The following is a list of the most common electrical boxes:
- Rectangular for switches and receptacles
- Square for junctions or two receptacles/ switches
- Octagonal and round for ceiling fixtures
- Retrofit types for inserting into existing walls and ceilings
- Aluminum and PVC plastic for exterior use
- Boxes with extendible bars or braces for attaching between joist
- Pancake boxes for limited circumstances when a regular box is too deep for the wall or ceiling space (Most of the plastic ones are not listed as tested by UL, and the metal ones are rated for only one cable, usually 14 gauge.)
- Fan-rated boxes—the only boxes you can use to install paddle fans
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