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Questions tagged [earthing]

The tag has no usage guidance.

-4
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1answer
95 views

Earthing system on a mobile vehicle?

We have an electrical system which needs a low impedance earthing system below two ohms. We have provided a proper earthing system in our factory and it works well. Now my question is if the system is ...
0
votes
1answer
47 views

Wiring a traffic light

So I have aquired 1 light of a traffic light that I salvaged from a local dump. I want to try and connect the light to use it like a lamp, however I am a little worried by it as the connector only has ...
1
vote
0answers
48 views

Connecting the secondary side of ignition coil to earth

I have an ignition system used for some application. During the testing I found that spark plug is producing EMI due to spark occurrence and high voltage is traveling through the wire. So to ...
0
votes
2answers
102 views

Ground, common, and Earth ground confusion

I am learning on transmitters and input modules nowadays. But the usage of word 'ground' is confusing me. What does 'ground' mean there (earth or power supply common)? If it is earth ground, why we ...
0
votes
1answer
41 views

Earth connection on this single phase AC motor

I bought a drill press recently that comes equipped with a 0.5HP single phase AC motor. I have wired it up as per the instructions that came pasted on the motor but I do not see a terminal for earth ...
0
votes
1answer
95 views

Why not keep distribution transformers secondaries floating? Why do we need to earth them?

We use isolation transformers for many reasons, one of them is may be safety. So why not just keep the distribution transformers floating? If they're floating, then someone touches the live wire, I ...
2
votes
1answer
66 views

Earth Ground Portable Generator

I recently bought a pure sine wave 2kV portable generator to use for camping. In the manual it states that the generator should be grounded to actual earth through a metal stake and then attached to ...
1
vote
1answer
46 views

What is the relationship between Ground Potential Rise (GPR) and Source Voltage?

I am looking at the results for an earth grid study for a 50Hz substation. Primary Voltage (Vp) = 11,000V Secondary Voltage (Vs) = 415V Secondary Fault Current (If)= 24kA Secondary Grid Current (...
0
votes
1answer
50 views

Power supply and pcb connections to ground, earth

I am planning a pcb which is powered by two switching power supplies LRS-150F-5 (230 V/AC to 5 V/DC) LRS-150F-12 (230 V/AC to 12 V/DC) . The power supplies are mounted in their own metal box and the ...
0
votes
0answers
53 views

Earthing for Satellite Dish

A friend who is an electrical engineer (heavy current) told me to earth my satellite dish and its fixing pole against lightning, using a thick copper cable (6 sq.mm) and an earth spike. He also said ...
1
vote
1answer
120 views

why capacitor connect serially with resistor on the earth pin

I have this grounding mat, inside the electrical socket as shown in the picture, there are a capacitor and 100k ohm resistor connected serially to the earth point, the grounding mat is supposed to ...
0
votes
3answers
105 views

Can current flow to earth in TN-S Earthing system?

The above illustration of a TN-S Earthing system shows one shared connection to earth between neutral and protective Earth. Assuming a short circuit occurred, in the brief second before detected by a ...
0
votes
0answers
74 views

Out of limit Touch Up current - Servicing PE

My device may not be connected to PE during normal operation, but does require 230VAC mains input. I know I have to take the touch up current of any Y-caps into consideration when developing my ...
1
vote
1answer
41 views

x2y caps and common mode chokes (using both)

I am designing a ultralow noise PCB board. Common mode noise has to be minimized, so I have a question I am planning to use a CMC on power input and to further decrease the common mode noise I also ...
0
votes
1answer
50 views

How does the power station compensates for the current that flows down to earth due to domestic body-current faults?

I know current flows in a loop and energy is used to move it in a loop. Now suppose we get a single phase AC (220/120V) electricity supply for our home and we have earth connection to prevent shocks ...
0
votes
0answers
265 views

Connecting Protective Earth (PE) to DC ground

This question has a bit of application background so please bear with me: I'm working on a LED lighting system. The controller (MCU, led drivers and led supply) will be powered by a single DC ...
0
votes
0answers
80 views

No grounding system available for oscilloscope, what other options are available?

