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These are all several types of electrical boxes (except the lunch box, needless to say). The location and type of wiring you’re doing will determine which type of box to utilize. The lunch box is going to be used after the job is performed. Before we get into specific kinds of boxes, let’s review some things that are applicable to all sorts of electrical boxes.

*All electrical connections must be contained inside Mould Box. The box shields the property material as well as other flammable materials in the event of electrical sparks.

*All boxes must be accessible. Never cover a box with drywall, paneling or some other wall coverings.

*If the electrical junction box holds only spliced wires and no device, for instance a switch, it should be covered with a blank cover plate.

*An electrical box should be installed with all the front edge flush with the finished surface of the wall or ceiling. When the space in between the finished surface and also the edge of the box is more than 1/8″, then this box extender ought to be installed.

*Make certain your box is deep enough in order to avoid crowding the wires. It should 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 the things size each scale of box can accommodate based on the cubic-inch capacity in the box. For instance, a #14 wire occupies 2 cubic inches as well as 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 big box until you don’t have room in the wall or ceiling.

Electrical boxes come in different materials and different shapes. By familiarizing yourself using the different types of boxes, you’ll have the ability to pick the correct box for your house wiring project.


Indoor boxes are usually either plastic or metal.


*Plastic electrical boxes are definitely the most widely used boxes for indoor residential wiring. They’re inexpensive and simple to set up. However, since you cannot ground a plastic box, so some local codes do not let them or they are only allowed for certain uses. Check with your local building department before using Safety Protecting Case.

*Some plastic boxes have holes w/knockout tabs. These boxes do not have built in clamps and so the cable is not really held in place through the box. You have to use cable clamps and staple the cable within 8 inches of the box if you are using this kind of box.

*Plastic boxes are easier to damage than metal boxes, so buy extra boxes just in case. Never put in a cracked box.

*Most are brittle; don’t utilize them where they are certainly not included in the wall. The exception is an outdoor box made of extra strong PVC.

*Don’t use with heavy light fixtures and fans. Some plastic boxes include nails for anchoring the box for the framing material.


*Metal electrical boxes are stronger and supply better ground connection than plastic boxes.

*Metal boxes has to be grounded to the circuit grounding system. Connect the circuit grounding wires for the box having a pigtailed green wire and wire nut, or having a grounding clip.

*The cable entering a metal box must be clamped.

*”Gangable” boxes can be dismantled and ganged together to help make space for two or more devices.


*They are sometimes called old-work or cut-in boxes.

*Remodel electrical boxes are employed when running cable to set up new devices into an old wall.

*Plastic remodel boxes have “wings” and metal remodel boxes have expandable clips or bendable ears that hold them inside the wall.

Outdoor boxes are generally molded plastic or cast aluminum.

Molded Plastic:

*These boxes are utilized with PVC conduit in outdoor wiring and exposed indoor wiring.

Cast Aluminum:

*These are generally required for outdoor fixtures linked to metal conduit.

*They have sealed seams and threaded openings to maintain moisture out.


Rectangular (2″X3″) Trade Name “One-Gang”:

*These boxes are used for switches and receptacles.

*One-gang boxes may have detachable sides that permit them to be ganged together to make two-gang boxes.

Square (4″X4″) Trade Name “Four-Square”:

*”Plaster Rings” are employed as adapters to accommodate the following configurations: One-Gang, Two-Gang, Three-Inch or Four-Inch Round.

*When a square box is used simply for splicing cables, it really is called an electrical junction box and a blank cover plate should be used.

Octagonal Trade Name “Three-“:

*These contain wire connections for ceiling fixtures.

*Some octagonal electrical boxes have extendable braces that will fit any joist spacing and they are nailed or screwed towards the framing material.

While choosing the OBD Shell to your project will help to make sure the successful completing your wiring project, always respect electricity and follow safety precautions. Never work on live circuits. Before tipyyy begins, the circuit should be identified and turned off on the panel, tagging it to let others know that work will be done on that circuit. Confirm the power is off with a voltage tester. Electrical work should just be done by a good, experienced person or by way of a licensed electrical contractor.

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