Abstract: A set of elements fitting in unit-composed systems for office and house furniture comprises a vertical supporting rod having at the bottom and at the top a plurality of slots for the interchangeable radial connection, respectively with a base and with a bar for mounting panels, containers, shelves, etc, by means of a properly shaped plate.The bar comprises at least two elements and preferably a central one connected to end joints, provided with inner passages for housing electric and/or telephone wires therein. For example these passages are formed by a H beam associated with two opposite outer channels. For the passage of said wires from the vertical rod to the bar, a connecting box may be provided.