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Questions tagged [grounding]

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

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How to connect a lamp with uncoded wires without causing a dangerous situation (improve understanding of earthing) [migrated]

I uninstalled a lamp in my grandparents house and it has three wires, two of which are connected to the same terminal (see image below). The lamp was functional and I'm wondering how that worked. ...
Alon's user avatar
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3 votes
2 answers
391 views

Digital-to-analog-converter PCB: Ground plane cut or not?

I'm designing a DAC board and I'm not sure what would be the best thing to do regarding grounding, to minimize noise. This is the approximate layout I have so far, with the system ground point (also ...
blockworker's user avatar
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52 views

Acceptable resistance between hot (mains) and ground (earth)?

A DIY project I'm working on uses electronics embedded in concrete, including 110V AC heating elements. As I was verifying my wiring before testing the device I was surprised to discover conductivity ...
sirbrialliance's user avatar
2 votes
1 answer
102 views

Telecom Lines Conducted emissions noise travel

I am seeking an explanation of how conducted emissions on telecom lines are measured. The frequencies of interest are at 150kHz to roughly 850kHz. The size of the unit is 30cm by 30cm by 15cm. The ...
DRF's user avatar
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Ground connection of power converter and MCU

I've designed an AC/DC power converter PCB, with input, and output voltage sensing, but I have problem connecting it to microcontroller board, i'm using F28379D launchpad as the microcontroller. I ...
Saif 's user avatar
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2 answers
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Connecting Two 24VDC Power Supplies

I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
Dylan Mc Loughlin's user avatar
5 votes
1 answer
217 views

Metal chassis grounding with wall wart supply, ESD test failed

We're building a device which takes its input power from a 12VDC wall wart PSU, and has a metal chassis. We just passed preliminary EMC/EMI test, but in the ESD test an 8kV jolt to the chassis killed ...
Timo's user avatar
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Circuit works only when oscilloscope probe is connected and does not work otherwise

I have built the circuit shown below. The problem is that the circuit only works when I connect oscilloscope probes between node-A and the ground. If I remove or decouple the probe-ground from the ...
UTs's user avatar
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Audio project converting TSH-4 headset to 3.5 mm audio jack

I've been trying to connect this TSH4 headset to a 3.5 mm audio jack. The headset has kind of a weird setup, with Mono audio + and - being the top pins (I don't know which is which, but the polarity ...
Emily Kramer's user avatar
2 votes
0 answers
33 views

Telecom Lines Conducted emissions [closed]

We have rented a Telecom line ISN to conduct some in-house pre-compliance testing. The test setup closely follows the CISPR32 standard. We encountered issues with conducted emissions in the lab, which ...
DRF's user avatar
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EMI/EMC: Connecting PCB mounting holes to chassis in multi-board system

I am working on a system which has a metal chassis connected to the earth. The system gets power from a dedicated PSU. The power lines of the PSU (VCC_PSU / GND_PSU) are fed into a master PCB and ...
SpongeBob's user avatar
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2 answers
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Dedicated ground vs power cord ground?

So my Siglent 1104X-E oscilloscope has no dedicated ground- it uses the power cord's ground. My Siglent function generator has a dedicated ground (screw terminal with banana plug option). Obviously I ...
Rahman's user avatar
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1 vote
4 answers
72 views

Can differential probes be used with floating oscilloscopes, such as handheld/tablet scopes?

I am in the market for a differential probe (and possibly a handheld oscilloscope down the track for field work). One seller I came across has a warning for many of the probes that they sell saying &...
daviegravee's user avatar
3 votes
2 answers
104 views

My isolation transformer has its protective earth connected to the output neutral. How should I rewire it for my home lab for "DUT probing"?

I have a rather sturdy isolation transformer in my home lab and I just realized that the primary side earth is not only connected to the output side earth but also to the output side neutral. I don't ...
pipe's user avatar
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5 answers
2k views

Why does power supply have a negative rail if can only output positive voltage?

According to the datasheet of this power supply, the output voltage goes from 0~60 VDC. If the output can't be negative, why does it have a negative rail beside ground? Why not just have ground? In a ...
ludicrous's user avatar
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CAN BUS Chassis Grounding

Hoping to get get some guidance on correct grounding for a CAN Bus I have designed. The following diagram gives a high level overview of the system connectivity: Some notes on the setup: There are a ...
gid204's user avatar
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1 answer
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Earth protection in PV + battery system

I'm building a system that looks like this: PV -> solar charger (48 V) -> batteries (48 V) -> isolated DC/DC (48 V->12 V) -> non isolated DC/DC (12 V->3 V) -> load The PV's are on ...
user362085's user avatar
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79 views

Why did my microcontroller emit smoke?

