Hi, I like to talk about the GCIF...? No, GC... Ground Fault Circuit Interrupter Outlets, G... They are typically installed in washrooms and are an essential safety feature. In my last video, I talked about this girl that was electrocuted in the bathtub because she accidentally touched exposed wires. This would have saved her. Unfortunately, her frayed extension cord was not plugged into a GFCI outlet. You can watch my previous video about it. Now, I will demonstrate to you how this outlet saves lives IS THIS *THE END* OF THE LOVABLE IDIOT?!? Well... before I put myself at the mercy of technology. Let's test It differently. What the GFCI outlet does is that it senses the current. Any currents that comes out of the live wire must return to neutral to close the circuit. If it comes out of the livewire but doesn't return to neutral... ...it means that it's going to earth through an unwanted path The outlet would open its breaker right away to avoid the unwanted current flow. So if you are sitting in a bathtub full of water and you drop a toaster in it, the current would go to earth through the facet or drain plumbing that are shorted to earth. The outlet would cut the power right away and save your life. Ok let's test it out. It says 'test monthly.' There is a test button... ok, and the red light is off, so it's all good. Now if I plug in my wire and short the live, which is the black wire, to the earth, which is the green, the breaker should pop. *ZAP* Shi* #%$* That wasn't the outlet breaker, the whole washroom breaker popped! Ok then. If it's a dead short, the room breaker opens quicker than the GFCI. Now let's measure my body resistance. ...Around 300-400 K. So if I put a 330 kΩ resistor between earth and live, I suppose the breaker should open. This is a 330 kΩ resistor. Nothing. I guess I would be dead. But wait! Human body also has some capacitance. Mine... ...is around ...4-5 nF. Let's say that also doubles the current. So I guess if I use a 100kΩ resistor between earth and live to increase the current, this should pop Nupe. I guess I would be dead again. What's the current threshold?? Trying 56kΩ. Ow... WTF?!? I would be certainly dead I think! Okay, trying 10 kΩ *POP* SHi* Oh it popped. So that means 120V AC divided by 10kΩ, it's... 12mA! What the actual [BLEEP!] That's a very high and dangerous current! OK, I bought this GFCI outlet, so I can try it outside the washroom. And I connected a potentiometer between the live and earth to see exactly where it will trigger. Let's make sure we don't short anything *POP* High voltage makes me nervous as F!!!!! Let's check the potentiometer resistance. Pretty much 24 kΩ, which means 120V AC divided by 24 kΩ is exactly 5mA. So these things are designed to trip at fault currents of over 5mA. Again, it doesn't pop if your body is between live and neutral, it will look like a normal circuit. It only pops for currents over 5mA between live and earth. I think 5mA is a pretty high and dangerous current. But according to the information, you start sending electricity around 1 mA. I personally start sensing it around 0.5mA. 1mA is pretty painful for me. As it goes up around 10mA, It becomes extremely painful and can cause severe shock and muscle paralysis and death. 10mA and higher you won't be able to let go, which results in extended exposure to electricity that would result in death. Closer to 100mA, it becomes very hard to breathe and there is irregular heartbeats that would easily end your life. Above 100mA, you'll die. Breathing stops completely, and there will be severe burning as an added bonus. Of course, all these depend on the length of exposure to high current. For example, in case of the 25kV electrostatic discharge, the current through body is way more than 1A, around the microsecond. But that doesn't affect the healthy person. But if it's a fixed high voltage supply creating high current, you won't be able to let go. So according to this, 5mA is quite painful, but not lethal. And with my body impedance of over 100kΩ, with 120V AC across my body, there will be only 1 mA of annoyance. So does that mean that I can grab power lines with dry hands with no consequences? But I know that if I touch live wires I'll die... I think. So there should be a disconnect somewhere. OK, let me take my body resistance and impedance. I will run sometime through my body using my DC 30V as well as 60Hz 30V AC... ...coming from my autotransformer dry hands 30 volt