Switchboard for electrical installations in which a three-phase at the entrance system is distributed to single-phase three-phase conductors and pipes, comprising a preconnected bus system (5R, 5S, 5T) which distributes the three phases at the entrance (R , S, T) in rows (RO) and columns (CO) lines of connection points (16) so that the phases (R, S and T) are alternated in a cyclic sequence both along the rows (RO) and columns (CO) of the connection points (16). A switchboard possessing such a bus system allows a reduced size construction, and allows the electrician during installation not to worry about the location of pipelines on the individual phases, given that these phases ( R, S and T) are always arranged in the correct sequence in horizontal and vertical directions.
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