The invention relates to a frame (1, 1a, 1b) for a cable penetration system. Said frame, which is used for receiving a plurality of bushes (20, 120, 220), comprises at least one strip (2, 12) that is arranged at a distance from the frame and is lower than the adjacent frame. Connection devices (3, 3′, 3″) suitable for receiving suitable mating pieces (23, 123, 223) for the connection devices are disposed on the strip (2, 12), the mating pieces being disposed on bushes (20, 120, 220). The connection devices (3, 3′, 3″) are arranged in such a way that bushes can be mounted in the frame essentially only in the direction normal to the frame. The invention further relates to a bush (20, 120, 220) for a cable penetration system. Said bush, which is to be received in a frame, comprises a main body, inside which a through-hole (21, 121, 221) is provided from a top side to a bottom side in the normal direction in order to receive a cable. The bush comprises at least one strip (22, 122, 132, 222, 232, 322) which is arranged at a distance from the main body and is lower than the adjacent main body. Connection devices (23, 123, 223) suitable for receiving suitable mating pieces (3, 3′, 3″) for the connection pieces are disposed on the strip, the mating pieces being disposes on a frame. The connection devices (23, 123, 223) are arranged in such a way that the bush can be mounted in the frame essentially only in the direction normal to the frame, at least two connection devices (3, 3′, 3″) being arranged on the strip (2, 12) for each bush that is to be mounted.