Aluminium Alloy Junction Box – What To Look For..

These are all different types of electrical boxes (except the lunch box, obviously). The location and kind of wiring you are doing will determine which kind of box to use. The lunch box will likely be used after the job is performed. Before we get into specific varieties of boxes, let’s go over some things that are applicable to all kinds of electrical boxes.

*All electrical connections must be contained inside Plastic Waterproof Box. The box shields your building material and other flammable materials in case of electrical sparks.

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

*If an electrical junction box holds only spliced wires without any device, like a switch, it ought to be covered with a blank cover plate.

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

*Make sure your box is deep enough to prevent 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 the items 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 and a #12 wire occupies 2.25 cubic inches. When counting wires, count the fixture or device as you wire. It’s always safe to use a big box until you don’t have room within the wall or ceiling.

Electrical boxes come in different materials and other shapes. By familiarizing yourself using the several types of boxes, you’ll be able to choose the correct box for your house wiring project.


Indoor boxes are generally either plastic or metal.


*Plastic electrical boxes are the most widely used boxes for indoor residential wiring. They’re inexpensive and simple to set up. However, because 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 Mould Box.

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

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

*Most are brittle; don’t make use of 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 to the framing material.


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

*Metal boxes should be grounded for the circuit grounding system. Connect the circuit grounding wires for the box using a pigtailed green wire and wire nut, or with a grounding clip.

*The cable entering a metal box must be clamped.

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


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

*Remodel electrical boxes are employed when running cable to put in new devices into an older wall.

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

Outdoor boxes are often 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 necessary for outdoor fixtures linked to metal conduit.

*They have got sealed seams and threaded openings to help keep moisture out.


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

*These boxes can be used as switches and receptacles.

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

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

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

*Each time a square box is utilized just for splicing cables, it 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 are nailed or screwed for the framing material.

While choosing the OBD Shell for your project will assist you 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 ought to be identified and switched off on the panel, tagging it to let others know that work is being done on that circuit. Confirm the power is off with a voltage tester. Electrical work should simply be done by a confident, experienced person or by way of a licensed electrical contractor.

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