The present disclosure relates to a cable sealing device (30) for providing a seal about a cable (88, 90). The cable sealing device (30) includes a cable seal arrangement (38) that is pressurized to seal the cable (88, 90). The cable sealing device (30) includes an autonomous containment structure (92F, 92R, 56) for laterally and axially containing the sealing arrangement (38). The autonomous containment structure (92F, 92R, 56) includes a moveable portion (92F, 92R) that is moved to an actuated position to pressurize the cable seal arrangement (38). The cable sealing device (30) also includes a retention mechanism (129) for retaining the moveable portion (92F, 92R) in the actuated position. The autonomous containment structure (92F, 92R, 56) further includes an autonomous perimeter casing (56) mounted over the sealing arrangement (38) for laterally containing the cable sealing arrangement (38) such that the cable sealing arrangement (38) remains pressurized when the moveable portion (92F, 92R) is in the actuated position independent of whether the cable sealing device (30) is mounted within an enclosure (20). The cable sealing device (30) has a wrap-around configuration for allowing a cable (88, 90) to be laterally inserted into the cable sealing device (30).