Electrical boxes encase wire connections to prevent short circuits. Almost all devices connected to your home’s wiring use one — from receptacles and switches to ceiling fans, outside lights and more. But the kind of junction box you need depends on how you’re using it. For example, commercial applications need impact-resistant build and often a UL 94 flame rating. These boxes may also require a higher number of connections and more space than you’d find in residential boxes.
If you’re replacing a light fixture with a ceiling fan in existing drywall, the type of old-work box you need to install depends on how it’s mounted. If it’s positioned directly over a joist, you can use a pan box that gets screwed to the joist from underneath, or a saddle box with extended sides that fit around the faces of the joist for more room. If the box is positioned between joists, you’ll need a bracing bar like a new-work box would. But if you can’t access your attic, you can use a retrofit bracing bar that extends through the hole in the ceiling and clamps to the top of each side of the box.
You can mount most types of junction boxes at lighting outlets in the ceiling or wall. But when installing a ceiling fan, you must choose a box that is specially rated for fan mounting and labeled to that effect. It must also support a weight of at least 50 pounds.
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