Back-to-back type shuttered box for housing e.g. switch installed in concrete formwork in building wall, has male and female boxes, where distance between boxes is adjusted to lock boxes with respect to one another without using insert

摘要

The shuttered box has a male box (1) and a female box (2) arranged together to form a box body comprising a cylindrical part and a rectangular part. The box body includes knockout caps and a bottom part at its rear side. The male box comprises a perforated cylindrical portion that is compatible with a perforated cylindrical counter portion of the female box, where a distance between the male and female boxes is adjusted to lock the male and female boxes with respect to one another without using an insert.