Why is a ground wire used?
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- čas přidán 5. 12. 2022
- Do you want to know what purpose ground wire serves? In this video, we'll discuss the basics of ground wire and its importance.
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This ground wires is an essential for safety measures. Without it, you can experience electrical shock if you come in contact a metal(if there are some source of leak inside the wire). I have an experienced when touching washing machine as when I was a kid. It was painful.
Not if it's SELV.
This isn't accurate.
1905 to 1940. No ground wire. No hole in the duplex receptacle to insert anything.
@@RobMrowiec 🤣 enjoyed the chuckle 👍
@@RobMrowiec 🤣
A lesser mentioned benefit of the ground wire is it comes in handy endlessly when troubleshooting. For example if a device is acting like it doesnt have power, due to an open neutral situation, if all you had to measure voltage across at the outlet were hot and neutral you may read 0 or very little voltage, even though you DO have the full potential of incoming line power. The full voltage drop is occuring at the point where the neutral is open. Measuring hot to ground at the receptacle in this instance would read ~120 volts
Wow! This is very informative, thanks for sharing it with us. It worth it and the best tutorial on the topic for me.
thank you you for your continuous efforts!
Thanks for this explanation on what a ground wire is.👍
Ty for all of your video. You have truly gave me so much knowledge and are a big part of why I love electronics so thank you so very much for all you do and your time!!!
It also helps reduce electrical noise, such as with audio recording equipment.
Thank you for sharing your knowledge
very educative. Thank you
Great video Thank you
Thanks for the great videos!!!😅
Thank you 🙏🏾
Helpful video, tho I found myself struggling to know which part you were talking about. Possible to use a pointer or highlight stuff?
Thank you
You are the best 🎉
Nice 👍🙏. GOD bless..
This only covers the bonding of anything conductive that could become energized in the event of a live conductor fault coming into contact with it, such as the metal case, via a low impedance wire, the grounding conductor, back to the breaker so as to quickly cause a fault current causing the breaker to trip clearing the danger. Prior to this "safety" ground bonding via a dedicated grounding conductor, a hot fault to a metal case, or pipe, etc., would wait until someone or something became the path to ground causing electrical shock.
It is tied to to, but different in purpose from the grounding electrode/grounding electrode conductor bonded to one live conductor to create the neutral and create a parallel circuit to cap the voltage spikes from induced currents caused by lightning, or inductive load switching via a ground path between the grounding electrode at the transformer and the one at the service entrance. (Note there are other types of utility service provisions that handle this differently in some areas, but this is common in US detached residential electrical service) The voltage spikes from induced currents created the chance of arcing and hence fires. Think all the simulated arcs in the Hollywood depiction of Frankenstein's laboratory during the electrical storm. The doc needed a good grounding electrode/grounding electrode conductor set up, but he was in a stone castle so fire was less of a risk.
Bro best video
I’m new to this so bare with me. If there is a ground wire coming out of the Romex wire (that has hot, neutral, and ground) and if im installing a ceiling fan, do I have to wrap the ground wire (from the ceiling fan) to the ground screw of the metal box? Or can I just pigtail the ground wire of the ceiling fan to the ground wire of the romex?
Just bond the box as well. Bit safer
Seeing the neutral return through the transformer and back into the service through the hot wire, does the smart meter differentiate between newly pulled power to use for other devices and the recycled power, or does it just continue to charge you for electrical usage anyway despite a small portion of the power consumed actually being returned from other devices that are powered at the same time? 🤔
I'm not sure I understand your question, transformers are separately derived systems. The definition of a separately derived system per NEC is "An electrical power supply output, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.". When would you carry the neutral through?
The meter will always be running though, even under no load. From a website I found "No-load losses are caused by the magnetizing current needed to energize the core of the transformer, and do not vary according to the loading on the transformer. They are constant and occur 24 hours a day, 365 days a year, regardless of the load, hence the term no-load losses. They can be categorized into five components: hysteresis losses in the core laminations, eddy current losses in the core laminations, I 2R losses due to no-load current, stray eddy current losses in core clamps, bolts and other core components, and dielectric losses. Hysteresis losses and eddy current losses contribute over 99% of the no-load losses, while stray eddy current, dielectric losses, and I 2R losses due to no-load current are small and consequently often neglected. Thinner lamination of the core steel reduces eddy current losses."
are there any countries where the outlets dont have a ground wire connection? if so, is it due to an alternative safety measure which would be great if you could cover.
