Questions tagged [grounding]

Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.

Filter by
Sorted by
Tagged with
1
vote
1answer
122 views

“Creating” a ground pin for my laptop

I am building a sensor using an Arduino connected to a laptop; I noticed that the readout is much more noisy when I use a non-grounded laptop (either running on battery or connected to a power socket ...
0
votes
0answers
21 views

Connecting to motor controller input ground drops system voltage

I am currently working on installing photoelectric sensors into motor controller inputs. The inputs to the motor controller are 24V open ended inputs. The supply source is a 48/24 V buck chopper. When ...
0
votes
1answer
31 views

PoE Design for Camera Interface Isolation Question

We are designing a PoE design to power our camera. The block diagram below is the basic design we are planning to implement. I want to get some advice to make sure we will not be damaging our camera ...
0
votes
1answer
63 views

Grounding a server rack to grounding rod with no ground wire in outlets

I have a house built in 1947. There is only Live and Neutral wires in the walls. I CANNOT AFFORD A HOUSE REWIRE! I do have GFCI outlets installed where needed. I have a Server Rack that has a ground ...
6
votes
1answer
7k views

Why is neutral wire connected to ground at the transformer?

I understand the use of ground wire at the home appliances but why is the neutral wire connected to ground at the transformer? Why doesn't the neutral wire go back to the power generation plants. I ...
0
votes
1answer
69 views

RFID reader sensitivity/read range - How does a “hard” ground increase sensitivity/read range?

I'm working with two RFID readers in my circuit and an arduino to control both of them. The whole thing is powered by a very cheap wall-wart Power supply at 12V which is rather noisy to begin with. ...
0
votes
1answer
50 views

Stray voltage on ATX MB ground [closed]

I have recently observed a strange thing. On my server (repurposed desktop motherboard + PSU + 2xHDD), as I was wiring it, I touched one of the connector casings. You know the ones on back, of which ...
5
votes
1answer
90 views

Can somebody please explain to me the principle of a T-T Earthing system?

How are the transformer, consumer's side and the generator earthed in a T-T Earthing system? I seem to understand that the generator and its frame should be earthed separately; The neutral of the ...
0
votes
1answer
861 views

Float Function generator

Why are the Outputs of many function generators earth grounded? As far as I understand grounding the generator or Parts like the chassis can reduce shock hazards if something fails within the ...
3
votes
1answer
83 views

What to do with ground wire?

I have a few I/p transducers(which work on 4-20mA loop current) and I have made a single cable for all of them, they each have posititive, negative and Ground wires. The controller I have for these I/...
0
votes
0answers
33 views

Differential input pH schematic reading

I am trying to understand the following schematic for a differential input pH probe. here is the link A1 and A2 role are unity gain opamp amplifying high impedance probe signal, while A3 makes the ...
6
votes
3answers
2k views

RF Ground Stitching in Proteus Ares 8

I am using Proteus Ares 8 to create a PCB for a simple RF circuit. I have a double sided copper board, filled with groundplane on both sides, with a single 50 Ohm microstripline across the board to ...
0
votes
1answer
89 views

Earth& neutral voltage detection

Can someone suggest me circuit to detect the earth to neutral voltage. I would like to trip relay coil using microcontroller if earth to neutral voltage exceeds 3v. There are device RCB and RCBO ...
0
votes
2answers
95 views

does the 24 Vdc supplied circuits with metal chassis needs to be grounded to earth?

I used put some electronic circuits together in a plastic box, with a DC power jack attached to the box for a 24V dc supply to my circuit. Everything works fine. However i now plan to put all the ...
1
vote
1answer
53 views

Do all common grounds end up to the chassis ground?

I'm new to electronics, and still wrapping my head around "common" and "ground." The schematic is: My question is if ALL the solid black grounds/commons end up at the one going to the cap/resister ...
1
vote
1answer
317 views

Proper Chassis Grounding

I'm starting to design things that run off mains voltage and I want to be sure that I have a proper connection from my chassis to earth ground. I've been reading a bit about proper grounding and have ...
2
votes
3answers
592 views

Is a separate safety earth connection necessary when using an earthed power entry module?

