Neutral, where does it come from? What is it for?



What is neutral in electrical? How many volts is there in neutral? What is neutral for? Does neutral cable shock? Where does the neutral come from? All the answers to these questions and many other curiosities and functionalities about the neutral in electrical you can check now, come on guys!

What is neutral?

The neutral conductor is a circuit or system element that presents the electric current and the null electric potential difference, regardless of its shape or nature. But even with these characteristics, he can be an active driver.

How many volts is there in neutral?

In normal situations, the neutral should always be at zero volts or as close as possible. Therefore, if there is voltage in the neutral it means that there is an imbalance between the phases. Knowing this, we can answer another common question that is whether the neutral cable gives shock!

What is neutral for? Know the importance of the neutral cable for the electrical installation.

If you understand the previous explanation well, you know that you should never shock the neutral when there are no loads connected, if this happens it is a sign that something of a serious problem is happening in the installation, but when there are loads connected, you can rather be shocked in neutral because even if there is no voltage, there is current.

Where does the neutral come from?

The neutral conductor that exists in homes, has its origin in a three-phase system of a transformer and to facilitate its understanding, follow this reasoning. In the transmission system of the concessionaire, there are 3 cables reaching the transformers and all are phase cables. At the output of the transformer, there are 4 cables, 3 of which are phase and 1 is neutral, as shown in the image below.

Understand how the transformation of electric energy happens.

To understand the exact point where the neutral appears, it is important to know about the operation of a transformer and the types of closing of the coils of this equipment, if you want to go deeper, we recommend this additional reading! To summarize, the transformer coils can be closed in a star or triangle, the neutral only appearing in star closure systems, as shown in the image below.

See what the star and triangle closure system looks like

Note that the neutral appears exactly at the point of connection of the coils with a star closure system. This occurs, due to the lags between the phases and that point of union of the star is a mathematically null point, that is, it has 0V. This null point is what we call neutral and that is where the neutral cable comes from, right from the place where the phase loads cancel each other out!

In this video below the Mundo da Elétrica channel you have a complete explanation of where the neutral comes from. In the video you can also learn more about the operation of transformers and understand the star and triangle connection systems, it is worth checking out.

What is neutral for?

The neutral is essential for the balance of the installation because it is the reference point for the phase of an electrical circuit. The neutral can also be used to close a circuit, allowing the circulation of electrical current.

We cannot close this article without saying what the NBR 5410 standard says about the neutral. Contrary to what many people imagine, the standard does not require the use of colors to identify cables, but if color is used, the neutral should always be light blue.

And so we finish this article and if you have any questions, leave them in the comments that we will answer.