My setup is as follows: I have an RGB LED driver board powered by a 24V SMPS. The microcontroller, an ESP32, is connected to the driver board by RGBW PWM lines and a ground line. The ESP32 is also ...
flimsy's user avatar
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1 vote
1 answer
40 views

Problem: Transient Voltages in Grounding Circuit Cause comms loss

I am working with a Hipot unit to break down a DUT. The Hipot is powered by an independent 220V Ckt. In my test setup I have a PC and another unit, both of these are powered from separate 120V ...
Juan Antonio's user avatar
4 votes
2 answers
497 views

PCB layout for crystal of MSP430FR6047

I want to design a layout for MSP430FR6047 and I was reviewing a reference design form TI for MSP430FR6047 Evaluation board, then I noticed the are 4 different GNDs as follows: (USSXTAL_GND, ...
Andromeda's user avatar
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1 answer
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Grounding Lug Straight To Chassis

Connecting some thicker gauge cable to my trailer to ground neutral for the 12v DC system. The current 8AWG wire uses a receptacle style lug where the wires are inserted and the that receptacle is ...
jhickok's user avatar
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0 votes
1 answer
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How to Ground a Photodiode and TIA combination

I have a TIA circuit as below, In simple terms the Photo diode is a APD C30955EH and Circuit is supposed to work up to 100Khz signals digitalization. The supply which is powering the circuit is a ...
kakeh's user avatar
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Questions regarding TVS-diodes and grounding

I am currently working with solutions to pass the ESD-requirements for EMC. I have used TVS (ESD)-diodes in the past to good result, but never really understood exactly why they work. Sadly, this is ...
sternis1's user avatar
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Substation supplies with touching MSBs

On this site we have the below setup: We have 3 x main switchboards fed via 3 x separate transformers that are existing, this existing MSB has a connecting earth bar only and no neutral connecting bar ...
user373150's user avatar
0 votes
1 answer
38 views

Can a ground connection for a 230VAC device go to a 0V of a 24VDC circuit?

So, here is the situation: We are designing a small oven made out of aluminum. For it we plan to use a power adapter from 230VAC to 24VDC. The problem is that the temperature controller we have ...
lexax127's user avatar
0 votes
2 answers
110 views

Are common mode chokes really needed for Conducted Emission standards when there are only two terminals?

Common mode chokes make sense for power inputs when there are three terminals: power line, power return line and an "earth ground". You measure the noise of power line with reference to ...
aaroniero's user avatar
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56 views

TN-S Earthing System

I wanted to give a good explanation about the installation that i have to examine. I want to explain that it has a TN-S earthing system. I have conducted several measurements, and they yielded a loop ...
KrokanteKorneel's user avatar
1 vote
0 answers
50 views

Broken ground conductor in single wire earth return (SWER) system

I have a property in a rural area that is serviced by a SWER line. This means we get one high voltage line from the utility into the service transformer, whose other leg is connected directly to ...
Délisson Junio's user avatar
-1 votes
1 answer
64 views

Could an insulator-covered copper plate be used as ground instead of grounding rod(s) buried in the ground?

Sometimes there are situations where I need to ground a device plugged into 220V/50hz AC but the plug is ungrounded. An example is using a generator that has a grounding rod but no place to stub it ...
Dimitrios Desyllas's user avatar
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Problem with circuit--ESP showing invalid packet header on powering the robot on by battery

I am trying to build a self-balancing robot, the circuit of which I have attached here. Now I am facing an issue, which is when I power the ESP via the 5V buck convertor output, the ESP gets corrupted ...
Shivansh Chaudhary's user avatar
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0 answers
60 views

Can I connect 0V between 2x 24V Power supply in different devices?

Devices: Robot (24VDC 10A power source, used for an IPC, sensors, electronic boards, CAN communication, DI/DO etc) Mini automation (24VDC 10A power source but different brand, used for a mini Siemens ...
Sebastian's user avatar
2 votes
1 answer
67 views

Cable shield connection to metal enclosure on rolling stock

It's standard practice to ground cable shields at both ends to prevent EMC issues. I am uncertain if this practice applies to enclosures installed on train roofs. In my setup, I have an I/O cable ...
M.A.T's user avatar
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2 votes
3 answers
380 views

Safely grounding 120V AC device

I'm pretty new to electronics. I'm building a device that has an aluminum enclosure, is powered by a 120V AC outlet, and requires roughly 520W of total power. My circuit is: AC input with a hot, ...
Sohil Sathe's user avatar
1 vote
2 answers
138 views

Bare copper wire wrapped around grounding rod

I will soon have a 5/8'' copper bond ground rod installed by an electrician and while discussing the materials needed and the entire process, I was told he'll attach/wrap 16mm2 bare copper wire around ...
chomba's user avatar
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3 votes
2 answers
324 views

Dirty VS clean ground: How to tie grounds?

