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Questions tagged [earth]

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Ground loop issue with Raspberry Pi and amplifier board

I'm trying to run a Raspberry Pi with a USB audio adaptor into an external amplifier board via 3.5mm, then running out to speakers from the amp. Right now I'm getting a lot of electronic noise coming ...
youcloudsofdoom's user avatar
0 votes
0 answers
51 views

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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0 answers
23 views

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
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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0 answers
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
0 votes
2 answers
69 views

Is it necessary to connect the (-) terminal to earth when connecting two bench top power supplies in series to achieve a bipolar supply?

I have noticed when researching online that it is always mentioned to connect the (-) terminal to earth when connecting two power supplies in series to create a bipolar supply. Is there any issue with ...
Pernel_Sned's user avatar
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0 answers
31 views

how many electrodes for earthing a building

I have a building with 25~30 apartments 6 kW ~ 10 kW electricity registrations and a set of three motors for pumping water to a tank at the top, each nearly 800 W. Anybody can detail the ...
user1850133's user avatar
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0 answers
55 views

Inverter, neutral-earth link and RCD breaker

I'm wiring an inverter in a vehicle and I would like to use a RCD breaker to protect against isolation faults. The inverter is a Mean Well NTS-1200-224EU. The datasheet and the install manual are both ...
DamienWontContributeToAITheft's user avatar
5 votes
4 answers
3k views

Is it safe to connect AC earth to DC negative?

I'm going to use a switching mode power supply in a product. When I use no earth connection in the input, the metallic body of the PSU gives a little electric shock. (it has ~70V AC with reference ...
SajjSamm's user avatar
0 votes
1 answer
63 views

To which ground should TVS or ESD diodes connect?

I am designing a circuit with both signal ground and earth. As far as I know, a TVS should be connected to the earth. What if there is a huge voltage different between the ground and the earth? Let ...
andykkkk's user avatar
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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
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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
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0 answers
37 views

Using a Plug-In AC/DC adapter Output's Negative as Earth GND

Now, this is not a general question about any plug-in 12V DC supply with a barrel connector output. They are all different. There are those without Eath GND wire in the AC power input, those with it, ...
morzh's user avatar
  • 116
0 votes
1 answer
195 views

What is the exact reason for grounding (earthing) of a transformer? [duplicate]

I have some misunderstandings with the grounding of a transformer. As far as I know, the utility transformer's (the last transformer before my mains plug) neutral point (star-connected point of 3 ...
electroeso's user avatar
1 vote
0 answers
93 views

How to determine your ground is connected to earth

I have a tester at a remote (international) site that has been having test failures. We traced the problem to a noise issue. We were investigating the noise issues with the test/tester and ...
markshancock's user avatar
1 vote
1 answer
72 views

Earthing: TN in TT installation?

Something odd happened at work today: the whole building installation is TT, just like the whole country. L1-L2-L3 supplied to the transformer and then L1-L2-L3-N goes to the loads. I noticed that we ...
scan's user avatar
  • 11
2 votes
1 answer
38 views

Earth for custom POE+ board design

after getting the center tap pins for poe, I have an example schematic to design an EARTH ground. I have the understanding that that would be our Earth in AC over cabinet. That would remove our value ...
Wes Ellgass's user avatar
2 votes
1 answer
111 views

What is the purpose of connecting your reference ground plane to earth when doing radiated emissions testing?

In most standards it's required to connect the reference ground plane to earth. However in a lot of cases the reference ground plane is elevated above the earth by a set height. If you left the earth ...
Tony's user avatar
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1 vote
0 answers
59 views

Earth Resistivity Test on concrete base

I am planning to conduct an Earth Resistivity Test on my property. The issue is that my building's basement is entirely covered with concrete and pavement, and we intended to use the Fall-of-Potential ...
IT Researcher143's user avatar
7 votes
2 answers
673 views

Should RVs electrical system be grounded to chassis?

I have an RV with both 12V and 230V systems. The 12V uses internal battery, while 230V is supplied from outside via plug. Should I connect these systems to metal frame of vehicle (minus of 12V or ...
Ri Di's user avatar
  • 1,039
7 votes
3 answers
2k views

Dangers of floating oscilloscope

Conversation between Bob Pease and Paul Rako taken from this video, where Rako talks about modifying an oscilloscope such that it is not connected to earth: Pease: "Have you ever tried hanging a ...
Carl's user avatar
  • 4,145
0 votes
1 answer
150 views

Can this way verify whether the earth pin is grounded or floating?

