Questions tagged [earth]
The earth tag has no usage guidance.
190
questions
1
vote
1
answer
60
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 ...
- 17.5k
2
votes
1
answer
25
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 ...
- 138k
0
votes
1
answer
235
views
Measuring 240V on earth wire
One of our breakers was tripping every few minutes (which powers an air-pump and a few 12V solenoid valves.)
I went to measure the voltages and everything seemed fine.
As I went over and touched the ...
CommunityBot
- 1
2
votes
1
answer
43
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 ...
- 399
1
vote
0
answers
50
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 ...
2
votes
4
answers
676
views
Limits to use an off-the-shelf grounded AC-DC power supply with a two-prong cable
We are selling a product using an AC-DC power supply manufactured by CUI INC (SDI24-5-U-P5 datasheet). We sold the product in a few European countries but we are currently talking with a new ...
- 1
7
votes
2
answers
460
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 ...
- 2,677
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 ...
- 149k
0
votes
1
answer
143
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 ...
- 17.5k
3
votes
1
answer
557
views
Right way to couple DGND to Chassis ground
So we all know certain things:
DGND (and subsequently AGND) needs to be coupled to Chassis ground, or Earth at one position, at least, in a device.
The Earth is otherwise considered as a hazardous ...
- 33.4k
0
votes
1
answer
263
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 ...
CommunityBot
- 1
2
votes
1
answer
449
views
Cable shield connection: ground or earth
I have an analog sensor which features 3 wires: power supply +, ground (common for supply and signal output) and signal output iself. Sensor is working in industrial environment. I am using shielded ...
CommunityBot
- 1
2
votes
1
answer
92
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 ...
- 587
9
votes
4
answers
1k
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 ...
- 143
0
votes
2
answers
119
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 ...
0
votes
1
answer
100
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 ...
- 20.7k
0
votes
2
answers
253
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 ...
0
votes
2
answers
820
views
Amplifier does not sound right when balance is centered
I have an HK 590i amplifier. When the balance is centered sound is like coming from far away (voices). Sound is good only when balance is full left or right.
I researched the site and found this ...
- 3,613
6
votes
2
answers
7k
views
Does potential difference exist between Earth ground in geographically diverse locations?
Earth ground is used as a reference from which all voltages are measured in systems which are earth grounded. Because the earth absorbs or dissipates nearly unlimited electric charge, it should always ...
0
votes
1
answer
87
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 ...
- 20.7k
0
votes
1
answer
140
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. ...
- 17.5k
1
vote
2
answers
80
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 ...
- 384k
1
vote
2
answers
80
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 ...
- 78k
4
votes
0
answers
400
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 ...
- 191
1
vote
0
answers
129
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 ...
- 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 ...
- 11
4
votes
2
answers
7k
views
Grounding the chassis with capacitor
My question involves chassis grounding to earth ground.
My PCB circuit is a simple signal generator using a microcontroller. It has a separate 'ground' from earth ground, supplied by a floating 5VDC ...
- 1
77
votes
11
answers
41k
views
Why on earth are o-scopes earth referenced?
Thinking about it: You would never find a "Grounded" multimeter as robust and useful if a path to ground through the multimeter were introduced, modifying the circuit's behaviour and possibly damaging ...
- 69.2k
5
votes
3
answers
8k
views
Should I connect a cable's shield to the ground layer of board when it's isolated from earth?
I have a controller board powered by DC that may or may not be isolated from earth ground. The chassis of the device is non-metallic.
This board connects through a long (30-40m), shielded cable to a ...
- 6,216
0
votes
0
answers
27
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 ...
- 175
1
vote
0
answers
77
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 ...
- 267
0
votes
2
answers
292
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 ...
- 143
2
votes
3
answers
898
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 ...
- 13.2k
0
votes
1
answer
405
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.
...
- 7,029
6
votes
1
answer
194
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 ...
- 7,378
1
vote
1
answer
80
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 ...
- 15.1k
4
votes
3
answers
3k
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 ...
- 20.7k
2
votes
3
answers
556
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 ...
- 69.2k
11
votes
2
answers
2k
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 ...
- 17.5k
3
votes
5
answers
1k
views
Is it okay to short earth and neutral pins in 3 pin sockets?
One of the plugs in my room did not have any wires attached to the earth pin. Whenever I connect any device that has a metal casing, I get a tingling feeling if I brush my hand against the casing. I ...
- 138k
2
votes
2
answers
2k
views
Why are laptops grounded to earth via 1 MΩ resistance but desktops are not?
I measured a few laptop AC-to-DC adapters. They have 1 MΩ between the GND pin (goes into the laptop) and the earth prong (into the wall).
Desktops are grounded directly to earth: 0 Ω.
Why this ...
- 149k
0
votes
2
answers
280
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 ...
- 13.8k
2
votes
2
answers
419
views
SMPS electrical noise issue
1I'm using class 2 medical graded SMPS in our device. So earth connection not recommended. When connecting SMPS to load (contains capacitive touch LCD),
touch function is affected by SMPS noise. When ...
CommunityBot
- 1
1
vote
1
answer
527
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 ...
- 18.5k
2
votes
2
answers
196
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 ...
- 27.5k
0
votes
1
answer
102
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 ...
- 6,638
27
votes
3
answers
30k
views
Why is earth used for ground? Literally earth?
I never considered earth to be particularly conductive. It's just dirt, after all.
However, I've seen "earth ground" conductive stakes driven into the ground in order for electricity to be grounded, ...
0
votes
1
answer
80
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 ...
- 138k
0
votes
2
answers
870
views
Is earthing pointless without a residual-current device?
I don't quite understand what the situation is with the safety ground.
In theory, it evens out the voltage to zero but only if the resistance is exactly zero.
Even if the ground has only a resistance ...
- 138k
1
vote
2
answers
1k
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 ...
CommunityBot
- 1