Abstract: A preset access housing for use with metal cellular flooring units of the type placed in building floors, and which provide generally parallel enclosed cells separated by troughs. The housing spans between the confronting webs of two of the cells and has side walls depending into the region between the cells to enclose a trough space. A connection formed in part from portions of the end walls of the housing and in part by slots in the generally vertically webs of the cells, connects the housing to the flooring unit. Deflectible means associated with the side walls of the housing, engage a surface of the flooring unit in the region between the cells, are deflected, and urge the housing upwardly relative to the flooring unit thereby to retain the connection between the housing and the flooring unit.

Abstract: An insert for an underfloor electrical wiring distribution system of the type incorporating a distribution unit presenting alternating cells and troughs and capping means enclosing one of the troughs to provide an intermediate cell having at least one trough portion accessible from the upper surface of the floor. The insert includes an isolator device having a generally U-shaped configuration including spaced sidewalls and a connecting front wall. The isolator device is installed in the trough portion to provide an isolated chamber. Connecting means in the form of cooperating tabs and apertures positively secures the device to the distribution unit. A partition plate may be installed with a lower portion thereof retained by the device and with an upper portion thereof extending above the isolator device.