Ground or earth is the reference point in an electrical circuit from which other voltages are measured, or is a common return path for electric current, or a direct physical connection to the Earth.

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How to size ECC cable [migrated]

For the line cables , I just check the maximum load current and select a cable from the manufacturer datasheet that can support that maximum current, What about ECC cable , how it is sized ? Regards
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How to calculate the earth fault current in a transmission system with no ground wire?

Background information, and my thought on the matter are provided in the end of the question. I need to calculate the fault current in case a fault occur for instance 10 km away from a transformer ...
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Hot & neutral have similar voltage to ground: Finding the problem Part 2

I accepted an answer to a similar question recently, but I now have additional information and have realized that I need a more specific answer. I am nearly certain that my landlord will be unhappy ...
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3answers
33 views

How to make multiple GND pours in Altium?

I have a PCB design that requires two ground pours on the bottom layer, one is AGND and the other is DGND. Most of the board is AGND ('L' shape) and the remaining should be DGND. I have tried to pour ...
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39 views

Is dual power supply's ground coupled?

I am using a dual power supply model CPX200 from TTI in my school lab, and I am trying use it to supply 1.8V and 3.3V to a PCB, so I figured it was a good idea to check whether the ground of the dual ...
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28 views

External whip 868MHz Antenna via coaxial cable. Ground Issues

I have a RF module that works at 868MHz.It works as transmitter and as receiver. (lambda:0.345m lambda/4=8.64cm). The RF module ground plane (GND_PCB) is 10x10cm, so bigger than lambda/4. By default, ...
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40 views

Oscilloscope builds charge on ground even when it is connected to mains ground

I have a following situation - my scope (UT4102C if that matters) builds some charge (quite painful to touch) on its ground (BNC connectors outer hull) even when it is connected via proper IEC cable ...
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29 views

How to connect ground from different type [closed]

I am currently designing a system where there are different kind of ground in it: "normal" power ground, analog ground, ground for sim card. How do you advice to connect all those ground on pcb ? I ...
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75 views

Are capacitors floating power supplies?

I'm struggling with the concept of floating voltages. For a grounded supply I can connect one side to an effectively infinite ground and get full power. It may vary depending on its construction, ...
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49 views

Practical differences between putting circuit complexity on the ground side vs the hot side

I'm wiring some computer fans behind the fridge in my camper-van to help increase ventilation. As part of this circuit, I have a temperature controlling microcontroller plus relay and a series of SPDT ...
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75 views

Ripple flowing through probes connected to the same point!

While trying to filter the ripple of my switching PSU, I've come to a phenomenon that is probably well known to professionals, but seems absurd to me. Admittedly, my scope is not of the highest ...
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61 views

I/O card couples analogue ground to 0V - how can I work around this?

I'm building a system that has to measure analogue voltages accurately. This system is being tested using PC-based test equipment that has an expansion card in it generating both digital and analogue ...
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53 views

How to detect pin state change in pulled up pins

I am working on Toradex module and developing a simple application where I am detecting the input and displaying it on UART. Now the application requirement is that we give 12v as input but the ...
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4answers
425 views

How does grounding the circuit provides safety?

I don't understand the concept of grounding a circuit for safety reasons, in this circuit that i simulated, imagine my hand touching the circuit as the closed switch. I am creating a closed loop ...
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1answer
52 views

Altium - How do I place my GND vias?

I have a 4 layer design, Top, layer2, layer3, bottom. Now I want to place GND vias on a ground polygon. Layers Top and Bottom both are a complete ground plane (Polygon) I was wondering; What is the ...
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338 views

what is a ground? [duplicate]

I have a basic question about electronic ground. For example, if electrons travel from the DC battery's negative terminal through the conductive wire to the positive terminal of a DC battery with a ...
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68 views

Cons or pros related to connecting analogue and digital grounds together using a ferrite or inductor

I'm designing a signal acquisition system with an ADC. I have these questions: 1- Any cons or pros related to connecting the analogue and digital planes using ferrites or inductors. Or should I just ...
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1answer
75 views

Is it good practice to couple the grounds of isolated supplies with capacitors

I once saw the following on an isolated dc/dc converter data sheet and have been doing it ever since with my dc/dc converters, but I wanted to ask to make sure it actually makes sense. Whenever I ...
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What do these dashed/dotted lines mean in this power cord schematic, and how should I ground this device?

--Edited at Sparky256's suggestion for better clarity-- Background Information I'm making a power cable for a piece of obscure, surplus military equipment (an AN/UGC-74B teletype, to be precise). I ...
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210 views

How does ground mains work?

When I studied how AC mains power works, I learned that one of the wires is connected to the ground or a body of water so that it can get back to the power station. The concept baffles me. Every ...
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39 views

External Power Supply Grounding Scheme

The following are two possible grounding schemes for a sensitive instrument that contains high gain analog circuits and potentially noisey digital circuits: This circuit is connected to an external ...
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1answer
123 views

Pulling the circuit's voltage to the ground with grounded probe

When measuring a point on an isolated circuit board with my grounded oscilloscope, I fear my oscilloscope ground will pull the measured point to ground level but this has never happened, I am always ...
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62 views

Return Path of Bypass Capacitor in a PCB with 2 Grounds

I have a PCB with two power rails, 5V and 12V, and two ground pours, GND-5V and GND-12V, respectively. The two ground pours are tied at one point (close to the connector). I'm powering a DAC off the ...
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How to stay well grounded?

After some read about ground plane breaks and inductor loops, now I am totally confused about how to design good PCBs. I made a small example of a two layer PCB. Blue is the big ground place. Red are ...
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71 views

Can some help me understand this ground switching circuit?

