Electric back boxes, a simple component that often goes unnoticed in the electrical system, plays a pivotal role in ensuring the safety and efficiency of your electrical circuit. Without this important component, you are at risk of exposed wirings, unstable mounting of switches and sockets, violation of building codes, short circuits, and even fires.
But what exactly is an electrical back box? What are its types and the importance of each type? Moreover, how do you choose the right one? This blog will cover all this for you and more.
- What are electrical back boxes?
- Types of electrical back boxes
- Key uses of electrical back boxes
- Choosing the right electrical box
- Step-by-step Installation process
What Are Electrical Back Boxes?
Electrical back boxes are small metal or plastic containers that house electric wires. They can be installed on a variety of surfaces. For instance, walls, ceilings, or other surfaces where electrical fixtures can be mounted. Alternatively known as electrical enclosures or junction boxes, they neatly organize and protect your wires from moisture, dirt, dust, and fast winds.
Types of Electrical Back Boxes
As mentioned before, electrical back boxes come in various types. Each is designed for a specific purpose. Here is a brief overview of the types.
Galvanized Steel Box
These boxes are typically installed in solid walls of masonry construction and feature several removable circular discs that allow cables to pass. They are made of metal and come in a variety of depths. For instance, 16mm, 25mm, 32mm and 47mm in depth.
The shallow ones are typically used in settings where little depth is needed. For instance, lighting circuits for light switches where thin cables are used. In contrast, the deeper ones are suitable for thicker cables and deep electrical accessories. For example, electric shower isolators. Since it is made of metal, these boxes require earthing to prevent it from becoming live under faulty electric currents.
Surface Mount Box
These boxes are designed for walls and ceilings. They are typically made from PVC or plastic, making them lightweight, versatile, and popular for residential use or areas with dry environments.
Unlike galvanized boxes, these do not have an adjustable lug. Therefore, they need to be placed as close to the level as possible. It is important to note that the plastic and pvc surface mount boxes differ slightly in the way they are used.
Plastic back boxes are the cheapest alternative, suitable for areas where the cables are installed in trunking or clipped with little to no risk of mechanical damage. Although they have several knockouts for cables to enter through, these back boxes are quite brittle and may break if you do not remove the cable entry points gently.
In comparison to plastic boxes, PVC back boxes are more resilient and can be easily drilled to cut without the risk of shattering. Moreover, they may have predesigned knockouts for cable entry depending on the requirement of the design.
Dry Lining Back Boxes
Designed specifically for hollow walls, such as drywall or plasterboard, dry-lining back boxes have wings or clamps to hold them securely in place. They are ideal for modern-day homes with drywall construction and can be easily installed without a need for screws.
Weatherproof Back Boxes
These boxes are specially designed for outdoor use since they are suitable for damp environments. However, they must have a secure seal to avoid water ingress.
Flush Mounted Back Box
These are sleek and modern in design, suitable for new constructions. They are typically installed within the walls, resulting in a cleaner, aesthetically pleasing appearance.
Key Uses of Electrical Back Boxes
Now that you know the types, let’s learn about the key uses of electrical back boxes. They are listed below for you:
- Ensuring electrical safety. These boxes protect wiring connections, reducing the risk of electrical short circuits and fires.
- They also serve as structural support for sockets, switches, and other fittings, holding them in place and preventing damage.
- Back boxes make it easier to access and modify wires during maintenance and upgradation of electrical fittings.
- Lastly, aesthetic appeal. Flush-mounted back boxes, in particular, offer a sleek, clean finish. This is ideal for those who don’t want to compromise on their space aesthetics.
Choosing the right electrical box
There are multiple factors that you need to keep in mind before choosing an electrical back box. Here are some of them:
Material
The material of the back box will directly impact its durability and longevity. The two common ones are metal and plastic. Metal boxes made of steel or galvanized steel add robust protection to your electrical system. They are particularly made keeping in mind the high-traffic or industrial areas. Plus, they are highly resistant to fires.
In contrast, the plastic boxes are lightweight and corrosion-resistant. Although they are easy to install, they are not ideal for environments with high temperatures.
Size and Depth
The thumb rule is simple: The back box should comfortably accommodate for the number of cables and devices within. Thus, it is important to keep the size and depth in mind. The single-gang boxes are made for one switch outlet, whereas the double-gang boxes are for two switch outlets. Similarly, deep boxes are for accommodating multiple wires or bulky connectors. They prevent overcrowding and ensure proper wire bending radius.
Weatherproof and IP Ratings
This is especially important for back boxes designed for outdoor use. The Ingress Protection or IP ratings gives you insight into how well the back box will protect the wires against dust and water. Look for IP55 or above for outdoor back boxes.
Earthing Terminals and Knockouts
Earth terminals offer grounding to the metal back boxes which may become live during faulty electrical connections. Consequently, earthing saves you from electrical shocks. Another important feature, knockouts, determines the flexibility with which you can route cables. Since different back boxes have different numbers of knockouts, determine which will suit your needs the best.
Conclusion
Electrical back boxes are a must-have in your electrical system if you want to ensure safety and longevity and meet compliance standards. Falling short of meeting these local, national, or international regulations can not only result in financial penalties but loss of human lives in extreme cases. PowerSolutions has a range of high-quality electrical back boxes in varying types. Our experts are here to guide you in choosing the perfect fit for your needs.