These connectors are far superior to the traditional domestic wire nuts. They allow easy addition or removal of Romex power lines from a junction box power system. I have made a habit of using the center of the three connectors as the 'feed' connection bringing power into the junction box and then the outer two connections serve as a means to distribute power out to various loads. With this consistent connection method, I can easily remove a 'load' wiring connection without constantly going back to the circuit breaker panel to shut off that circuit breaker branch. Another benefit is that each Romex wire is held and connected independently unlike wire nuts which can easily have one or more wires slip out during assembly. I will be using these in a speaker installation of a sound system for a church that is coming up soon. A great improvement of the old school method of wire nuts!