In germany oprating rooms don't use a ground connection in this sense. It just shows a warning light and everything continues to function as usual. Nobody gets shocked because everything is highly isolated and critical appliances won't just lose power.
Power Plug CEE 7/16 Alternative II, aka "Europlug" does not have a PE connector. But it is only allowed up to 2.5 Ampere.
Any PE wiring from the casing or upstream wiring is connected to the Neutral.
If there is s shortcut it will work just as well, while the device stops working entirely if neutral is cut.
It is a whole lot more space efficient, and you need a contrived situation to cause any danger.
Half of the outlets in my house don't have a ground.
USA
Need the adapter that doesn't use ground
Fun fact there are no ground wires in Chicago homes nor is it required since everything is bonded through the conduit.
Oh yeah! Very clever! But what about if the conduit breaks!?
Excellent video !!
Can you ground an outlet by just running a wire from one grounded outlet to another ungrounded outlet? That's how I grounded an outlet on the other side of my bedroom, ran a wire from the grounded box into the basement up into the ungrounded box and connected just the ground and cut the unconnected white and black
Yes
Question: why is the ground wire routed all the way back to the ground bar in the breaker box? Why not just jump the neutral to the ground at the outlet?
There needs to be a common point for connection to the ground rod.
Wouldn't that have it ground out through the entire circuit while it's making its way back?
Bro i like your videos♥️
This was the question that was keeping me up at nights. To hell with all of that existential crap. Forget about the meaning of it all. I wanted to know WHY GROUND WIRES? And now I know. And I can die a boring man. Cheers.
So if you didn't have a ground wire connected and a short occur, the circuit breaker will never trip then? Or will it still trip?
I think it would trip because you would be acting as the ground or earth wire as the current flows through you.
@@WillCamx Oh ok, that makes sense. Hopefully the CB still tripping will save your life.
@@Passions A Residual Current Device or RCD will trip in time to save your life.
An ordinary circuit breaker probably not.
Seen our new incredibly detailed MCB video? link: czcams.com/video/gqEu9t8HwW0/video.html
So what is it used for?
I'm not sure this really answers why ground wires are used, in the example given you could simply bond the metal casing of whatever appliance to the neutral wire and achieve the same result.
Some old builings are made like this if im not mistaken
At least in EU systems earth is a separate wire all the way along. We have another „breaker“ (FI or RCCB) which detects missing current between neutral and live. If there is a difference of about 300mA, it will disconnect.
IMO it’s dangerous to just use ground as “backup wire” which increases the current so that your normal 16A breaker pops out.
Don’t you use RCDs, too?
@@goeppi8 Yeah the U.S. has a similar system although I don't think there are normally any breakers with that functionality, instead it's built in to the receptacles in areas such as the bathroom, and I think it trips around 15 mA or so difference between neutral/live, they're referred to as GFCI receptacles.
Sir, then why we don't use natural wire as ground (connecting the natural wire to the metal ) , because that will also complete the circuit and we will safe?
If not then what will happen??? 🙏🙏🙏🙏❤
If you were to touch the frame of a dryer for example while it was bonded to the neutral and came in contact with something grounded you are now giving the current an new path to the source. Instead of just receiving a shock from the voltage you now run the risk of running the load of the dryer through you. Less likely but has happened. (older dryers typically used the neutral as a ground in America but no longer do.)
so ground wire functions in a way to prevent the current flowing through equipment that is made of metal or stainless steel .. sorry for my english.. correct me if i am wrong.
The ground or earth wire is a safety feature. If the metal case of an appliance comes in contact with the live wire through a short circuit, the ground wire provides a path for the current to flow safely, rather than through you if you touch the appliance.
explain difference btw ground and earthing
Best video about this by far
Positive charges?
