Grounding Definition and 131 Threads

I have two identical DC systems fed from separate DC/DC isolating converters, one converter is fed from a negatively earthed DC supply and the second is fed from a floating DC supply. In both cases the negative of the DC/DC converter supply is tied externally to the 0V or 'common' of the output...

Hello. The ground plane is sometimes used as current return path. If current is low frequency and amplitude is small then voltage rising due to current flow can be ignorable. However, what is return current is actually very high in both frequency and amplitude? In our lab, gas discharge...

Hi guys, I know this sounds crazy but I do not understand why household circuits are grounded. It is this grounding that causes more harm than good in my opinion. I understand the need for it, e.g. if your washing machine's hot wire shakes loose and contacts the housing and it weren't...

Hello. I've uploaded similar question before but I think it is time to make this clear. I've seen the attached one during reading of grounding. In the picture, the body of the power line filter (or ground of the filter) is connected to inner surface of Faraday cage and signal ground is...

I was recently asked to help with some A/V stuff at my church. The goal was simple: Display HDMI video from a laptop to two LCD TVs. Since distance was an issue, I purchased an active HDMI-to-Ethernet converter. I've included a diagram for reference. When I went to plug the 3' HDMI cable...

Hello. Let's say there is a instrument needed to be EM wave-shielded in High voltage discharge lab. Building Faraday cage becomes necessary and the instrument is moved to inside the cage. The cage is grounded to lab ground and the frame ground of the instrument (it is also signal ground for the...

I moved to Australia from the US and took my Crate amp and Ibanez electric guitar with me. To deal with the 240 VAC, I needed a step-down transformer. So I have this setup: The ground connector of the socket on the 120 VAC side got weak and stopped making connection (Note 1). So the guitar...

Just curious about why grounding transformers are used with a delta secondary . What would happen if I connect a phase to ground load to the secondary of a star delta transformer without adding a grounding transformer?

Hello everyone, So some background on what I am doing. We have a pelican case with a bunch of PCBs that require DC voltage. I have purchased these power supplies (http://www.meanwell.com/search/EPS-65/EPS-65-spec.pdf ) to do the AC to DC conversion. They are located inside the Pelican case as...

Hello my name is Mike Moore and I work for Copperhead Industries, LLC We are a tracer wire manufacture for the underground non-metallic pipe utility sector, natural gas, water, sewer and telecom. We use magnesium anodes for grounding out the far end of the tracer wire system which completes...

I have an issue that appears to be relating to noise mitigation and grounding. Some background on myself is I have a mechanical engineering technology degree. But my job requires an ability to work with and troubleshoot electrical issues. Currently a customer is using a Servo motor on an end...

Is it possible to sufficiently ground yourself just by touching the negative lead of a wire coming from a power supply once?

On which standard IEEE / IEC BS EN / NEC...we can find recommendation on combining Grounding Networks of LV and MV/HV together?

Dear All here we have two examples of Generator Nuteral Grounding my question about Earth switch closing Example -1 if three generators are in operation and one earthing switch is closed, can we close generator-2 or generator-3 earthing switch closed at a time of parallel operation? yes...

Assuming a 2 pin connector for an SMPS power supply, what is the role of the R and C that are connected to Case ground. Usually R is in Megaohms and C around 0.1uF,2KV. IS there a risk of shock when the case is touched?

Hi, I've often wondered: If you connect a negatively charged piece of metal to the earth, the electrons flow to the ground so the metal becomes neutrolized, but what is in in the ground that the electrons flow to? Is it the dirt or the water under the ground? How could dirt particles absorb...

When households are said to be grounded using an Earth wire, electrons are supposed to flow to the ground because the ground is at zero volts. For example, if your the live wire touches the metal casing of your toaster then the Earth wire takes the current to ground. But isn't a lot of household...

what will happen if I ground my 12v(low voltage system) and 144v(high voltage system) to a common ground?

Homework Statement Basically construct the circuit on a breadboard and take some measurements: http://ithaki.eng.auth.gr/aetos/elab/image.php?x=44 Homework Equations - The Attempt at a Solution - My only question is how am I supposed to do the GND grounding that it wants? o.O

I observed the following configuration in a factory: Power supply from a generator (400 V line-to-line) is stepped up to 11 KV (line-to-line), which is then fed to another transformer that produces a stepped-down, 2-phase output. The step-down transformer has 3 input terminals. Step-up...

What are the pros/cons of high resistance grounding versus solid grounding and low resistance grounding? What is the preference for different applications? What complications does high resistance grounding introduce in drive system applications? Thank you.

Can you claim to have ESD protection if you have just the wrist strap connected to ground and not the ESD mats on a typical workbench? With just the wrist strap, ESD is instantly discharged to ground. With the ESD mat, the charge is gradually discharged to ground.

I am looking to use a PVC pump to push a flammable, explosive gas of minimal gage pressure (3 mbar) between two rooms. I chose PVC because it is non sparking, but I am concerned about static electricity build up. The pump will be used for 10 minutes at a time in a portable application, I am...

Can the point to point test, (to determine the resistance between the main grounding system and all the major electrical frames, system neutral, etc) be made with an ordinary multimeter or does it need a special ground test tool? The NETA value of 0.5 ohm is widely accepted?

Why does node analysis have a ground node?

