Junction Box Electrical Back Box Sizes

Different electrical box sizes fit varying installation needs.

Junction box electrical back box sizes.

It houses a single electrical switch or outlet and comes in metal or nonmetallic units. They are shaped like boxes but have no back. The shape of an electrical box can help you identify its purpose. They are designed to be installed onto the front of standard electrical boxes to increase the box capacity or to bring the box flush with the drywall or other surface material.

Choose from a variety of sizes and shapes box depths that range from 1 2 to 4 deep and accommodations for one to six gangs. Old work electrical box 1 2 3 4 gang. Plus one universal electrical wall box 1 gang 10 cu. Box extenders or extension rings come in a variety of sizes and shapes to match standard electrical boxes.

Grainger carries a junction box selection to help you meet a wide range of different electrical wiring needs. Typical electrical junction boxes. Use 314 28 a to size pull boxes junction boxes and conduit bodies when using conductor sizes 4 awg and larger. The national electrical code article 314 contains complete details and tables of electrical box sizes in dimensions and cubic inches and should be consulted for complete accuracy because the actual size of the box required in cubic inches depends on the number of wires that will be within that enclosure.