A ground wire is used to provide a safe path for electrical current to follow in the event of a fault or other problem in the electrical circuit. This helps to prevent electrical shocks and other potentially dangerous situations. In most cases, the ground wire is connected to the metal frame of an appliance or electrical device, which provides a low-resistance path to the earth and allows any excess current to be safely dissipated. This can help to prevent electrical fires and other hazards.
What wire is the grounded conductor? Answer wisely.....
Oh man, a spicy topic here lol! I remember when updating our curriculum recently when I had to research this and what a headache.
Why does it need to be tied down with the neutral wire
For grounding.
I live in an old house we get 110 volts in it. Some outlets ( mostly AC ) have two postive wires one right one left 220 volts compained. How does that work? Can someone explain that?
Alternating current (AC) is an electric current which periodically reverses direction
In north America 240V single phase is center tapped at the transformer outside your home.
You have split phase power in the panel with each leg having a potential of 120V referenced to ground.
My home has that and is only 20 years old. Often you'll find that in a kitchen where it's possible you'd run two high current devices at once. What bothers me is they're sharing one neutral, which is not fused (never should be) but could be carrying double safe current by acting as a shared return for the two phases.
looks like you've got two live lines in the socket (not one live and one neutral as it should be). Each phase is probably around 120V, so the inter-phase voltage will be around 210-220V.
You shouldn’t have 220 volts on any regular wall outlet. The receptacle should look different such as the one an electric dryer plugs into or be round with horizontal slots.
what is a ground fault though? how to test it
Push the test button on the ground fault
What happens with cordless tools?
Thats a completely different kind of electricity, DC instead of AC. The chances of being dangerously shocked by a cordless tool is minimal.
My home's energy plugs have no third wire besides hot and neutral. Is that really as dangerous as I fear? What should I do?
@@RobMrowiec Hey, thanks for your answer! I'm not in the United States (I'm form Brazil), and the electricians from here say it's "ok", but the fact that all appliances have a third plug that connects to nothing worries me a bit. At least my house is made of non flammable materials.
Thank you for taking the time to answer me!
If its your own house you can run the ground wire to all the sockets, run the common ground wire outside the house and bury it deep in the ground, for instance. But that's a big and costly job. If you live in a block of flats then you can't do anything about the wiring, but what you can do is ensure all your appliances that have metal casing don't have any loose / damaged wiring inside.
Also, some people take sockets apart and connect the socket's ground pin to neutral wire. Its not the greatest idea but better than nothing.
@@dmitrydmitry716 I’ve also seen grounds run to water supply pipes. Not sure that’s a great idea. But they definitely go to ground…well unless you catch rainwater or something …
@@michaelsmithers4900 These days water pipes are usually made of plastic so it may work only in the old building with metal piping. But I reckon, a person taking a bath while the ground fault occurs might not appreciate this sort of rigging.
@@dmitrydmitry716 Connecting ground to neutral is dangerous during neutral float. (cut neutral). All metal bodies will get energised. From India.
you could have explaned that current would not flow to the ground if we would not connet the neutral to the ground and that neutral and ground wire are """the same"""
i think its iportent to understand that there needs to be a potential differenz otherwise the currend would not flow
or in other words IF there is NO connecton between neutral and eath you would be able to toucht a bare kable and nothing would happen to you
Hi, great video but can you dumb this down even more?
So... if we jump start a car, how does electricity flow when the circuit isn't complete? (Car A positive, Car B Positive, Car B negative, Car A ground)
The simplest way I see it is that a circuit needs to be a full circle for electricity flow, and isn't that what we are trying to do when jump starting a car?
Unless it's like lightning and can go one way and then dissipate. Also, since cars are on rubber tires... how does the ground work? Does the metal body
provide resistance for the electricity to dissipate in case of a ground fault?
Positive to positive and negative to negative creates a circuit voltage that is the difference between the 2 batteries (so most likely 2v or less).
Positive to negative would create a circuit, but it would be a short circuit and the circuit voltage would be 24v+. This results in far higher current flows and will ultimately just drain the batteries.
