I have been an electrician for 15+ years and we need to have, share and exchange more quality information like this. KZfaq is supposed to be like this, a place where you can learn. Thanks Mike holt for sharing your knowledge.

Mike Holt is a national treasure A living example of the spirit that built the nation, the shoulders we stand on today This is my humble opinion after watching many of his videos Thank you sir

Everything about that cute little ground wire every time I watch this has me dying. I can't get enough of it.

Fascinating, changes everything that I thought I knew. Thank you Mike Holt!

You ate the man, Mike. Thank you for all of your masterclasses.

much respect but the freak out at the end is comedic gold.

FINALLY, a discussion that assumes an elevated working knowledge of electricity in the target audience. Thank you. I'm resigned to listen to all your videos after ten minutes into this, my first one.

Thank you for sharing your knowledge

When he went off the rails and sarcastically ranted about NASA grounding their rockets I couldn’t stop laughing 🚀 Seriously though, when someone is PASSIONATE about what they say it becomes natural to listen and learn from them. Mike Holt knows his stuff and truly educates millions. You make the world a safer place Mike!

Great video and a point about Defibrillation stops the heart from fibrillating, think of it like rebooting the heart and letting it naturally regain a rhythm. It is a single shock rated in joules. It is not multiple pulses. Multiple pulses would be external pacing which would increase the heart rate but not typically used to restore a normal sinus rhythm

I was just looking for guides on how to create my own ground at home, but this video is very informative and fun to watch. Thanks for the info!

Hands down, the best presentation on the subject that I've ever seen. Thank you!! Sparks in Daytona

Another guy is saying you can't have too many ground rods. Of course you want everything in one path with a full return. But then how many bonds before a surge buildup. A whole city on one bonding circuit doesn't sound good either.

Thanks for the thoughts you have contributed here.

Those rods on poles, lights and even signs in FL are to protect pedestrians etc. Almost everything metal outdoors has a rod in FL now. You were on the right path when you got all emo talking about the ground rods around the shuttle pad. Lively video. I learned alot.

Very instructive seminar of 08/25/2018. 6:40 hours fully loaded. Thanks Mike

Mike. Your video was great explaining grounding in an electrical system.

LOVE THIS !!!!

I absolutely love this! I've learned more in this video than in class

So this would be the reason the Neutral and the ground would be connected in the main panel ( not in a sub panel ) , or would go back to the a neutral bar, to clear a ground fault ?

Thanks again for fighting electrical ignorance! Little do people realize that that rebar cage IS a very effective ground. Heck, even the concrete itself is considered ground. CEC allows one to encase their grounding electrode into concrete - can't site the rule atm..

So when put up an 20 ft ham antenna mast, I live in a mobile home, they advice to use a 8 ft ground rod to ground the mast. The ground of the coax should be bonded to the metal frame of the mobile home which is bonded with the power box in my home which is connected with the ground rod at the electric companies power box 25 feet away. It does not feel right somewhere. Any advice please?

very good information

the 30 volts and 15 volts for electric shock and hazard from death comes from the amperage that is required to stop the heart and using ohms law and an assumed resistant in a persons body is where the 30 volts comes from. I believe 0.1 amps can cause the heart to stop so assuming a person resistance is 300 ohms 30 volts could kill someone.

Nice one I'm Avid fan of your video

Need some instruction on concentric bends, please! Thank you!

I'm afraid to flip my light switch after watching this but thank you for the heads up to this diy'r

STEVE HOLT!

I would have subscribed when I finished college in 1990, I liked the video kudos

Sorry if i look dumb saying this , I'm new and on the process of learning to become an electrician... So the difference here between grounding and bonding , is that grounding is a myth? Using ground poles won't really protect you from high voltage? The bonding part is more effective , because you bond the ground to any metal type part and bring it back to the source so it can trip? If anyone can be kind enough to correct me if I'm wrong. Thank you.

When there is current through the human body, it is not necessarily electrons carrying the current. In some cases, it is positive sodium ions, like it is in our nerve cells.

Thank you for the quality videos. Keep it up. There is. Still plenty of false info out there!

..the distribution transformers have earth the neutral outside, why do we need to ground/earth it again indoor..?

Fib-rih-lay-tion De-fib-rih-lay-tor The heart consists of millions of electrical cells that charge and discharge. The heart is controlled by the brain. The heart has its own electrical pacing system. Theoretically, if you unplug the brain/heart connection but keep oxygenated blood flowing to the heart, it will beat on its own. The heart has 3 pacing sources, 1 normal and 2 escape (backup) systems. The normal pacing signal is given by the Sinus node located in the Atrium (the top half of the heart). It’s rate is 60-100 beats per minute. When the signal comes from the Sinus node at a rate of 60-100 it is called a Normal Sinus Rhythm (NSR). Slower than 60 from the Sinus node is called a bradycardia. Faster than 100 from the Sinus node is called a tachycardia. If the Sinus node is damaged from tissue or electrical damage (lack of oxygen via clogged artery or electrical shock) the heart will go into an Escape rhythm. The first of the 2 Escape rhythms comes from the middle of the heart and is called the Junction (Junctional rhythm). The junctional escape rate is 40-60 beats per minute. If the Junction is knocked out, the last escape rhythm comes from the bottom half of the heart called the ventricle. This rhythm is called an Idio-ventricular rhythm and the rate is 20-40 beats per minute. In the medical world it’s simply said to be an idio rhythm. The top and bottom half of the heart do not beat at the same time. Mechanical action occurs when the electrical system sends the signal to the cells. The normal discharge recharge cycle goes like this: Atrium-discharge (muscles contract and blood is pumped into the ventricle filling it up). The electrical signal sent by the Sinus node when it fires off travels to the ventricle, but it is intercepted by the Junction for a very brief moment, held and immediately released to continue on its way down to the ventricle. Recharging of the atrium begins. Ventricle-discharge, atrium recharge completes. Atrium - discharge, ventricle - recharge. Repeat 86,400 a day. When you are electrocuted ALL of the electrical cells in the heart discharge at once and there is no recharging. The entire pacing system is knocked out and the electrical cells in the ventricles begin discharging in total chaos. The ventricle is a quivering mass at this point. No blood is being pumped. A defibrillator discharges all the cardiac electrical cells at once and hopefully the Sinus node will step up and take over the electrical system again. After the defibrillator fires off, the first thing everyone does is look at the monitor screen to see if the electrical waves have changed out of ventricular fibrillation. If the heart returns to a viable rhythm (NSR is the ultimate goal) the term is Converted. “He converted back to Sinus”. If you survive an electrocution, you most likely will suffer permanent damage to your cardiac electrical system and suffer from various dysthymias for the rest of your life.

