US 4,899,506 AGranted

Large capacity electrical service fitting for concrete floors

AssigneeSquare D Company

InventorsDonald L. Chapman, Robert L. Kimbrough

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Abstract

A floor construction includes a concrete floor having a main duct embedded in the concrete floor. The main duct has a bottom and a top, with the top being covered by the concrete floor. A service fitting includes a service box and an auxiliary duct means. The service box is located adjacent a side of the main duct and has a plan area and a capacity substantially equal to at least that plan area times a depth of the concrete floor above the bottom of the main duct. The auxiliary duct lays transversely across the top of the main duct and is attached thereto for providing a passage for wiring from the main duct to the service box. The main duct preferably is a multi-cell duct, and the auxiliary duct includes dividers dividing the auxiliary duct into passageways corresponding to the cells of the main duct. This construction provides for a greatly increased capacity for the service fitting in concrete floors of minimum depths.

Claims24

Dependent claims

A floor construction having an electrical duct system, comprising:

a base floor;
a main duct located above said base floor, said main duct having a top, a bottom and first and second transverse sides, said top being located at a first elevation above said base floor, said main duct having a plurality of cells and having an access means defined through said top of said main duct for providing access to each of said cells;
a service fitting including:
a service box located adjacent one of said transverse sides of said main duct, said service box having a box top located at a second elevation above said base floor, said second elevation being substantially higher than said first elevation;
and
an auxiliary duct engaging and extending transversely across said top of said main duct, said auxiliary duct having a bottom with a wiring opening defined therein communicated with said access means, said auxiliary duct having a closed first end and an open second end, said second end being communicated with said service box so that wiring can extend from said main duct through said auxiliary duct into said service box;
and
a concrete floor poured over said main duct, said concrete floor having a depth extending from said base floor up to approximately said second elevation of said box top of said service box.

5 more elements

Dependencies are inferred from the claim text.