ENTENDA O ESQUEMA DE ATERRAMENTO TN-S - TEORIA E PRÁTICA.

🎁 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... __________________________________________________ Download the video slides, print them, and take notes to improve your learning. 😉 Link to download the material: https://bit.ly/esquema-aterramento-tns __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ “THE FAMOUS TN-S GROUNDING SCHEME”. Electricians and professionals in the electrical field sometimes get confused when trying to understand grounding schemes. After all, there are several: TN-S grounding scheme; TN-C grounding scheme; TN-CS grounding scheme; TT grounding scheme; IT grounding scheme. It seems that the NBR-5410 standard complicates more than it simplifies. But if we start to understand the fundamental principles of a grounding system, it becomes easy to understand the application limits and main characteristics of each grounding system. In the description of this video, we will try to help by detailing a little more about the TN-S grounding system. What do I need to know about the TN-S grounding system? There are THREE very important things you need to know: 1- In the TN-S grounding system, the protective conductor PE and the Neutral are separate, that is, there is one conductor for each function. 2- The Neutral conductor and the protective conductor PE are directly or indirectly connected to the BEP; 3- Every ground fault in the TN-S grounding system is considered a direct short circuit since the neutral is connected to the protective conductor PE through the BEP. BEP = Main Equipotential Bonding Bar. So, if the neutral and protective conductor are indirectly connected, I can consider that if a fault current occurs, it will only encounter resistance along the way from the cables, and this resistance will be high enough to trip the protective and disconnecting device (circuit breaker). The above statement is true, and there are ways to calculate this cable impedance to ensure that the circuit breaker will trip when this fault current occurs. But what if someone comes into contact with this energized casing at the exact moment of the fault? For these cases, there are supplementary protection devices, which are 30mA RCDs (Residual Current Devices). The standard requires the use of these devices in specific locations such as: wet areas, outdoor areas, etc. Consult the NBR-5410 standard, which details the locations where the use of an RCD as a supplementary protection device is required in the case of using a TN-S grounding system. What electricians and electrical professionals sometimes confuse is thinking that a good grounding system is one that will conduct the fault current to the ground and this current will disappear into the ground. That's not how it works. When a fault current is directed to the ground, it will always seek a return to the source, and an efficient grounding system is one that, when a fault current occurs, must disconnect the protection device, indicating that there has been a fault in that circuit. In short, one of the objectives of grounding is to offer a return path to the source for the fault current so that a protection and disconnection device can detect this leakage current and act. Thank you for watching our video and I hope you enjoyed it. Until next time. 💡 Stay tuned for #electricity 💡 ________________________________________________________________________________________________ 👇 Most Watched Videos: What they DIDN'T TELL YOU about the CONTROVERSY of the 3-PIN SOCKET. 🎥 https://bit.ly/2JE4P07 How to Make Curves and Level Changes in Cable Trays. 🎥 https://bit.ly/2ABlrk4 Higher Voltage, Lower Current: Truth or Myth? We Prove It For You (Part 1). 🎥 https://bit.ly/2xvtzRB Do You Know All the Functions of Wire Stripping Pliers? 🎥 https://bit.ly/2GD5Sun What's Best for Branch Connections in Electrical Panels? We Tested It For You, See the Result. 🎥 https://bit.ly/2MDdrHl We Connected 3 Lamps in a Star Connection without Neutral. Does it Work? The Result is Impressive. 🎥 https://bit.ly/2BzUkH1