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A non-rigid mechanical coupling for coupling a head assembly of a feed-through fitting to a slotted wiring conduit inserted in an opening formed in the floor of a building, wherein an apertured conduit flange is provided with plural tabs extending radially inwardly into plural slots formed in a comm

A non-rigid mechanical coupling for coupling a head assembly of a feed-through fitting to a slotted wiring conduit inserted in an opening formed in the floor of a building, wherein an apertured conduit flange is provided with plural tabs extending radially inwardly into plural slots formed in a common transverse plane in the conduit such that the conduit flange tabs are loosely retained in the conduit slots to provide a non-rigid mechanical connection therebetween. Assembly of the connection is achieved by forming the slots in the conduit, deforming radially inwardly each axial portion of the conduit between each slot and the end of the conduit, orienting the conduit flange at the end of the conduit in alignment with the deformed portions of the conduit, sliding the conduit flange onto the conduit until the tabs are seated against the undeformed edge of the slots, and reforming the deformed conduit portions to their original cross-section, whereby the tabs are radially and axially confined by the respective slots.

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In a fire-rated feed-through fitting for transferring insulated wires through a conduit disposed in a circular opening formed in a floor of a building by which electrical power and other signals are transmitted from a source located at one face of said floor via said wires, through said fitting moun

In a fire-rated feed-through fitting for transferring insulated wires through a conduit disposed in a circular opening formed in a floor of a building by which electrical power and other signals are transmitted from a source located at one face of said floor via said wires, through said fitting mounted in said opening to respective circuits connected to said wires and mounted on a head assembly disposed on the opposite face of said floor, an improved non-rigid joint for loosely mechanically coupling said head assembly to said conduit, comprising: at least one conduit flange having a peripheral portion coupled to said head assembly, said peripheral portion circumscribing an aperture having an outline shaped in correspondence to the cross-sectional dimensions of said conduit, but larger than the conduit, and plural tabs integrally formed with said peripheral portion and extending radially inwardly into said aperture at approximately common intervals around the circumference of said aperture; and said conduit having a plurality of slots formed in the vicinity of one end of the conduit, said slots spaced substantially in a common transverse plane at intervals corresponding to the spacing intervals of said conduit flange tabs; and wherein said tabs extend into said conduit slots and are loosely retained therein, holding said conduit and head in assembled relationship via said conduit flange, with the peripheral portion of the flange held spaced from the conduit by limited spaced contact between the tabs and slots, thus significantly reducing thermal conductivity between the conduit, flange and head assembly.