Testing the Schaffner FN1394-10-05-11 power entry module with a multimeter shows continuity between the ground pin and the body of the module. Consequently, when the module is fitted into an aluminum ...
0
votes
1answer
56 views

fault current through a person

Say a person touches the live wire as shown in the first attachment, the current will flow through him and dissipates into the ground as shown in the second attachment right? the fault current through ...
0
votes
1answer
61 views

Grounding considering signal return path

I wanted to ask if there is a difference between 2 scenarios on the illustration i've included. If we have 2 or more boards interfacing with each other should we connect every output with it's own ...
1
vote
3answers
5k views

Will standing on a non-conductive surface with wet feet prevent grounding and therefore electrocution?

It is a well known fact that one should not handle electrical equipment in general and electrical home appliances in particular when barefoot, or when one's feet are wet (even when wearing flip-flops/...
0
votes
2answers
69 views

Is a ground plane meaningful even where the signal return path is not through ground?

I'm designing a two layer PCB for a keyboard where most of the board space is taken up by the key switches and backlight LEDs. The switches have a traditional switch matrix configuration with diodes ...
1
vote
5answers
4k views

grounding, whats its purpose?

Some say Ground is just a reference point for measuring voltages, some say ground is a safety device for appliances and some say ground is just a bare piece of metal regardless if its even connected ...
1
vote
2answers
76 views

Why there is a grounding on device with two prong cord?

I am curious why there is the grounding on a device with two prong cord? As far as I know there should be 3 prong cord to make the grounding working.
0
votes
3answers
940 views

LM386 amplifier buzz when not connected to signal

I've set up a simple LM386 amplifier on a breadboard according to the above schematic. When connected, the amplifier works like a charm driving a spare 8Ω speaker with impressively low (audible) noise....
0
votes
1answer
145 views

Ground loop current for voltmeter

I am trying to build a voltmeter, but the voltmeter is powered by a 12V dc adapter. My concern is if the ground potentials between the analog input source and the voltmeter are different (e.g. due to ...
4
votes
1answer
79 views

Why are overhead electric wires allowed to have higher voltages than third rails for rapid transit railways?

I hope this question is on-topic for this site. The city I live in (Chennai, in India) got a rapid transit metro rail a few years ago that uses overhead electrification of 25kV, 50Hz AC voltage to ...
0
votes
2answers
69 views

Why do stoves need not be connected under the earth leakage?

On some stoves I've seen stickers stating that the stove doesn't need to be connected under the earth leakage... Which is rather confusing since we need to earth it in case of earth faults. I'm just ...
2
votes
2answers
54 views

Earth continuity of slot together aluminium enclosure

If I were to use a slot together aluminum enclosure for a mains powered device, and I earthed one panel of the enclosure by fitting a stud, how could I ensure continuity of the earth to the whole ...
0
votes
1answer
73 views

Will leaving 1 of the 3 GND pins on the ATMEGA328p ungrounded cause any problems?

I am creating a circuit using an ATMEGA328P and i am unable to ground one of the 3 ground pins (other 2 are fine) due to limitations of my design. I have tested the IC with a multimeter and the pin ...
2
votes
1answer
64 views

Should isolated GND be tied to logic GND to prevent ground drift?

In an industrial environment, let's say you have an isolated interface that connects to an external sensor or device. This interface separates both logic signals to your main board as well as GND and ...
3
votes
5answers
95 views

Open circuit ground multiplexing?

I am experimenting with electrospray ionization. The setup has a 4kV power supply connected to an electrode that is separated from a return lug (or ground plate) via an air gap, followed by an inline ...
0
votes
2answers
50 views

How to connect the GND with the metal case of the robot

I have a PCB design inside a metal case of the robot. The robot is mobile, it moves on wheels. The problem is how to connect the GND with the metal case of the robot. Direct connection is not safe, ...
0
votes
0answers
23 views

How to ground a codec (TLV320AIC3105)

I'm trying to design a board with an audio codec. All signal connections seem to be pretty straightforward, but I have a major trouble with ground. I belive there are at least 3 contradicting ...
42
votes
10answers
26k views

Why is an Ethernet cable not grounded?

