an electrical connection housing , especially for undercarpet cable systems , including a fixed member which is to be secured to a flat surface and which has an outer side face for receiving a module member . the module member has an inner face which conforms to the outer side face of the fixed member and engagement extensions which extend under the outer side face of the fixed member for retention between the fixed member and the flat surface . recesses are provided in the bottom of a shroud to receive t - shaped extensions . the module member may include telephone outlets , data outlets or power spurs .