22 kW has a line diameter of 17.4 mm, the smallest bending radius is 6x the cited diameter ‒ this would be 10.44 cm. Thus, a coil has a diameter of 2x the radius. 21 cm is the smallest possible coil that can be wound.