I want to check whether the earth pin of the electric AC wall socket is really connected to earth. But I only have access to the socket’s phase, neutral and earth inputs. I have no access to any known ...
GNZ's user avatar
  • 1,811
2 votes
1 answer
166 views

Connecting '-' terminal of the power supply to the earth GND

I've already asked a similar question in the past, but I want to make sure I understood things correctly. Attached is the current lab setup for my chip testing. The green square represents the main ...
Emm386's user avatar
  • 607
11 votes
4 answers
3k views

USB peripheral: connecting USB shield to GND?

I have read through many recommendations articles, and many StackExchange questions, but haven't come up with any clear understanding as there are many conflicting information out there. The simple ...
Marek's user avatar
  • 163
0 votes
2 answers
142 views

Will I see a sine wave if I connect one oscilloscope terminal to the phase and another to the earth?

I have a doubt regarding a thought experiment I am conducting since I lack access to proper grounding at both my workplace and my house. The experiment involves the following setup: I intend to ...
SKGadi's user avatar
  • 862
1 vote
1 answer
400 views

Grounding / earthing more than one places

My home earth pit is very old and it's located at the front of the house. When checking the line and neutral I am getting average 250v. When checking the Line and the Earth, I am getting 238v. Now, I ...
Riyas Rawther's user avatar
0 votes
2 answers
2k views

Earth Leakage Breaker Trips .. Where is the problem?

I am trying to install a UPS in my home .. diagram of the circuit attached. UPS is in first floor. Both floors have separate main circuit breakers .. Ground floor has Earth leakage breaker while First ...
O Ishtiaq's user avatar
0 votes
1 answer
143 views

Grounding a Metal Roof

I have a steel roofed home that is powered from a solar system 100m away. The only earth is that on the incoming power cable. (220V 50Hz) Should I earth/ground my roof and if so to an independent ...
Jeff's user avatar
  • 1
0 votes
1 answer
214 views

Correct configuration for adding an earth terminal block?

I have a small motor controller test board setup like the diagram below: A few loads such as a motor controller, and some switches are connected to the live and neutral terminal blocks for power. ...
blueturkey's user avatar
1 vote
2 answers
87 views

Creating a thermostat regulated water heat bath that won't electrocute me if I touch the water

I have a basic knowledge of electronics and an even better knowledge of film photography. I'm looking to create my own heated water bath with a thermostat that will allow me to adjust the temperature ...
nizzlebizzle's user avatar
1 vote
2 answers
96 views

Is there any way to easily gain access to "actual ground" in an IT grounding system?

As the title asks, is that possible? By "easy access" I mean through some connection I can find inside my home, rather than burying my own grounding electrode and running wires from it to ...
Outis Nemo's user avatar
4 votes
0 answers
757 views

What is a short-circuit proof cable?

German norms and standards (VDE 250 Teil 602) specify, that wires and cables, rated for 3kV can be considered as "short-circuit proof" and "earth-fault proof" in low-voltage ...
syoma's user avatar
  • 191
1 vote
0 answers
233 views

Making earth pit in swampy area

I recently made an earth pit in a swampy area. I dug the earth up to 5 feet as water was available at 4 feet depth. I poured charcoal and salt in the ratio of 3:1 . After braising the copper plate ...
ark1974's user avatar
  • 175
10 votes
1 answer
2k views

How many "grounds" are there and what is the difference?

I stumbled upon many terms for ground, naturally as newbie I got very confused. ground earth chassis ground earth ground common ground signal ground Are there any more? I assume some are for AC and ...
komrad2236's user avatar
0 votes
0 answers
28 views

Change the range of Earth Resistance Meter to measure lower resistance values

I have an analog Four Terminal Earth Resistance Meter with 100 ohms as the maximum range and 1 ohm is the resolution. The scale is linear. I need to measure low resistances below 1 ohm. How can I ...
ark1974's user avatar
  • 175
1 vote
0 answers
89 views

Why are conductive chassis double insulated appliances allowed in the UK?

