The box (1) has four upstream and downstream connectors (4, 4`) mounted on a rear wall (12) of a shell (11). The connectors (4, 4`) respectively define housings (41, 41`) with their central axes (X 41, X` 41) inclined with respect to an inner side (121a) of a main web (121) of the wall. The axes are moved from the side by moving connectors in the direction of inlet zones (17, 18) of conductors connected to the connectors.
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