Device installation box 1-way data technology for BR C-profile for switch ranges. Device installation box for parapet duct with C-profile device installation, modularly stackable, increased installation depth for flush fitting with the upper part of the parapet duct, vertical and horizontal device installation possible. Device holding screws in quick-thread design. Tool-free mechanical locking in the parapet duct, with fold-down bar for easier connection of multiple data sockets. For holding communication connection boxes with support rings or support bars and 60 mm fastening track. For use with frames of commercially available installation switch programs.