Disclosed herein are embodiments of a wiring box. The wiring box can include: a cavity formed by walls having an internal surface inside the cavity and an external surface; and a cable entry device disposed through a hole in a first wall of the walls. The cable entry device can include: a support element that retains a grommet in the hole, wherein the support element includes a stop, a grip extending from the stop, and shutters extending from the stop and defining an opening, wherein the opening converges away from the stop, the grip attaches the support element to the first wall, and wherein the grommet includes a rim, a sidewall extending from the rim and converging toward a diaphragm.