[Ziaholic]

In my experience, the trick with these connections is to prevent ANY movement of the cable, a few inches away from that clamped-end area.

We tied our cables down to the electrical panel to eliminate any sort of vibrations or cable movement from making that connection wiggle loose. Before we did that, it would wiggle loose EVERY time.

... and not only for this interface, but for every wire that goes to/from our terminal block assembly also ... same principle ... if the wires can move, they WILL wiggle out of those clamp-type connections.