HOW TO SIZING CIRCUIT BREAKERS - STEP BY STEP IN ACCORDANCE WITH NBR-5410. скачать в хорошем качестве

HOW TO SIZING CIRCUIT BREAKERS - STEP BY STEP IN ACCORDANCE WITH NBR-5410.

Link to purchase the Electrical Calculations Spreadsheet: https://hotm.art/ytd-planilha-calculo... Link to purchase the Load Panel Calculation Spreadsheet: https://hotm.art/ytd-planilha-quadro-... Link to purchase the Electrical Plant Sizing Spreadsheet: https://hotm.art/ytd-planilha-plantas... __________________________________________________ If you like the Eletricity channel and want to contribute to the generation of quality content, then access one of the options below: PIX KEY 👉 [email protected] QR CODE 👉 https://bit.ly/doacao-pix __________________________________________________ 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 __________________________________________________ Before we talk about sizing the circuit breaker, I invite you to watch the first video in the series where we will teach you how to size the conductor: Video link: https://bit.ly/3654ITo After sizing the conductor, the following question arises: And now, how do I size the circuit breaker? The answer to this question can be found in NBR-5410, in item 5.3.4.1. In short, this item states that in order for the conductor protection to be ensured, it is necessary that: a) "Ib" is less than ="In" is less than ="Iz"; and b) "I2" smaller = "1.45Iz" Where: Ib = Design current of the circuit; In = Nominal current of the protection device; Iz = Current carrying capacity of the conductor; I2 = Conventional operating current of the circuit breaker. In this formula given by the standard, the most important thing to note is that the operating current of the circuit breaker must be less than or equal to 1.45x the current capacity of the cable. Only by meeting this prerogative can you ensure that the circuit breaker will trip before the cable is damaged. In short, it is very important that the circuit breaker is dimensioned in such a way that it is coordinated with the dimensioning of the conductor, and the standard makes this very clear as mentioned above. When sizing the circuit breaker, we must be careful not to confuse “corrected current” with the design current. They are completely different from each other: Design current – ​​This is the current that will flow through the cable to supply the load. This current is found by knowing the electrical characteristics of the load (power, voltage, etc.). Corrected current – ​​This is the current that serves as a parameter to facilitate the location of the correct cable in the standard table after all the correction factors have been applied. Once the cable has been located, its table current must again be corrected to the maximum conduction current, considering the correction factors used. It is through this corrected current that we will be able to find the appropriate value for the circuit breaker that will protect the cable. In the future, we will talk more about other sizing methods to keep electrical professionals informed about the need to know and apply the requirements of the standard when sizing cables and protection devices. I hope this video has helped you understand in practice a concept that is so forgotten by some professionals. I hope to see you in the next videos. 😉 A hug to all. 💡 Tune in to #electricity 💡 __________________________________________________ 👇 Most Watched Videos: What they DIDN'T TELL you about the 3-PIN SOCKET CONTROVERSY. 🎥 https://bit.ly/2JE4P07 How to Make Curves and Unevenness in Electrical Cable Trays. 🎥 https://bit.ly/2ABlrk4 Higher Voltage Lower Current, Truth or Myth? We'll Prove It for You (Part 01). 🎥 https://bit.ly/2xvtzRB Do You Know All the Functions of the Wire Stripping Pliers? 🎥 https://bit.ly/2GD5Sun What's Best for Branching in Electrical Panels? We Tested It for You, See the Result. 🎥 https://bit.ly/2MDdrHl We Connected 3 Bulbs in a Star without Neutral. Will It Work? The Result is Impressive. 🎥 https://bit.ly/2BzUkH1 We Tested the WAGO 221 Connector and the Result Was Incredible. 🎥 https://bit.ly/2PknMoz Insulator Test. 🎥 https://bit.ly/2wEYcDV Connection Test. 🎥 https://bit.ly/2MHQdzZ_ Do You Know Threaded Rivets? Do You Know How to Use Them? 🎥 https://bit.ly/2J8bSMC We Tested the Porcelain Connector. 🎥 https://bit.ly/2AddKRh __________________________________________________ Production and Editing. 🎬 Adoniran Freitas 🎬 Afrânio Freitas 🎬 Maecilei Leal 🎬 Dálcio Araújo __________________________________________________ Support: Life Print Company. 💻 http://printcompany.com.br/site/