kg4wsv:
If you aren't handling much current (e.g. this is data, or low power) the ferrules are OK. The screw terminals will clamp down on a bundle of stranded wire and make a good solid connection, in sort of the same way that a crimp connector clamps down on stranded wire.
-j
In building Industrial control panels we used ferules on EVERY wire in the cabinet. With the combination of the crimp on ferule and the screw terminal there was never any problem with making a good connection. Larger wires still needed to be retightened, but that is standard practice with copper wire, as it needs a retorque after installation. Failure to retorque connections on copper is the biggest reason for terminal failure in high current applications.