I am trying to understand when grounds can be connected together and when they should not be. So far, I have learned the following: Clean grounds should be connected together, as should dirty grounds....
chami's user avatar
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1 vote
1 answer
54 views

How does a socket grounding tester work?

I'm curious about how socket grounding testers like these work: https://www.amazon.com/Amprobe-ST-102B-Socket-Tester-GFCI/dp/B008E07HM2/. I'm also curious about what kind of false positives they could ...
Jasper Siepkes's user avatar
0 votes
1 answer
62 views

Earthing connections in cascaded UK mains power supply

I've just looked at a power supply for a client to try and diagnose some other issues, and I noted that the connections weren't what I expected. The supply is cascaded, one isolated UK mains to LV DC ...
LordTeddy's user avatar
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0 votes
1 answer
53 views

Grounding of battery-powered devices

I have a device that I am prototyping that can be powered from either 5V USB power (via a Mini-B connector) or batteries (combined 6V). Power from either of the two is switched with a SP3T switch, ...
lemon's user avatar
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1 vote
1 answer
208 views

Should this Chinese power supply be earthed?

I recently bought a piece of equipment from China, and it came with a laptop-style power supply. I immediately opened the supply to check if it was electrically safe, because we all know how lax the ...
Sod Almighty's user avatar
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2 votes
3 answers
439 views

Should unused connector terminals be connected to ground?

I am using both male and female D-SUB connectors and about half their terminals are currently unassigned, unused and unterminated. They are not the crimpable versions, all the conductive terminals are ...
Tommy95's user avatar
  • 179
5 votes
1 answer
360 views

Bidirectional TVS between field ground and analog ground

I'd like to know why this circuit has a TVS diode between both grounds. The field ground is the physical ground used in the circuit and the analog ground is used for 6 analog signals (between 4 and ...
Jjeico's user avatar
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4 votes
2 answers
535 views

Grounding ESD Table

I work in a manufacturing plant and we are setting up new ESD benches. Essentially, the table is grounded to the ceiling of the building and then multiple work benches are connected to that bench with ...
MDD's user avatar
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1 vote
3 answers
185 views

How do people ground cable shield on thermocouple cable?

I am building an electronic controller that measures the temperature on a metal chamber. Type K thermocouple sensors are placed on the metal chamber, and type k thermocouple extension cable connects ...
Open_Hamster3337's user avatar
2 votes
1 answer
58 views

Managing Ground Return for High Surge Currents in LED Capacitor Discharge Circuit

I have a use-case in which I require four bulk capacitors (470uF) charged to 6.4V. Each separate bulk capacitor will be used to provide the necessary energy to pulse a string of three LEDs at 5μs ...
NickRand's user avatar
1 vote
1 answer
62 views

Protection from live casing without true ground

I guess my question is probably trivial with an expected answer like 'It couldn't exist and would be dangerous', but still I keep it around. Could you build a protection circuit that would protect a ...
Simon Lang's user avatar
1 vote
1 answer
121 views

Phase neutral earth fault indicator circuit

I came across the following circuit on a random website: Source website My guess is this circuit is used by some extension boards as shown below: I understand that LED1 current (around 2 mA) is ...
Whiskeyjack's user avatar
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1 vote
0 answers
43 views

(UK) Connect the mains ground to equipment negative on the secondary side

I am planning to connect a Recom RAC04-12SC/W to an Adafruit Feather board that's powered by a 12 V to 5 V DC/DC converter. The Arduino board is using an SSR-40 DA solid-state relay (SSR) to switch ...
MuseumPiece's user avatar
0 votes
0 answers
54 views

Isolation transformer isolation side earthing best practices

I have been told I need my equipment to be isolated, but I want to make sure I fully understand when an isolation transformer is no longer isolated. The equipment I have clearly has an earth ground, ...
JCoder's user avatar
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4 votes
5 answers
2k views

Paintless (raw) aluminium enclosures connected to Earth: Bad practice?

I am producing a system with aluminium enclosures all connected to a central unit which is connected to Earth. All the enclosures of the system have their chassis ground connected together via cable ...
Tommy95's user avatar
  • 179
2 votes
1 answer
186 views

Where to connect shielded cable when you have no chassis?

I joined a project after some of the initial design decisions were made, so it’s not quite how I’d like it, which now presents me with a bit of a problem. I have two power cables that are emitting ...
Sylvester's user avatar

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