A system for electrically connecting first and second load wires and first and second source wires. The system includes a lock body defining a receptacle inside the lock body. The system also includes first and second contact elements for electrically connecting the load wires and the source wires. The load wires are connectable to the first and second contact elements at first and second load ends thereof. The system includes one or more slider bodies slidably received in the receptacle, and the contact elements are partially mounted in the slider bodies. The system includes one or more pinch levers mounted to the lock body and movable from an inactive position to a locked position. When the pinch lever is moved to its locked position, the slider body is moved in the receptacle relative to the lock body, and the contact elements engage the source wires for electrical connection therewith.