A bracket is mechanically fastened on the bottom of an octagonal junction box or a rectangular electrical box such as those used for installing outlets or switches. Onto that bracket is snapped a cube module which itself consists of at least two square modules but generally three or more square modules. Each module connects to the next in a specific sequence and orientation so that a plug-in member can be inserted through the various holes present in the modules. The holes co-operate with prongs extending integrally from the plug-in member wherein each prong has a specific position and length so that the conductive part of the prong connects with a specific place on a specific module. With the prongs connecting at specific locations into the various squares, the proper set of matching wires are electrically connected.