Have you ever been in a situation where you measured the voltage of an outlet with a multimeter and found the correct value, whether it was 127 or 220V, but when you turned on the device, it didn’t work? Do you want to know why this happens in theory and in a practical test? Then check it out! _________________________________________________ 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 straight to your email! Sign up using the link below: ???? https://bit.ly/cadastro-eletricity __________________________________________________ ???? Check out our content ???? ???? https://linktr.ee/Eletricity __________________________________________________ Recently, our follower Cláudio Predes sent the following message: “Good afternoon, my friend. I would like to ask a question, maybe even a suggestion for a video. I went to a client's (single-phase) and one of the outlets had about 120V but the refrigerator didn't work. I used my Habotest (an outlet tester sold on the internet) and then I could see that there was no neutral, but with a multimeter it showed 120V or so. I found a neutral near the outlet and re-energized it... I would like to know why the multimeter showed 120V?” There are basically two very common situations for electricians in which we can measure voltage compatible with the installation but no equipment works if it is connected in this location. I don't even have a short circuit when touching the two conductors together. The first situation would be in the conductors of a switch. Note that with the switch off I measure my phase and neutral voltage, but as soon as I turn on the switch the cables are joined and there is no short circuit. I measure voltage because one of the multimeter's leads is on the phase and the other is on the neutral reference that passes through the load. But what about a situation like the one our follower reported? Why was he able to measure voltage even with the neutral cable disconnected? This happens basically for the same reason that we can measure voltage by holding one of the multimeter's test leads with our hands and touching the other to the phase. We have already condemned this practice here on the channel in this video ( • DO NOT USE THE MULTIMETER LIKE THIS – UNDERSTAND ... ). In the video we explain that the multimeter detects voltage by capacitive coupling, that is, one of the leads is in the phase and the second reference, which would be the ground, is obtained because we function as a capacitor. We are one of the plates and the other is the ground. The dielectric would be my shoes. In the case of conductors, it is the same thing. Even with the neutral broken, I can measure voltage by capacitive coupling. One of the multimeter's test leads is in the phase and the other in the conductor, which would be the neutral. The copper part of the conductor is one of the plates of my capacitor and the other is the conduit, the clamps, the wall or even the ground, since all of this is interconnected. The dielectric is the conductor's insulating layer. Since we have a certain length of cable, this improves coupling and I can measure voltage values ​​up to the nominal value of my network, but I can't get a device to work. Let's see it in practice? But first, make sure you're subscribed to the channel, if not, subscribe. And if this video was useful to you in any way, share it and leave a like. Don't forget to follow us on social media Facebook, Instagram and Tik Tok. We show that it is possible to measure voltage values ​​even with a disconnected conductor. Knowing how certain phenomena occur can help in diagnosing problems and this is the way the Eletricity channel found to share knowledge and make the electrician's life easier. See you next time! ???? Tune in to #eletricity ???? __________________________________________________ ???? Most Watched Videos: We Threw a Hair Dryer in the Bathtub. What Happened? ???? • HAIR DRYER IN THE BATH CAN MAKE YOU... We debunk the myth of the shower incompatible with IDR (DR). ???? • WE DEBUNCH THE MYTH OF THE INCOMPATIBLE SHOWER... What THEY DIDN'T TELL YOU about the 3-PIN SOCKET CONTROVERSY. ???? https://bit.ly/2JE4P07 Ground and Neutral, Together or Separate? Why Has No One Told You This Before? ???? • GROUND AND NEUTRAL, TOGETHER OR SEPARATE? W... Where Does the Neutral Come From? How Does It Appear in the Transformer? Find Out in This Video. ???? • WHERE DOES THE NEUTRAL COME FROM? HOW DOES IT APPEAR ... Autotransformer x Energy Bill. You Can Save Up to 30 Reais If You Follow This Tip. ???? • AUTOTRANSFORMER x ENERGY BILL.... Three-Phase Motor Inside - See How It Works In Practice. ???? • THREE-PHASE MOTOR INSIDE - SEE HOW IT WORKS...