PLURAL-CELL DUCT

A plural-cell duct, embedded within a concrete floor, has openings spaced apart along the length thereof; and collars extend upwardly from those openings to help define potential passages extending from the cells of that duct to the surface of that floor. Each of those potential passages has a barrier therein which will effectively isolate one of the cells of that plural-cell duct from an adjacent cell. Whenever a support for an electrical fitting is to be secured to any of those collars, the barrier can be removed from the potential passage through that collar to free substantially the entire cross section of that passage of any -- thereby facilitating the "fishing" of conductors through the plural-cell duct and that collar. Subsequently, a support for an electrical fitting will be secured to the collar; and that support will have a divider which will coact with a partition in the plural-cell duct to restore the isolation of the one cell from the adjacent cell.