Which Junction Box should I use?

Electric installations are complicated systems because they involve a variety of elements, such as circuit breakers, sockets, switches, conduits, cables and other equipment. Since many of the details are hidden from view, not much importance is given to how the installation is organized. However, it is extremely important that everything is in order to avoid overloads or any other problem in the electric grid. Thus, the junction box is where the electrical connections, cables and wiring are distributed.


What does a Junction Box do?

As its name says, it is here where the wiring is branched out and connected to the grid, establishing connections between cables and to sockets and switches. And when the direction needs to be changed, it is the electric junction box that keeps the distribution of the wiring in order. It is there that wiring can be installed and where repairs can be made to cables by subdividing the wiring and avoiding the tangling of cables.

Is the use of a Junction Box mandatory?

Now that we know of how useful the junction box is, we now need to know that there are 3 situations for which a junction box is mandatory. According to NBR norm 5410, which regulates the use of conduits and junction boxes, junction boxes must be placed:


  • At points of splicing or circuit branching;
  • At conductor entry and exit tubing points, with the exception of points of transition to the line in conduits;
  • When tubing segmentation is needed.


Splices and connections must always be inside the junction boxers, so as to facilitate inspection and maintenance services, when needed.

How can I install a Junction Box?

In order to correctly install junction boxes, to facilitate potential repairs and ensuring power continuity, they must be correctly placed in terms of horizontality, alignment and leveling regarding the point of installation. The Kraus-Muller junction boxes offer a patented solution to facilitate installation by way of stamped marks, thus increasing efficiency and installation quality. The perforations in the junction box for the positioning of the conduit must be made with proper equipment, to ensure that there are no tears.

How many junction box models are there?

There is a wide variety of junction boxes available on the market that can fit into any type of project. Different sizes, capacities and purposes. They may be square, rectangular or circular, but they are normally made of thermoplastic.


The most common model is the overlap. Overlapped junction boxes are the ideal solution for a variety of applications. Here are some examples:


  • For use in CC TV cameras;
  • For control boxes;
  • For industrial automation;


This is our explanation of junction boxes. Follow our updates on our blog and find out more about the importance of secure electrical installations and the use of quality materials, such as cable glands and conduits, see for yourself!


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