POR QUE O NEUTRO TEM CORRENTE, MAS NÃO TEM TENSÃO?

🎁 Products we recommend: 🔗 https://meli.la/2njVbpU __________________________________________________ Automate your electrical calculations with our spreadsheets: Link to purchase the Electrical Calculation Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Schedule Calculation Spreadsheet: https://hotm.art/ytd-planilha-quadro-... Link to purchase the Electrical Plant Sizing Spreadsheet: https://hotm.art/ytd-planilha-plantas... __________________________________________________ Receive Eletricity content directly to your email! Register using the link below: 🔗 https://bit.ly/cadastro-eletricity __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ Why does the neutral wire have current but no voltage? Does the neutral wire give a shock? Although it seems like a simple question, many electricians still have doubts about it. I can tell you in advance that the question has some errors, but even so, we will answer it in theory and practice. In this video, we will use the most popular terms like "to get a shock" and "to give a shock" to facilitate understanding. The first thing we need to understand is the difference between voltage and potential. In our electrical system, we can say that the phases are at a certain potential, but not the same, as they are 120° out of phase, while the neutral is at another potential, theoretically zero. However, when we measure voltage between phase and neutral or even between phases, we are not measuring the potential, but the potential difference, or voltage drop. If my phase is at a potential of 127V and my neutral at 0V, the potential difference between phase and neutral is 127V. Note that if, due to a transformer fault, my neutral had a potential of 100V and my phase 227V, the potential difference between phase and neutral would still be 127V. We saw in two examples the same voltage, but with the neutral at different potentials. In our electrical system, the neutral is grounded both at the utility company's transformer and at the meters in our homes, so we can say that the neutral, theoretically, has zero potential and, surely, has the same potential as the ground. Here I take the opportunity to recommend three videos from the channel: "Where Does the Neutral Come From?", "Why is the Neutral Grounded?", and finally "What if the Neutral Wasn't Grounded?". In this last video, we show that, depending on the situation, it is possible for someone to suffer an electric shock from the neutral. So, regarding the question "Can the Neutral Give a Shock?" I can assure you that neither neutral nor live wires can cause electric shock on their own. If someone is completely isolated and touches one of these conductors, they will be at the same potential as the neutral wire. However, if I am in a potential difference, I am at risk of electric shock. So, I can be in contact with the neutral wire and accidentally touch the live wire. Who gave me the shock? The potential difference. Therefore, we prefer to answer that yes, depending on the situation, the neutral wire can give a shock. We understand that making certain statements can encourage people to feel safe in certain situations without considering certain possibilities. Electricity is not something to play with! Now, speaking about current, the truth is that neither live nor neutral wires carry current. Imagine a microwave outlet in a house. Without the microwave being plugged into that outlet, neither live nor neutral wires carry current. From the moment the appliance is turned on, if I have the correct potential difference, I have current flowing instantly, both in the live and neutral wires. Is there any example where we have live and neutral circuits with current in the live wire and not in the neutral? Theoretically, yes. In a balanced star circuit, if I have three identical loads, phase-to-neutral, in different phases and sharing the same neutral, I will have currents in all three phases and no current in the neutral. I say theoretically because in practice a 100% balanced circuit is almost impossible. So that's it folks, we've shown that in summary, the correct thing to say is that both neutral and phase have potentials, and as long as there is a load, both will also have electric current. Avoid controversies that add nothing but encourage making mistakes trying to prove whether A or B gives a shock. Stay focused on knowledge and on subjects that can really make a difference in your profession. Until next time! 💡 Stay tuned for #electricity 💡 __________________________________________________ Production and Editing. 🎬 Adoniran Freitas 🎬 Afrânio Freitas 🎬 Maecilei Leal 🎬 Dálcio Araújo