Electrical installation box, especially in-wall box, has male and female connection ports dimensioned so male port of box can be inserted into female port of another box with surfaces engaged

摘要

The box (1) has at least two protruding, essentially tunnel-shaped male and female connection ports (2,3) dimensioned so that a male port (3) of the box be inserted into the female port of another box with the transition region (9) between the tunnel wall and the tunnel floor (4) engaging tunnel slots and the inner surface of the tunnel floor of the male port engaging under that of the female port.