MacBooks are infamous for 'buzzing' to the touch while charging. If another (properly Earthed) laptop touches one, it can flicker the screen or shut down. If I plug one of these same properly Earthed ...
OJFord's user avatar
  • 307
2 votes
3 answers
2k views

Earth pin in a 3-pin mains plug [closed]

I bought a new pressure washer online and it has a 3-pin plug as shown in the picture, but there are only two pins protruding out from it. The two pins fit into my standard 3-pin socket and it works ...
androidguy's user avatar
1 vote
3 answers
1k views

What is the difference between earth and earth from a power outlet?

I'm having a real difficult time understanding the following statements from various sources: That's what I was told: don't use the earth pin from a power outlet as your earth because it's dangerous. ...
Marco's user avatar
  • 1,031
1 vote
1 answer
105 views

Are shoes comparable to capacitors if receiving electric shock from one lead?

I seem to not totally understand the way how we can receive an electric shock when touching only one lead of a general power outlet (230VAC): Are our shoes/wooden floor/concrete like a capacitor ...
Niels's user avatar
  • 222
4 votes
3 answers
8k views

How can I check if I'm properly grounded?

I figured that if I used my trusty ol' calibrated Fluke 77 multimeter and: Set it to Ω measurement Measured between the ground terminal of an electrical outlet and a bare metal pipe fitting on a ...
Göran Ingvarsson's user avatar
2 votes
3 answers
1k views

What is the potential of earth relative to mains live and neutral? [duplicate]

I'm confused about the theory of earthing in mains electrics. In particular, how the potential of "earth", the ground or literally the soil beneath my feet relates to the live and neutral ...
nick's user avatar
  • 21
11 votes
2 answers
3k views

Ground Symbol, which one I should use?

I normally use this symbol in my schematic as my signal ground. But recently my manager asked me to use this symbol instead because the one that I am using is the earth ground and I should use the ...
user3562851's user avatar
0 votes
2 answers
454 views

Thermocouple readings affected by PE

I designed a controller for an electric pizza oven. The PCB has an MP-LDE03-20B0 power supply module on it. Everything works great except for measuring the temperature in the oven. I use thermocouples ...
Marek's user avatar
  • 163
7 votes
1 answer
304 views

Addressing poor Earth resistance on hill top

I work in a radio station situated on a hill top. The Earth resistance measured at this location is quite high, measuring around 9 Ω. There is no deep gorge nearby to make a fresh Earth Pit. How can I ...
seccpur's user avatar
  • 391
0 votes
2 answers
418 views

Earth wiring in an AC circuit

In this circuit there is a power supply source of main AC 220 V - 50 Hz and a load: There are two wires out of the main supply (neutral) and (live). The earth is connected to the neutral. If I am ...
Tito's user avatar
  • 465
1 vote
1 answer
831 views

Van conversion hookup point AC Earth to chassis negative

I'm helping my brother convert his van into a camper and installing solar panels, a leasure battery, and hook-up point, but I'm slightly confused. I've been working on the hook-up and loads of things ...
Martin Barker's user avatar
0 votes
1 answer
417 views

Grounding resistance dependency on distance

I am currently learning about grounding in electrical installations and there is something that intuitively doesn't really make sense to me. It is related to the resistance measured between two ...
zomnombom's user avatar
  • 101
2 votes
2 answers
304 views

ESD damage without earth ground

Can you explain how a totally floating PCBA (with semiconductor chips/ components stuffed, but no any connection to earth GND) is damaged by an ESD event from human touch? If human body is charged to ...
user315429's user avatar
0 votes
1 answer
132 views

CNC Servo System Grounding

Here it's a sketch of a simplified CNC servo system. The servo drives are non isolated (Digital GND connected to Power GND, drawn as GND) (My main question on the picture too) #1: Why some ...
Buruhazard's user avatar
0 votes
1 answer
82 views

Can I use an exposed water pipe as a reference only?

The outlets in my working space are unearthed, but there is an exposed copper bit of heating pipe that appears earthed (there is 230 V between it and the outlet). Now, after some research here I've ...
Bart van Heukelom's user avatar

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