Junction Box, Switch Box, Two-Gang Box Or Lunch Box: Which Box Do I Use?
These are all different types of electrical boxes (except the lunch box, of course). The location and type of wiring you’re doing will determine which type of box to use. The lunch box will be used after the job is done.
Before we get into specific types of boxes, let’s go over some things that are applicable to all types of electrical boxes.
- All electrical connections must be contained inside an electrical box. The box shields the building material and other flammable materials in the event of electrical sparks.
- All boxes must be accessible. Never cover a box with drywall, paneling or other wall coverings.
- If an electrical junction box holds only spliced wires and no device, such as a switch, it should be covered with a blank cover plate.
- An electrical box should be installed with the front edge flush with the finished surface of the wall or ceiling. If the space between the finished surface and the edge of the box is greater than 1/8?, then a box extender should be installed.
- Make sure your box is deep enough to avoid crowding the wires. It must be deep enough so a switch or receptacle can be installed easily without crimping or damaging the wires. Electrical codes determine how many wires of what size each size of box can accommodate based on the cubic-inch capacity of the box. For example, a #14 wire occupies 2 cubic inches and a #12 wire occupies 2.25 cubic inches. When counting wires, count the fixture or device as one wire. It’s always safe to use a large box unless you don’t have room in the wall or ceiling. There is a chart on the , experienced person or by a licensed electrical contractor.
About the author
Dave Rongey is a Licensed Electrical Contractor with over 35 years of experience. He is also an avid Do It Yourselfer.More information on electrical boxes can be found in the Electrical Boxes section of his website: Ask-The-Electrician.com.
Tags: 35 years, building material, cubic inch capacity, cubic inches, drywall, electrical boxes, electrical connections, electrician, finished surface, flammable materials, job, licensed electrical contractor, lunch box, paneling, receptacle, shields, sparks, wall coverings
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