The Ceiling Mounted Cable Tray And Board Fixing Drawing includes mounting arrangement of cable tray suspended from ceiling slab / purlings and h.d galvanised cable tray mounted on roof finishes and distribution board fixing detail that shows 41x21mm unistrut chanel (complete with spring nuts/bolts) and armoured cable fixed on cable tray by cable cleats. spacing of cables should be in accordance with the specification with plinth for cable tray. (200mm high from roof finishes). download free electrical board distribution DWG file.