There is no dedicated GND in the classical Ethernet 8P8C ("RJ45") pinout.[1] Why does the Ethernet spec not include a ground, unlike many other cable types used for interconnecting devices that may ...
0
votes
3answers
5k views

Kirchhoff's Current Law at the ground node?

Can one do KCL at the ground node? Does any current go into the ground? I think not, but I am not sure. Bonus Question: If yes, then how does grounding buildings drain the current into the Earth?
0
votes
2answers
317 views

Chassis grounding for multiple daisy-chained units

I'm designing a system that provides power/ethernet/serial for up to 5 daisychained units. All of the boxes will be metal and my initial plan is to run power and signal ground through the 14 pin ...
0
votes
2answers
41 views

Pulsed DC current measurement using arduino and shunt resistor

I am currently working on a project ( to develop a constant current pulsed DC supply) in which current has to be measured using Arduino's analog input (Upto 20A) passing through a variable resistance ...
0
votes
0answers
42 views

between earth and ground

In my 100 Watt ACI Drive circuit, I've confusion about which components will be best to connect between DC_Bus Ground & Earth? FYI: 300 VDC for Motor & 15 VDC for Logics & other ...
1
vote
2answers
42 views

Connect MIDI input shield connection to ground with capacitor. What voltage / kind?

The midi specification mentions optional capacitors between connector shield and ground for a midi input: Neither the type of capacitor nor the voltage rating is specified. I would think that the ...
1
vote
1answer
49 views

What grounding should I use for this capacitively coupled input?

I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this: In this case the ...
0
votes
1answer
62 views

PCB Ground Plane and Redundant Connections to Common Ground

This is a question borne of sheer ignorance, but I'm not sure if it's a good or bad thing. I'm designing a PCB (1) that will connect to another PCB (2). The latter has all of the power, ground, IO ...
1
vote
1answer
29 views

Common ground b/w power supplies and analog pin for microcontroller

Referring to the schematic below, is it best practice to have the 5 V supply on the right powering the MC (arduino-esque microcontroller) share a common ground with the 24 V supply ? The 24 V supply ...
0
votes
1answer
63 views

Floating neutral in TN-S or TN-C-S earthing system

Since neutral is bonded to ground at building distribution point in a TN-S or TN-C-S earthing system, could floating neutral happen under the following conditions: Loss of N and/or PE at transformer ...
1
vote
2answers
145 views

Separate grounding for analog and digital portions of circuitry

A datasheet suggests separate grounding for analog and digital portions of circuitry (http://www.ti.com/lit/ds/symlink/am26c32.pdf#page=12). Is this to say that the IC's outputs should have a ...
0
votes
1answer
31 views

Grounding GPIO pins during 8051 programming

I'm trying to make a programmer for the 8051 microcontroller IC's, specifically the AT89C2051. I saw a circuit online (the blowit programmer) in which the unused GPIO pins are left floating. When the ...
3
votes
1answer
118 views

Difference in current transformers conection for ground fault detection

I have seen that for detecting ground faults on a 3-phase system powered by a secondary wye connected transformer, current transformers (CTs) can be connected in several ways: On the ground ...
1
vote
2answers
118 views

Grounding of IT equipment for office ESD protection

We've been having a lot of problems in my office with ESD. People touch cubicle frames and monitors shut off momentarily, painful shocks through laptops, etc. I'm worried about equipment getting ...
0
votes
1answer
134 views

Crossing ground planes with low current low frequency signals

I have a board which has two ground planes, analog and digital, that on this board are completely separate. The grounds connect on another board, which is connected via a flat cable. All signals on ...
4
votes
5answers
589 views

How can I get ground from a NEMA 5-15R wall socket without electricity?

I have some network equipment that I want to connect to ground (they come with 2-prong wall wart PSUs and have a separate screw hole for a grounding pigtail) - but where would I get ground from in a ...
0
votes
1answer
49 views

Should I tie my various DC power supply 0 V rails to ground?

I'm putting together the controls for a CNC router table I'm building. In the enclosure I've got some DIN rail power supplies, contactors, and terminal blocks. Also in the enclosure is the VFD for ...