Hello everyone. I'm very...very new to electronics, and am looking to get into the 'maker' world, of building small electronics, and projects. One concept though that has bothered me is the concept of grounding. Now I've come to understand that ground wires in homes have that bottom plug...

hi all dear members… this summer i have a final year project to graduate as an electrical engineer … my topic is to design and implement a simulator of a protective grounding system that contains the 3 types of circuits … that it : TT, IT, and TNC(s) … and adding the adequate protective circuit...

I asked the question during a grounding seminar ...talking about grounding in USA residential homes with 240/120 panel. I wasn't quite satisfied with the answer. The question is...what dangers are introduced when you remove the ground rod from a service entrance like the main panel in a...

Hello everyone! There is something about grounding in AC systems that has been bothering me for a while. I have read almost all of the threads about grounding here, but I haven't found my specific question on any of them. In my house, there are 3 wires that come from my outlet, the hot...

Hi, I'd like to do a simple experiment to see how grounding influences the EMF generated by an appliance. I'm a novice at these sorts of things though, and I want to be sure that there aren't any safety concerns which I'm not aware of. In order to do my experiment, I would modify a 3 pronged...

There are many documents available about PCB/component level ESD protection, but I have found only few about how to get the charge out of the PCB and into earth. Setup - plastic enclosure with metal base plate - enclosure contains 2 devices: plastic power supply (smps) and controller pcb...

Can we Earth ground AC and DC voltage? would this effect the components on the system?

Hello Everyone, I have a 5 ampere weighing equipment & need it to ground properly. It is about 80 feet away from soil point. (Direct wire to the equipment will be used & long term connection is required). Manufacturer says that: "There must be a good third wire ground, preferably to a...

Hi all, I was reading an article that talked about grounding electrodes. It noted that for these electrodes to be efficient, it was necessary to put them at least 8 ft into the ground. My question is then: does the Earth act as a conductor below that 8 ft threshold? I looked around and...

Hello experts. This is a unusual behaviour. I moved to new house, an apartment newly constructed less than a year old. I first noticed shock when I was disammbling my computer , i immediately took out multimeter and tester. First checked with tester, it did not show any symptoms of...

I have a question about grounding/earthing. People are grounding themselves because EMF's of electrical appliances are adding a voltage difference to us and the earth. When someone grounds himself, the voltage difference immediately goes to zero. Electrons will flow to the body and these are...

When there are multiple electronics sub-system interconnected, I have seen some applications where one of the sub-systems will include a current limiting resistor as well as some EMC related components at its ground input to protect itself. The case being that this device is on a vehicle...

When I ground something, how does the electrons actually flow into the earth? Since it is not a complete circuit whereby electrons flow back into the battery such as in cases like a battery connected to a bulb. I always thought a complete circuit was required so how can the electrons "choose" to...

I have seen that in some circuits there's grounding...I know that earthing is for keep a part of a circuit in a zero potential...Don't know why it's done...Here's some circuit's..Tell me why it's been earthed..

I'm an EE student freshman yr. I don't quite understand grounding in circuits. Can someone explain it to me? I have a general idea but sometimes I just get lost. Even in AC, when you can plug a cord in with just hot and neutral and it would work but 3 prong plugs have a ground... is that...

What is the purpose of the grounding terminal in the plugs of some electrical appliances? Is it designed to act as an arrestor for unwanted electrical charge coming from lightning, static electricity, power fluctuations, and electrical arcs, sending the excess current to a grounding wire...

Let's saying you're working with something that has electricity running through it. If you ground yourself by touch something metal, aren't you making it easier for charge to flow through you through the metal, so a greater charge would flow through you? And if you didn't touch something metal...

I feel as if the difference between grounding in a circuit and grounding in mains power is not very clear. So my questions are, what does a ground do in circuits and is it necessary?

In a very good book, Chabay and Sherwood explain that when an initially uncharged person touches a negatively charged metal object, free electrons from the metal neutralize some Na+ ions in the salty layer on the person's skin. The person then becomes negatively charged and the neutral Na atoms...

Good day to all, I'm a newbie to the site and I have a quick question for all you electrical geniuses out there. I will start of with a bit of insight into my question. I am a maintenance Controls Technician in the automotive industry who has some experience, in my earlier years, doing...

Every circuits needs to be grounded in order for it to work, but when do we need to take into consideration on earthing it, and what is the difference?

I have a system with an electrical source in the centre. the circuit branches off to two sides, one side is grounded, the other is not, if I were to touch the not grounded side of this wire, would I receive a shock? Or would I be perfectly fine because it's grounded at the other end?

In building a crystal radio one thing that comes up everywhere I look is the phrase. "A good ground is as important as a good antenna". So you have your circuit. Capacitor, Inductor, diode, resistor and headphones in series. Have a long wire just hanging from one place as a long wire...

Sorry for jumping through topics, I just have an electronics test tomorrow and I want to see I fully understand grounding points. Homework Statement So I made up this circuit and found its voltage drop at every point http://img137.imageshack.us/img137/3352/volts1.jpg Now if I set Vab = 0...

In the circuit I accidentally connected output of the amplifier to the ground. Could it damage my chips? All components of the circuit are already on the PCB, amplifiers are powered from 3V and -3V batteries. My top layer is grounded and there is a possibility that soldering the chip we...