Sooooooo? Don't stick the fork in the wall socket?

The only problem i have with equipment grounding conductors is they have the potential to route lightning directly into your panel box. Any steel frame structure with steel siding beams and collumns is an equipment grounding conductor itself. Metal raceways should be used to limit the use of individual equipment grounding conductors and to save on copper. When the huge metal building gets struck by lightning it will track thru the columns and footings and will be diverted from the main electrical distribution center.

The incidence on page 1:20 may be avoided had transformer winding are floating off the ground. So what is the benefit of grounding networks upstream?

Isn't the ground rod for lighting too?

Acoording to you 25 second 40 amp going though body will kill heart then isnt that too long breaker to trip Mike ? Ark fault current intrapter shut off faster? When I see other test by easton ir levinton they open by 1 second by shortening wire I think those chart are way off?

plz make a vedio on how to size breaker and if there is kindly tag me there @ Mikehotnec

Some places require the earth as the return. Some utilities use SWER system where the earth is the neutral, it saves them the money of running a second wire for the neutral.

Is there any program like this for the Canadian code

Back to source ? . source on poul , nutro is connected at transformer on poul connected to earth ground anyway right so whats the deffarence ? Its going same earth ground

At 21:11, you mention it is a practice to *not* have an EGC. If this is the case, then I assume there is no ability to clear a fault. So does this mean someone needs to get shocked (or less commonly die) and report the problem to the city government to fix the fault?

Isnt nutro going to earth gound at end?

Where do I go to buy ur electrical exam busters

So a bonded propane furnace with an underground tank will always have at least two different ground locations per structure?

22:31-22:33 LOL.

at 13:46 when children insert keys, oh my gosh

Great video, except for a tiny bit of baloney between 10:01 and 10:16. Electric shock / fibrillation has nothing to do with the frequency, or how it matches with our "body frequency", also, our body DOES NOT run at 40Hz, we have various systems in our body, which run on various frequencies, which vary with time as well. The only part of frequency that is relevant to electric shock has to do with the penetration. For example, an RF signal frequency is too high to penetrate deep into the body to cause electrical shock, you'll get a burn instead. As long as the frequency is low enough, you'll get a shock and if the current is high enough you'll get fibrillation. If the frequency is high enough, you'll get a burn instead.

I'm a little thick headed. I think this is the 'BIG MESSAGE'. 15:48 "…So the concept of providing protection to people is to make sure everything that’s metallic is connected to an equipment grounding conductor. And we have to make sure that all of the equipment grounding conductors are connected ultimately back to the equipment grounding conductor at the source, which is going to be your grounding terminal and we have to make sure that we bond that equipment grounding terminal at the transformer to the system itself via the system bonding jumper. If you provided proper equipment grounding conductor, proper termination, proper connection all the way back to the source, that equipment grounding conductor, that supply side bonding jumper, that system bonding jumper and all those interposing connections back there is called the effective ground fault current path, and that’s how we get the electron from that fault back to the source to open up that protection device (the breaker). It’s that simple… Make all the metal parts connect to the equipment grounding conductor, connect it back over to the equipment grounding conductor at the source, connect the source over to the neutral, badda-bing badda-boom, we’re done. "

A lot of good info here, but I couldn't help but laugh my a$$ off.

26in:26sen...????? What is that means??

That's current

Also that "cute little wire" is not for lightning protection. It is to bleed of induced voltage to ground so anyone touching that pole won't get lit up (or dogs peeing on it as described in your grounding myths videos).

Its funny and sad how lot of engineers and tecnics think a ground rod solves all risks of fault current or electrocution.

Oh my goodness!! I cannot believe I just sat here and listen to a grounding and bonding video from Michael and had spent the entire video talking about electric shock give me a break!!!!

110 tickles.. 277..well it doesnt feel good at all 😲

23:40 - 24:14 lol

Voltage doesn’t push the electrons. Voltage is not doing the work. I get your concept but it’s technically false and wrong information.

This information is wrong. For one, it assumes that facility ground and power neutral are the same thing. All his models are based on this. Neutral and ground should NEVER be tied together other wise we are back before we had three pong electrical outlets. Poles are not supposed to be grounded it is the lightning rod at the top that is and it should be electrically isolated from the pole to create a 30% cone of protection. If you do not protect a metal pole that goes into concrete if lightning strikes it the instantaneous heat created by the strike will super heat the concrete and blow up the foundation that holds it up. This man is ludicrous. I guess this explains a lot of the shotty contractor work I see.