Junction Box vs. Outlet Box: Understanding the Basics
When it comes to electrical work, there are a lot of technical terms that can be hard to understand. Two of the most common terms you're likely to hear are junction box and outlet box. While these might sound similar, they actually serve very different functions. In this article, we'll be breaking down the key differences between these two types of boxes.
What is a Junction Box?
A junction box is a component that connects two or more electrical wires together. Essentially, it acts as a housing unit for the wires to be joined in, preventing any exposed sections of wire that can be a potential hazard. Junction boxes are important for safety reasons, as they protect the circuit from overloading by containing the connections in one safe place.
What is an Outlet Box?
An outlet box, on the other hand, is a component that provides a housing for electrical outlets to be installed in. These boxes come in a variety of sizes and shapes and are made to fit different types of outlets. Outlet boxes are installed in walls or ceilings, providing a secure and safe place for wiring and outlets.
Differences in Shape and Size
One of the most obvious differences between junction boxes and outlet boxes is the shape and size of each. Junction boxes are typically square or rectangle-shaped and come in a variety of sizes depending on the number of wires being housed. Outlet boxes, in contrast, are usually rectangular but can also be circular or hexagonal-shaped and are a bit larger than most junction boxes, as they need enough space to fit an outlet.
Uses
Another key difference between these two boxes is the uses they serve in electrical work. Junction boxes are used whenever there is a need to connect multiple wires together, whereas outlet boxes are used whenever there is a need to install electrical outlets.
Location of Installation
Junction boxes are typically installed in an attic, crawl space or similar locations as they do not require being at service level. Outlet boxes, since they have an outlet, need to be installed at service level which is commonly at or near floor, desk or countertop level.
Protection
In terms of protection, junction boxes are designed for safety and to contain any sparks or fires that might occur due to electrical mishaps. Outlet boxes, however, are designed primarily for convenience and ease of access, making it easy to plug in electronic devices without having to worry about exposed wiring.
Wiring
Junction boxes will often have many wires coming in and out as it is designed to act as a junction for multiple connections. While an outlet box is designed for one or two wires out to an electrical outlet from the main circuit.
Covering
Junction boxes usually have detachable covers of various materials, made to cover the wires and protect them. Outlet boxes also have covers that are flush with the wall or ceiling surface, making it easy to cover the outlet when not in use, for a clean look.
Costs
The cost of these boxes can vary significantly based on factors such as size, material, and brand. However, generally, junction boxes are often cheaper than outlet boxes, as the latter includes an electrical outlet.
Installation
While it is always best to consult a professional electrician when it comes to electrical work, both types of boxes are relatively easy to install. Junction boxes are typically mounted and screwed into place. Outlet boxes are installed by inserting them into a wall or ceiling opening and secured in place with screws.
Conclusion
In summary, junction boxes and outlet boxes serve very different purposes in electrical work. Junction boxes connect wires together while outlet boxes contain an electrical outlet. It's important to understand the differences between these two boxes so you can use the appropriate one for your electrical needs.