I am trying to understand a switch circuit related to a project that I am working on. Pin 1 - 12v signal for switch backlights Pin 2 - 12v signal for switch on/off indicators Pin 3/4 - Unused Pin ...
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71 views

How does Hybrid Ground Works?

The text that is above the figure is from my textbook and i am having difficulty to understand what it is trying to say because it's not in detail!! why only remove high frequency and prevent low ...
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30 views

Protecting GND from RS-232 voltages

I have a project that uses this two wire RS-232 trick: http://circuitcellar.com/cc-blog/one-wire-rs-232-half-duplex-ee-tip-135/ It combines RX/TX into one wire while the other is ground. However, ...
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Antistatic mat , how it works?

I have a large anti-static mat lying on the table of my workdesk, which looks like this. And it's connected to ground through the wall outlet from one point, meaning it's an open-loop: Let's say I ...
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128 views

Power cord without ground cable

Ground cable was ripped from the power cord of most expensive oscilloscope in the lab . Neutral and line cables are stil there . Do you think this is done on purpose ? if so , why ?
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69 views

Grounding dc project to clean RF noise

I'm doing a home automation arduino / RFID project and using a 12v DC switch mode power supply to power it. This supply will be plugged in to a wall outlet. The project however will have some ...
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ACPL-C79B problem

This is my first post on this forum. I have a problem with an isolation amplifier and i hope there's someone here who can help me out. Let me explain my situation. I use an ACPL-C79B from Avago to ...
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34 views

Floating Ground Adapter for Car audio line level signal?

I have a an Audi that uses the Bose external amplifier. Bose/Audi designed the system to use a single common between the head unit line out and the Bose amplifier line input, so it is four wires (FR+, ...
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82 views

What constitutes a “sufficient” ground?

Electricity novice here. Thanks for reading! I have a 3000 watt DC to AC inverter attached to a 12V battery bank. The inverter has "DC ground lug" on the exterior of the inverter's case which the ...
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98 views

GND in a DC circuit with circuit board

I wonder a question. Let's say I use a circuit board in a project (the left hand side on image below, not the Verabod), and I want to solder a circuit on it. For example, I want to use the circuit ...
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144 views

Difference Between - (Minus Sign) and Chassis Ground in Schematics

I was working on building some projects from the book Electronic Projects for Musicians and I noticed that in most of the schematics there are two symbols for what seems to be ground. One is a - ...
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55 views

Should vias really have bridges?

I have been always using bridges with vias. I gues that doesnt hurt but recently I though is it really necessary? I know that they're purpose is for the soldering process to be easier, otherwise ...
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56 views

Ground versus negative terminal in a data sheet

In the following datasheet. At some point it says : "If the option for synchronization is not used, the synchronization input has to be connected to ground (0 V) or the sensor must be operated via a ...
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45 views

Controlling multiple inputs without a common ground using semiconductors

I have a processor with GPIO outputs. It uses 3.3v logic outputs which share a common ground. (In particular, it has internal pull-up resistors, but I could turn on open collector mode) A device I ...
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78 views

Grounding options between three PCB's

I have a PCB (let's call it PCB #1) that has a Li-ion battery as its power source, sourcing 12V to 17V. The power from the battery is used to step down to 6V using a buck converter on PCB #1. A cable ...
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91 views

Oscilloscope ground oscillating [closed]

I turn on the oscilloscope, work a little, then I remove the cables and after a while when I want to use it again, I notice the ground has moved 0.4 or 0.6 V upper or lower than it was half an hour ...
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144 views

Wire the green ac earth wire in wooden chassis?

My own power supply is just about finished. Since i live in Europe the voltage here is 230v, from that it goes into my step down transformer that steps down the voltage to around 20 V AC and then into ...
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92 views

Using the neutral instead of the earth to supply electrons

I'm working on a VAN DE GRAAFF generator and I need to connect the bottom comb to the earth ground. But in my country we do not have a ground line . Can i use the neutral line instead and connect the ...
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36 views

Why do IC's have so many grounds? [duplicate]

Is there a technical reason why the multiple ground pins aren't tied together internally? I can't see any real reason as they all get connected in the same way.
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ADC EVAL_AD7984_PMDZ voltage source and signal source sharing common ground

EDIT: (problem definition shortened into 2 sentences) For anyone using EVAL_AD7984_PMDZ and having troubles to apply -2.5, 0, 7.5 [V] and signal to differential probes, because the voltage source and ...
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1answer
47 views

Connecting Ground Paths of Low-Current and High-Current Circuits

A small (3.3V/10mA) uC circuit requires a ground. I designed the circuit’s PCB to use a nearby ground wire that is attached to the car’s frame in at least two places and used by the 2A windshield ...
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1answer
36 views

Common Ground to Earth?

I am looking into building this stereo amplifier based on this circuit: 2 x 22 Amplifier However, as I am pretty new to circuit building, I have a question about the ground lines: Do i tie all of the ...
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85 views

Is it okay to use a screw and a nut to connect minus wires from parallel circuits?

I want to connect several 12 Volt sockets in parallel. On the positive side the wires are connected to a fuse box which is connected to the positive pole of a 12 Volt lead battery. How do I connect ...
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50 views

How to connect 2 different power supplies together

I have a power supply that provide the following outputs (+&-15V) & (+&-10V) sadly this power supply is obsolete so I have to get those voltages from two separate power supplies one that ...
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55 views

Is it possible for lightning strike to travel up ground / earth pin on a mains outlet?

I live in a country that follows the UK mains specification, where there are 3 pins on a wall outlet with the topmost pin being earth/ground. Now, is it possible that during a lightning strike, extra ...
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43 views

ATX PSU 3.3V output dead short with ground

On an ATX PSU, 3.3V output was dead short with ground (checked with DMM),once i powered ON the PSU 3.3V output was providing the rated output (3.3V) how this is possible?