It's essentially the difference between Series and Parallel for batteries, with the former being parallel and the latter being a circuit of batteries in series.
@@reider_mcfeely Thank you for the reply. So, does it have to be a "full circle" in order to be a circuit(have electricity flow) or can electricity flow with one end opened(not connected or ground)?
@@Riding_Seouless it has to be a full circle to have current flow (closed circuit). Otherwise, it's an open circuit and there will be no current flow.
@@Riding_Seouless with AC power, a connection to ground is still considered a closed circuit since alternating current just "vibrates" in place so that would be considered a closed circuit
@@reider_mcfeely Thanks!!!!
It is either you put a ground wire, or we put your cadaver to the ground
Lighting strikes man
In Europe it's called an Earth
Why dont modern electronic items such as Tv's , Macbook or smartphones dont have ground pin?
Double insulated products don't require a ground by law.
A phone or laptop operates on batteries and the transformer provides isolation from mains current.
Here in the UK class one appliances are earthed or grounded. That's cookers, kettles, irons, microwaves etc.
Class two appliances have a double layer of insulation so don't require grounding. Examples are hair dryers, radios, lamps, dvd players etc.
TVs can be class one or class two.
@@WillCamx The U.S. uses the exact same system (class 1 and 2 devices). Don't need ground pins on class 2 "double insulated" devices. Over here, the cords come with only 2 prongs on them, but in the UK they still come with 3 prongs (but the ground prong is a dummy prong).
@@JohnSmith-ys4nl UK outlets have shutters on the live and neutral terminals that only open when the earth pin is inserted. Stops people sticking things into sockets
@@WillCamx Yes. This became a law in the U.S. about a decade ago, but our shutters kind of suck. We need a redesign of our outlets, but they are too engrained now that it would be a massive chore.
I never used the ground wire
Hey please upload this in hindi version too
www.youtube.com/@EngineeringMindsetHindi
"Ideally... Will never be used"
That's not exactly true, during thunderstorms large metal objects like fridges and bridges get charged externally. In those cases the ground wire neutralizes the charge of the metal.
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I guess it depends on the context of the word ideal. The ground wire doesn't get used in contrived on paper ideal conditions, but it does get used in normal conditions several times a month. If you live near Lake Maracaibo, you'll be using it 160+ days of the year.
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This also explains why Japan doesn't put them on outlets as often. Their appliances are smaller, covered in plastic and they have less nosy children to poke at the outlets.
Not exactly. Current due to lighting is returned to it source via an Earthing rod , while current via circuit is returned to it's source via it's grounding wire. They are different sources
My fridge does not get externally charged and there are zero bridges connected to my house's electrical system. I know this because I live here and I have noticed no bridges and that unplugged fridges do not get static charges during thunderstorms. There are 8 billion people on the planet. Statistically, just about nobody lives by that lake you mentioned, they don't know anybody who lives by that lake, and couldn't find it without an internet search.
@@RobMrowiec So you're telling me that you don't live by that lake, didn't know anyone who does, and couldn't find it without an internet search? Thanks for confirming what I said.
Of course people live there, it's just not a statiscally significant number of people when discussing how residential electrical systems work or whether or not fridges get externally charged if there's a thunderstorm.
The outlet: ('o°)
Windows servers know, if a pc is grounded, or not.
Why use it? Because it’s code
Sorry but not very well explained what ground wire is actually doing
In a nutshell: it's main function is to trigger the circuit breaker, so that in case of ground fault the voltage is discontinued. Breaking the circuit, in two words.
Very confusing and unclear.
The safety is not the ground wire but the protective devices shutting off at fault (over current and/or residual current protection). But the ground wires make them work. Without ground wire the current will not flow back to the source in case of a fault. This is because the ground wires are connected to the neutral ONLY at main panel.
The biggest misconception is earthing/grounding. But this is a different story. Short: Earthing is to protect the electrical system agains high voltage surges. You have to understand very high voltage (electromagnetic fields of lightnings) at high frequencies for this.