Clamp for electrical connections comprising a metal body (1) in which more seats are provided for the electrical connection with a cable or carrier wire (2) and for the electrical connection of one or more cables or derivation wires (3) and means for locking said cables or carrier wires (2, 3) to said metal body (1). The metal body (1) exhibits a channel (10) which is open laterally thus forming a mouth where a bare portion (2N) of the carrier wire (2), which can pass through the same open channel (10) without being interrupted. The channel (10) has a circle arc cross section, with an angular extension greater than 180°, and the ends of said circle arc are joined to two rectilinear edges (11) which frontally delimit the channel (10).