A frame section for a switching cabinet rack having at least one inner wall which faces the inside area of the switching cabinet and is fitted with a row of regularly spaced fastening cavities. The fastening cavities do not reduce rigidity to any significant degree. At the same time fixtures can be mounted on the fastening cavities in a stable manner by designing the fastening cavities as slotted openings with clear openings larger in the longitudinal direction of the frame section than the width of the clear openings perpendicular to the longitudinal direction.