Posso USAR um CABO 6mm + outro de 4mm no lugar do 10mm? 🤔

⚡️ FREE CLASS: How to Do a Complete Electrical Installation From Scratch, Easily, Even if You're Not a Professional Electrician: ➽ https://eletr.co/aula?utm_content=yt1... ------ 📣 FAAALA ENGEHALL COMMUNITY 📣 Join our WhatsApp community to receive valuable tips and news in the electrical field, important information, and much more. 😉 👉 https://eletr.co/fala-eng?utm_content= ------ Did you like this video? 😍 ✔️ Leave your comment and share with your friends ✔️ Follow our networks ➽ https://eletr.co/links - - - - - - - - - - - - - - - - - - - - - - - - - - - - Can I USE a 6mm² cable + another 4mm² cable instead of a 10mm² cable? “André, I need to connect a 127V shower using 10mm² cables, but I don't have that cable. If I use a 6mm² cable plus another 4mm² cable together for each phase, do I run any risk? Do I lose conductivity?” My dear, if you received a question like that, what would you answer the person? That sounds more like a crazy idea, doesn't it? So, I received this question from a subscriber and ended up intrigued. In a way, he followed a mathematical logic: 6 + 4 = 10, nothing wrong so far. But in practice, what happens if we start from this logic? Curious too? Then leave a like and subscribe to the channel! We've been answering many interesting questions, don't miss out on our group, and activate the bell so you're notified of new videos. Now, let's find out what happens with that logic in practice! Hey everyone, welcome to another video in the Engehall Crazy Idea series! Let's consult the standard to see what NBR 5410 says about the use of parallel cables! Item 6.2.5.2.1 states that "The current carried by any conductor, during prolonged periods of normal operation, must be such that the maximum temperature for continuous service given in Table 35 is not exceeded." And this is Table 35 of the standard. Notice that it indicates the maximum temperature the cable can have in continuous service. Okay, but why do we need to know about this item? Because when we consult item 6.2.5.7, which mentions CONDUCTORS IN PARALLEL, see what is written in item 6.2.5.7.1: “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 this end: a) measures must be taken to ensure equal current division between the conductors in parallel, as per 6.2.5.7.2; Item 6.2.5.7.2 states that “The requirement presented in the first paragraph of 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.” Okay, look closely! Here we can see that in order to use cables in parallel, they need to have the same gauge and the same length. This means the resistance will be approximately the same, varying slightly higher or lower. Furthermore, there can be no branches along the way. So, answering the question from the beginning of the video! YOU CANNOT USE 6mm² and 4mm² cables together instead of a 10mm² cable, because they have different cross-sections, and it's clear in the standard that this is PROHIBITED! But this raises another question: "Ah, André, does that mean we can use two 6mm² cables to connect this shower?" I'll answer that in a moment, just don't forget to share this lesson with your friends by clicking on that crooked arrow above, send it to them so they can watch and learn with us too! Well, according to the standard, respecting everything I've already said, yes you can use them, but hold on, I personally don't recommend it and I'll give my personal opinion now! When we talk about high currents, I understand the need to use two or more cable legs per phase. This type of connection is very common in industries, large projects, and even by power utilities. Our local utility, CEMIG, in its ND5.3 which addresses the Supply of Electrical Energy in Medium Voltage Overhead or Underground Distribution Networks, shows in its table 1 the option of connecting the phase and neutral conductors with two, and even three legs, as we can see. This is also where the term "two-leg circuit" comes from.