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Octagonal Boxes

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Octagonal metallic electrical boxes serve the same ceiling outlet and junction role as round boxes, with a larger footprint that provides more interior volume and additional knockout positions for conduit routing. The 4-inch octagonal box is the most common format and a standard ceiling box in many commercial and residential specifications.

The greater interior volume of a 4-inch octagonal box compared to a standard round box makes it better suited for installations with multiple conductors or where additional junction capacity is needed at the ceiling. Standard and deep configurations are available to meet NEC fill requirements for different conductor counts and wire gauges.

Octagonal boxes are compatible with most standard round and octagonal ceiling covers, including blank covers for junction points and fixture mounting brackets for surface-mounted luminaires. Multiple pre-punched or pry-out knockouts allow flexible conduit entry on any face of the box.

For fan-rated ceiling applications, see Ceiling Fan Support Boxes. Browse related metallic box formats in Round Boxes and Square Boxes, or view the full Metallic Boxes and Accessories catalog.