CONDUTORES EM PARALELO – DESCUBRA PORQUE EU POSSO USAR MAIS DE UM CONDUTOR POR FASE.

🎁 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... __________ 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 in your email! Register through the link below: 🔗 https://bit.ly/cadastro-eletricity __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ The NBR-5410 standard allows the use of two or more conductors per phase or neutral in an electrical installation, but it makes a series of requirements for this type of installation: In item 6.2.5.7 – Parallel conductors - The standard says the following: When two or more conductors are connected in parallel in the same phase or polarity, this should not compromise compliance with 6.2.5.2.1. To that end: a) measures must be taken to ensure equal current division between conductors in parallel, as per 6.2.5.7.2; or b) a specific study must be carried out on the current division between conductors in parallel, so that compliance with 6.2.5.2.1 can be addressed for each conductor individually. Now let's see what the standard says in 6.2.5.7.2: “The requirement presented in item a) of 6.2.5.7.1 is considered met if the conductors in parallel have the same constitution, the same nominal cross-section, approximately the same length, and do not present derivations along their path.” We have already seen what the standard says, now let's see how the currents behave in this type of connection. We know that in a conductor, the current carrying capacity is directly proportional to the area (cross-section) of this conductor and inversely proportional to its length. This is because each conductor has a resistivity constant of the conducting material, which can be calculated using Ohm's second law. We won't go into the details of the formula here, but you can easily find it on the internet. So, for cables of the same length and material, there are two situations for the electric current: a) If the cables have the same nominal cross-section, the electric current will divide equally between them; b) If the cables have different nominal cross-sections, the electric current will not divide equally between them. But why do I use conductors in parallel to carry large electric currents, and why does the standard allow this type of application? One explanation is the skin effect that occurs when a conductor is traversed by an alternating current. I have a magnetic field that expels my electrons by repulsion to the ends of the conductor, leaving the central part of the conductor free and the electric current circulating along the edges of the cable. At 60Hz, which is our working frequency, also known as industrial frequency, this skin effect will only occur from approximately 8mm depth. Therefore, in cables with small nominal cross-sections, the skin effect will practically not occur, but when it is necessary to use cables with large nominal cross-sections, such as 300mm² for example, then we have to pay attention to the occurrence of this effect. That is why it is very common, especially in industries, to use more than one conductor per phase for electrical power supplies to high-power equipment that requires large electrical currents. The main objective of this type of connection is to reduce the skin effect and optimize the use of the conductor for maximum current carrying capacity. Remember that to make this type of connection, studies and analyses need to be done, so do not make this type of connection in residential circuits. 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