A cable anchor assembly for facilitating ready anchored connection of cables to components while protecting the cables from external forces and from moisture. The assembly includes a plurality of plates slidably engageable along a rail for facilitating relative movement between the plates. Each plate has an engaging edge that defines a portion of a formable collar in which a cable is receivable. A fixture, such as a rubber boot, is placed over a section of the cable and, with the plates separated, the cable section is placed between the formable collar portions, whereupon the plates are brought into sliding edge-to-edge contact with each other to enclose the cable section and boot. With the plates in contact, a securing mechanism is operated to maintain contact between the plates. In a preferred embodiment, the boot is configured to create a substantially water-resistant seal between the cable section and the movable plates.