An electrical switchgear cabinet for an electrical service distribution panel includes a rear wall having four corners and four side edges and a peripheral L-shaped first bent edge disposed on each of the four side edges; a first side wall with at least two bent edges; a base wall with at least two bent edges; and a first attachment part disposed at a first corner of the rear wall and insertable behind the first bent edges of two of the four side edges, wherein the first attachment part has two longitudinally running slots, a first slot receiving one of the at least two first side wall bent edges and a second slot receiving one of the at least two base wall bent edges.