RISCOS DO ESQUEMA DE ATERRAMENTO TT – 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... __________ 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 __________________________________________________ 👇 Check out our content 👇 🔌 https://linktr.ee/Eletricity __________________________________________________ Basically, the TT grounding system is one where there is no equipotential bonding of metallic masses and also no equipotential bonding of the neutral with the TT grounding system. To assemble the TT grounding system, I have to create one or more grounding electrodes for metallic masses or specific equipment. It's that famous grounding system well known by many electricians where I place at least 3 rods in a triangle or in a line, and connect this grounding to the electrical panel (QDC or QGBT), but I don't do equipotential bonding of this grounding with the neutral (connection with the neutral) and I also don't do it with the other metallic structures. This is the famous TT grounding system. Now let's look at the restrictions of the TT system according to NBR-5410: The following prescriptions must be observed: a) In the TT system, for automatic disconnection aimed at protection against electric shocks, residual current devices (RCDs) must be used; b) The following condition must be met: RA x Idn must be less than or equal to UL where: RA is the sum of the resistances, in ohms, of the grounding electrode and the protective conductors of the exposed conductive parts; Idn is the nominal residual current of the RCD, in amperes; UL is the limit contact voltage, in volts. NOTE: The limit contact voltages for different situations, depending on the dominant external influences, are given in Annex C. When, in the same installation, there are masses in different situations (for example, some masses under external influences characterized as situation 1 and other masses in situation 2) and connected to the same grounding electrode, the lowest UL value should be adopted. Observing the texts of the standard above, we can conclude that the use of the TT grounding system requires the installation of an RCD (Residual Current Device) in all electrical circuits of the building. We can conclude that the TT grounding scheme is the worst grounding scheme that should be used. What ELETRICITY recommends as an adequate grounding scheme for both residential and building applications is the TN-S grounding scheme. Here on the channel you must have heard many terms such as "grounding scheme", "equipotential bonding", "grounding electrodes" and "BEP". Let's break down the terms a bit more so you can understand better: Grounding scheme – The format or characteristic of your grounding system according to the 4 conditions permitted by the standard (TN-C, TT, IT, TN-S). Equipotential bonding – Placing all (metallic) masses and metallic structures of a building at the same electrical potential. Grounding electrodes – The set of cables, rods, connectors, and other accessories that make up a grounding system. BEP – Main equipotential bonding bar. 💡 Pay attention to #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 Branching 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 We Tested the WAGO 221 Connector and the Result Was Incredible. 🎥 https://bit.ly/2PknMoz Insulation 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