Abstract: The invention relates to a modular assembly for the construction of an exhibition stand comprising at least one panel fixed to at least one post resting by their bases on an installation area, wherein the base of the panel rests on the installation area by means of at least one hollow profiled member whose base is fixed to the panel and can receive at least one pipe carrying a fluid, as well as electrical signal conductors, whereby at least the base of the post is hollow facing the base hollowed profile member of the panel to permit connection to pipes or other panels or the connection of said pipes to other pipes, as well as the connection between conductors of other panels or the connection of these conductors to other conductors.