Terminal Box Vs Junction Box



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Electrical systems need a large number of components, each of which has a specific purpose, and enclosures are an important element of that equation. Switching one for the other, although not a horrible concept, may be disastrous. As a result, you must work with the correct team, one that understands the distinctions and how to manage each one appropriately.

In this article, we’ll look at the major differences between a Terminal and a junction box. Continue reading!

Junction Box

Waterproof Junction Box
Source: Pinterest
A junction box, sometimes called a j-box, is a protective box that connects all of the power supply cables. These boxes are also affixed to the roof, the wall, and the concrete plaster. These junction boxes may be found in almost every house and workplace. It would not be incorrect to state that they are a significant element of a building’s electrical wiring system. All of the wirings are protected in this box. You may typically get them in two sizes: five-wire and three-wire boxes.

Uses of a Junction Box

A Person Using a Camera
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The junction box can be used for a variety of purposes. To begin, we will state that safety is its major application, as it is utilized to protect electrical connections from rats and humans. The junction box, as defined, is a tiny box that shields the electrical wire terminations from external influences in order to ensure their safe functioning. Aside from that, there are a slew of other applications, which we’ve listed briefly below.

These also aid in the simplification of a building’s electrical wiring. In most buildings, each junction box represents a distinct wiring segment. The entire home is protected by larger junction boxes. Any form of an electrical job becomes considerably easier with such a well-coordinated setup. In general, we can claim that the life of an electrician would have been more difficult if junction boxes had not been invented.

How to Choose the Best Junction Box

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As we all know, several types of junction boxes exist based on their structure and the number of wire connections they include. As a result, selecting the proper one is critical, and this is totally dependent on the demand. Many questions arise, such as whether you need a waterproof junction box or an interior junction box, and so on.

To assist you, the following points will assist you in selecting the appropriate junction box.

Types of Junction Boxes

Round Pan Junction Boxes

Round Pan Junction Box
Source: Pinterest

Round pan boxes are shallower containers with a maximum depth of three-quarters of an inch. Most contractors install light fixtures or smaller objects in the ceiling or wall; the optimal usage is for goods weighing less than 50 Pounds. Ceiling fans can be put in specialized metal pan boxes, nevertheless, most models will not be able to bear the load.

Metal and Plastic Junction Boxes

Waterproof mental junction Box
Source: Pinterest

The bulk of boxes are constructed from metal or plastic. The task will decide what kind of material you use. A metal box is used when wires will be routed through a metal conduit to a box. The grounding of the conduit and wires will be aided by this material.

If the cable is not made of metal, a metal or plastic junction box is utilized. A cable clamp is used while attaching the connection to the box. As a consequence, it’s perfectly safe.

Octagon and Round Junction Box

Octagon and Round Junction Box
Source: Pinterest

Octagon and circular boxes, based on the size of the box, offer a little more flexibility. These boxes are commonly used in ceilings or walls for light fixtures and ceiling fans weighing up to 50 Pounds. For setups that require more wiring area, round or octagon boxes are suitable. If necessary, larger units can be utilized as junction boxes.

Sizing of Junction Box

A junction box-sizing is quite simple. You don’t need to compute the minimum and maximum volume of a junction box since it’s standardized. Instead, read thru the guidelines chat to determine the minimum and maximum volume of the junction box.

Key Difference between a Terminal Box and a Junction Box

Terminal boxes are used for particular connections when there is no room for future extension or where the expansion of connections is not required in the future. On the other hand, a junction box has a small footprint and lots of working area. New connections might also be planned for future development.


The terminal box and the junction box are one and the same thing. Now, since they are an essential part of the electrical solution, working with a brand like eabel will be the best decision you’ll ever make. Contact Us and be assured of quality products and our staff are qualified to help you throughout. Best of luck!

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