Many old buildings/houses in Europe are so old that they were not built with a grounding system. I happen to live in one were this is the case. The problem is that if I want to use an oscilloscope, it ...
0
votes
1answer
116 views

Question about ESD wristband and lightning

as far as I know all ESD wristband's ground connection has an 1M ohm resistor built in for safety. So what would happen if I am working on lab wearing ESD wristband which is connected to the home ...
0
votes
1answer
132 views

SMPS output grounding (PE)

I am designing an ultralow noise 5V/3A SMPS. On the DC side, I see the ground (DC) is earthed (chassis ground) using a direct connection 0 ohm or using a Y capacitor. What are the differences between ...
0
votes
1answer
246 views

SMPS chassis ground and earth ground

I'm designing a ultra low noise smps and I have some questions about ground/earth chassis. The main goal is very low noise on DC output. Earth (PE) should be connected to one point (only) to the ...
0
votes
2answers
172 views

Earthing Bracelet safety

I have a family friend which likes to sleep with a direct connection to earth. This question is purely to do with safety, nothing to do with what you or I or anyone for that matter believes about this ...
2
votes
1answer
120 views

Is there any technical/safety reason to ground off-grid solar?

Unlike this similar unanswered question I will keep this question here focused and specific. Imagine an off-grid solar system: panels, charge controller, battery, inverter, AC and DC appliances. ...
0
votes
1answer
64 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 ...
3
votes
1answer
452 views

Double isolation with earthing symbol inside on power supply

I was looking at my laptop's power supply and i noticed this symbol: To me totally looks like a "double isolation class 2" IEC 61140 combined with the IEC 60417 - 5018 symbol (Functional earthing; ...
0
votes
1answer
102 views

How does circuit completes when physical ground(earth) is used as neutral? [duplicate]

In my locality there is no neutral wire. Our transmission company runs only 3 wires(all line/phase) and no neutral(4th wire) at all. Out of three, one runs to our houses. I know it sounds incorrect, ...
-1
votes
3answers
537 views

TT Earthing System [closed]

Ok guys I can't just understand a thing of the TT Earthing System, why on it the ground of the power cabin is connected to the neutral of the power cabin?
-2
votes
1answer
151 views

Earthing resistance [closed]

I don't understand a thing about ground resistance. Let's say that the power plant servicing my house is placed at a distance of 100 meters from it. If we hypothesize a resistivity of 100 Ω*m, the ...
5
votes
1answer
1k views

RS-485 shield and ground wiring practice

After some reading I was convinced that I have three options: The best: connect A and B lines to a twisted pair, signal ground (SG) line to therd wire in the cable (or to a second twisted pair) and ...
43
votes
10answers
16k views

Why is main's neutral tied to earth?

My dad is an Electrician and I myself am an Electronics Design Engineer, and to this day he still hasn't been able to give me a good reason for this. Consider the two following pictures/situations - ...
0
votes
0answers
37 views

Filter for noise cancellation coming from earthing system

I am about to use a partial discharge detector but there is one problem. The noise that coming from the earthing system is high enough that affects the PD measurement. Is there any way to filter the ...
-3
votes
3answers
287 views

grounding a moving robot

I'm am designing an external battery pack for a robot, Pepper, a robot by Softbank (I'm am not making the battery itself but the circuit connecting two batteries). I am going to connect a 25V (LiFe-...
1
vote
2answers
497 views

Connecting `signal ground` to `earth`: should I?

