A rapid mount electrical cable entry device including a rigid low voltage frame and a flexible slotted insert for routing low voltage cables through walls. The low voltage frame includes a plate with an opening therein defining an inner periphery on the plate at the opening. The low voltage frame includes mounting fasteners with attached clamp arms for securing the frame to a wall. The slotted insert includes a flexible panel with a hole therein and a plurality of open slots extending radially from the hole. The slots enable the cable entry device to accommodate passage of low voltage cables there. The slots define flaps that close around the cables after they are inserted therein, thus closing the area around the periphery of the inserted cables. Wall preparation requires only a hole saw, which minimizes installation time.