DC around 0.1mA. Dry hand AC is... 0.14(mA.) Wet hand DC... around 0.6mA. Wet hand AC is around point 0.8mA. Soapy hand DC is around 0.89mA. Soapy hand AC... AW F*&# AW 1.3 1.4(mA)... AH [BLEEP!] Tongue DC... *CRASH* [BLEEP!] Tongue is very low resistance, so the current will be higher. Let's measure it at 3V! Okay, tongue at 3V 0.4mA. And AC 3V. 0.7(mA.) I don't get it! The GFCI breaker would hardly open even if I'm soapy! But I should die even if I touch the live wires with dry hands! Let's experiment a little bit with water. I have cold tap water, hot tap water, and soapy water. And I'm going to put the live and earth wires in each one of them to see which one triggers the breaker. Starting from cold. This one doesn't trigger. Hot water *POP* Ok, that one pops, which means that there are more chemicals in the hot tap water. So don't drink it much. And now the soapy water. *POP* Oh, definitely. So good news everyone! If you are in a warm shower, and you drop your hair dryer in the water, the breaker pops. Let's measure the resistance by running current through them with my 30V DC. We know any resistance below 24kΩ triggers the breaker. cold water Like around 1mA so 30kΩ, hot tap water 1.5mA or 20kΩ so it triggers, and the soapy water Is around 30mA, which means around 1kΩ! so I guess the lesson is always shower with warm water and add soap for additional safety, and make sure your hairdryer only falls into the water. Does this mean that Madison would not be saved even if there WAS a GFCI outlet? According to the report, she was in the bathtub and accidentally grab the exposed wires of a broken extension cord. According to my test. wet hand, even soapy hand hardly triggers the GFCI outlet. But then again the currents wouldn't be in lethal levels anyways. I must be missing something... Let's try again. Different voltage and current levels, may have different effects. I have my 30V AC here and I wet my finger and measure the current through it. You see the current is dropping? It would save me. Basically the electricity is removing the moisture from my skin and making it more resistive Okay, let's crank it up all the way to 120V. According to my tests over dry skin, It should only result in 1mA of pain. Let's try it - of course, this is very dangerous, never try this at home. Okay? Um, I only touch it with one hand and the rest of my body is isolated from electricity, so the current is limited to one hand. Erm... support my channel at patreon.com, because my family could use the money after my demise It's dry...right? at the current ree Ouch [bleep] {BLEEP!} $#!T {BLEEP!} I can't hold it steady. Too painful. Let's reduce the voltage a little bit. OK, let's do 100V. Ready? Should be less painful. Okay, ouch What? What the bleep? ? WTF?!?!? Is the current rising?!? AW (FU??)[BLEEP!] $#!T Seems like a higher voltage and currents the skin doesn't limit the current anymore. It is failing one way or another and it's resistance is dropping, increasing the current. Yeah, Madison would have been saved if her extension cord was plugged into a GFCI outlet. Her skin had already failed. She had burn marks on her hands. The current would be high enough to trip the breaker. Now let's do the real test. Does the GFCI open and save me? So I have one dry hand GFCI and the wires. I don't think it will open because it needs more than 5mA unless my skin breaks, which I don't think it does, before I pull my hand back from pain. So let's try it. Ouch $#!T This is nothing. THIS IS NOTHING FOR ME! Ouch Shi* ,ouch f(u?)** It doesn't open! Never, EVER try this at home! I'm doing with fuliy soap your hand to give it the best shot, otherwise, it'll be a hell of a pain. Sorry guys the pain is too much for me, but I'm sure it is *BANG* AW BLEEP!! S#!t IT OPENED! FUBLEEP! IT OPENED! Install GFCI in bathrooms people! Giveaway.... TIIIIIIIIIME For my viewers, I'll open the T-shop... Tea shop? ...open the T-shirt shop at teespring.com (tea spring) I'll pick two comments from my videos and award them 2 shirts of their choice. For everyone else, if I pass by you rocking one of these shirts. I'll run up you and shake your hands I have to buy one of those hand shockers or maybe make one Also, like to measure curves? I like to give away one of these great and powerful KEYSIGHT 1000 series scopes to my patrons at patreon.com Thanks a lot for your support and make sure to visit KEYSIGHTS channel for great knowledge on scopes CLICK ALREADY!
