Abstract: A transmission wire connector, and a kit of parts for assembling such a transmission wire connector, is provided. The transmission wire connector, and a kit of parts, includes a first wire contact member and a second wire contact member mounted in bores in a base unit wherein the first and second contact members contact an exchange linked wire and a consumer linked wire respectively. The first and second wire contacts within the base unit are isolated from one another. A separable module unit cable of coupling with the base unit and providing direct or indirect electrical connection between the first and second contacts when the module unit is coupled to the base unit is also provided. The separable module unit is one of a plurality of such module units arranged to provide different functions to the connector or wire it connects. The connector may also include actuators for forcing the contacts and wires into an insulation displacement relationship.