A terminal board for the electrical interconnection of electrical conductors (K), comprising a body (2) of electrically insulating material inside which tubular electrical connectors (3) are housed, electrically insulated from one another and configured so as to define open tubular elements and equipped with clamping screws (4). Advantageously, the body (2) is divided into two articulated portions (9,10) articulated together through hinged connection means (6) to allow such a body (2) to pass from an extended configuration to an overlapped configuration in which said articulated portions (9,10) are substantially side-by-side extending on from one another and, respectively, are brought together overlapped one another.