Fire-resistant electrical wiring distributing floor structure and method

摘要: A floor structure comprising a metal subfloor including cellular units providing plural enclosed cells; housings associated with certain of the cells, each adapted to provide future access different electrical services at one location in structure; covering layer monolithic concrete and housing, fireproofing material lower face subfloor. Activating means is provided establishing cells through housing without significantly reducing desired fire endurance increasing thickness material. The has which less than that required when activated. method disclosed for acess insert while maintaining capability structure.