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Different Electrical Box Sizes and Shapes help your right choice

The shape of an electrical box can help you identify its purpose. Different electrical box sizes fit varying installation needs.A standard rectangular shape is the most common electrical box. It houses a single electrical switch or outlet and comes in metal or nonmetallic units. These boxes protect wiring from the elements with gaskets, sealed seams and watertight covers.A square electrical box, also known as a “double-gang box,” houses two devices. They'll have a combination outlet/switch or a pair of outlets/switches inside.The round or octagonal box houses lightweight fixtures or safety devices in the ceiling. These are used for lights or smoke and carbon monoxide alarms.A ceiling box is for heavier fixtures, such as ceiling fans or chandeliers. Be sure to choose a ceiling box that is made to support extra weight.