We usually have 3 wires in the outlet: L (line), N (neutral) and PE (protection earth). It is pretty common that the N is tight to PE in the distribution board or power plant. If the device have ...
0
votes
1answer
155 views

Grounding a soldering iron and it's enclosure

So, I assembled a soldering iron kit and put the control unit in an aluminum enclosure and intend to use a Mean Well SP-240 24V power supply with it. I just wanted to verify a couple of things. The ...
1
vote
1answer
50 views

Wire multiple protective earth conductors together

I'm currently designing a circuit that will use a microcontroller and several relays to switch multiple loads connected to AC mains, and the connections to mains will be inside the enclosure. I'm ...
1
vote
3answers
400 views

Current through protective earthing

Is there a way to estimate the magnitude of the current that would flow through the protective earthing of an electrical equipment in case of a fault? I recently had an equipment fail in this manner ...
5
votes
2answers
669 views

Confusion in grounding shield wires of transducers

There is a 6-wire Wheatstone bridge type load-cell and one of the wire is called shield and it is electrically connected to the metallic case of the load cell as below(I marked that with yellow ...
0
votes
2answers
54 views

Exposed bulb/wiring project [closed]

Apologies if this is the wrong exchange. I would like to start a home project, in which screw-in bulbs are left mostly exposed, and connected to semi-flexible wire. Something similar to this: A ...
-1
votes
1answer
45 views

How reliable are “earthing detectors” on surge protections?

I have APC's surge protector and it can, according to the manufacturer, detect if power socket is earthed.How reliable are these detectors? Surge protector link
2
votes
1answer
96 views

Is there a way to check integrity of earthing provisions?

We have a complex network of earth wires and earth pits. These earth wires are connected to power panels and CNC machines. However, the earthing system is very old and poorly maintained. Is there a ...
1
vote
2answers
419 views

What is the proper way to earth aluminium profile frames?

Frames built with aluminium profiles (such as 4040) do not make good electrical contacts at joints, because of the surface oxide protective layer. What would be a good way to properly earth these ...
4
votes
1answer
468 views

ESD Protection on Un-grounded Chasis

I am designing a product solution which needs a 240V AC to 12V DC. I am getting that done with one of those standard laptop chargers from a reliable OEM(with necessary certifications) which looks like ...
1
vote
1answer
112 views

Op. Amp. read variation when Earth is connected with Signal GND

I've made this simple circuit to read the line voltage (the 1 pin is conected in a uC by a resistor): In the image NEUTRO is Mains Neutral AC, FASE is Mains Line AC and TENSÃO is the signal to the uC ...
3
votes
2answers
380 views

Earthing terminal detection and indication

I have developed one instrument and for safety purpose. I want to ensure that machine start only when earthing terminal properly connected to machine and voltage between earth and neutral terminal are ...
0
votes
1answer
550 views

How to connect earthed metal chassis to DC ground?

I have around 12 purely DC PCBs inside a metal case. Each has a MCU which connects to the main controller PCB with SPI or I2C. Each is powered by one shared ATX PSU which also sits inside of the case. ...
4
votes
5answers
1k views

Why is there no current sharing between neutral and ground?

In the first system, will lamp1 turn on? If yes, then why is there no current sharing between neutral and ground as shown in the second system? I always read that neutral is a current carrying ...
2
votes
3answers
994 views

when do I need to have a floating/non-floating input at a SMPS?

I am studying reference designs for my PSU, and they all have a floating earth connection (or have no earth connection). When I inspect industrial power supplies, some have earth connection, some have ...
0
votes
4answers
811 views

Antistatic mat instead of antistatic wrist strap?

Just to make sure, before doing something silly: can i place a 2nd antistatic (dissipative) mat on the floor (along the 1st mat on the table) and stand on it with bare feet? Instead of wearing an ...
0
votes
0answers
63 views

Designing equipment enclosure and using anti-tamper earthing bolts

A bolt head is often seen on the outside of the enclosure of many devices (e.g. power supplies), marked as earth bonds. The head of the bolts I am referring to does not have the usual drive geometry, ...
-1
votes
1answer
355 views

Is it necessary to use 4-pole circuit breaker for TN-C-S system?

It seems that in TN-C-S system is necessary to use 4-pole circuit breaker, I want to know it's correct or not? and if it's correct, which document or standard is used to prove it?
0
votes
2answers
517 views

How do I wire this AC motor to a UK plug?

When wiring this 220V, 60rpm AC motor to the mains, it turns perfectly with the live and neutral wires connected to terminals 1 and 2 and with the earth wire disconnected from terminal 3, however it ...