The three phases are combined with the ground: however, the ground conductor is divided into three conductors placed in the star points of the three power conductors. Additionally, a shield is placed on the phases and ground as in solution 2. This construction solution improves upon solution 2 as it combines high shielding effectiveness with a significant reduction in the total electromagnetic flux. This is achieved through the symmetrical arrangement of the power conductors and the almost complete compensation of induced disturbances on the grounds, thanks to the symmetrical arrangement of the ground conductors.