Questions tagged [earth]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
0answers
646 views

Potential difference between DC floating power supply and earth ground

I have a question about a simple DC floating power supply: it is as simple as possible, secondary coil -> bridge rectifier -> filter cap, as shown on the figure below. If I connect the input of the ...
0
votes
4answers
443 views

Tiny shock from 230V AC?

So first at all this question isn't really about electrical engineering, but about electricity in general. However, I think this is the best place to ask, correct me if I’m wrong. Also I’d like to ...
13
votes
6answers
2k views

How to stop plastic granules sticking to the iron wall of their silo?

In our factory, we have some large (8 meters tall and 3 meters in diameters) iron silos for storing the plastic compounding material. Every time the silos are getting unloaded from the granules, the ...
2
votes
2answers
980 views

How to mount a toroidal transformer in a waterproof plastic case

I have a toroidal transformer with mains input and 24V output, which I want to mount in an IP65 ABS plastic case. The transformer comes with two rubber and one metal disc for mounting, along with a ...
2
votes
1answer
287 views

Earth ground to dsub9 shell

I have an enclosure containing an earth ground line. It has a brass earth ground bus that is connected to: the input earth pin of a 120V single-phase mains IEC320-C14 connector the output earth pin ...
4
votes
3answers
7k views

How do I verify if a conductive mat is getting “Earthed”

Explaining to me about electricity is like explaining to your Grand-Ma about it. So please be kind and gentle :) I bought an Earthing Mat from "http://www.amazon.com/dp/B003RLOBOK". It includes a ...
0
votes
4answers
2k views

Neutral and the earth are bonded at the main panel or the substation but why is only earth wire used for safety?

Typical distribution system can be illustrated as: Here are my premises (and assumptions): 1-) Chassis in a house must be connected to the earth, not to the neutral. 2-) The earth and the neutral ...
0
votes
1answer
128 views

ESD damage due to earth potential drop?

When lightning strikes or the earth wire (from the wall outlet) suddenly gets charged negatively for whatever reason, then, in theory, can it cause ESD-damage to a PC? Because the grounding wire (...
1
vote
1answer
124 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 ...
2
votes
2answers
299 views

Clamping the output ground very close to earth ground

I've noticed that the output ground of most power supply are not quite the same as earth ground. The DC is nearly negligible, but there is usually an AC component between output ground and earth ...
1
vote
2answers
133 views

Charge after turning off an electronic device

Let's say I've just turned off my Raspberry Pi and put a imaginary boundary around it. Everything not on this picture is outside the boundary. Is the net charge, inside the boundary, neutral?
0
votes
0answers
35 views

Is it possible to detect and filter noise on an earth?

I ask because I have a solar array on my house with micro inverters. The monitor (an Enphase Envoy) no longer detects the the inverters. Troubleshooting suggests noise on the earth, perhaps caused by ...
1
vote
2answers
1k views

Grounding without Ground

My system use only line and neutral connection from mains (no ground.) Inside this system it is converted to 5V using SMPS. My enclosure is metal, I need to ground this enclosure. Since I do not ...
10
votes
2answers
6k views

Are countries that use 2-pin plugs less safe than countries that use 3-pin plugs given that the earth is missing?

Will there be occasions when using 2-pin plugs is safer than 3-pin plugs? Is it accurate to say that 3-pin plugs are always safer given the presence of earth?
0
votes
6answers
873 views

Is 'grounding a desktop PC via 1MΩ resistor' unsafe when working inside the case?

Activity: maintenance (installing/replacing hardware parts, like motherboard, CPU, DIMMs, graphics cards) inside an ATX case. Goal: ESD protection and user safety. Original question: Is 'grounding a ...
19
votes
3answers
5k views

Static shocks all over the building

I just came from the local library, it’s quite big, and most of it is made of an architectural design using mostly painted metal book shelves painted with some kind of anticorrosive paint along with ...
2
votes
2answers
621 views

What is the difference between capacitive fault currents and resistive fault currents?

http://uk.megger.com/battery-ground-fault-tracer-bgft\ This website claims that it's product can differentiate between these two fault currents. But I don't know what the difference is.
0
votes
2answers
1k views

Why are laptops grounded to earth via 1E6 ohm resistance and desktops not?

I measured a few laptop AC-to-DC adapters. 1E6 ohm between GND pin (goes into the laptop) and earth prong (into the wall). Desktops are grounded directly to earth: 0 ohm. Why this difference?
0
votes
4answers
1k 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
1answer
69 views

How to decide earth trace width in protection circuit?

I am using the earth trace for protection circuit in telecom system. The protection circuit includes MOV, sidactor & fuse. So please suggest How to calculate the Earth trace width.
0
votes
1answer
620 views

Why am I measuring earth to line voltage as zero? Is that what it supposed to be?

I have a confusion about the topology below: I was wondering the potential difference between the line and earth. So I decided to check this through a 3-prong plug. I thought I would read the same ...
0
votes
3answers
1k views

Does grounding to earth make a circuit (allowing electricity to flow)?

This question is mostly extending on a question that has been asked here: Single terminal of voltage source attached to earth ground I'm learning the basics of electronics and this question has ...
0
votes
3answers
135 views

Earth Grounding an HV Power Supply

I'm using a Matsusada HV Power supply up to 20 kV. The manual mentioned that the ground terminal of the chassis should be connected to earth. And I had a few questions What are the best, or at least ...
-1
votes
1answer
165 views

How to earth connector with plastic case

My board has a power connector from Glenair 171-006. Input is 5V DC. This connector has a plastic case. My question is, can I use one of the connector contacts to connect to EARTH? Will it cause any ...
1
vote
0answers
183 views

DIN Rail with In-Rail Bus - GND/PE design question

We are designing a system that consists of several modules that are mounted on a DIN rail. They are connected to each other using an In-Rail Bus system like this: System design: The 5 bus line ...
2
votes
2answers
1k views

Ground Fault Protection in Unearthed HV Systems

I'm working somewhere that uses an unearthed 3.3kV network for safety critical drives. I've been learning about ground fault detection on ungrounded systems, using VT's and measuring voltage across a ...
1
vote
2answers
143 views

Connecting a battery powered circuit to the earh ground [closed]

In the following circuit what would be the effect of tying a circuit to the ground from the -2V rail ? I know that no current would flow to the ground since there is no closed loop formed, but ...
1
vote
2answers
390 views

Permanent magnet DC motor earth wire

I have just inherited a piece of equipment that is powered by a 12V DC permanent magnet motor. My hope is to drive it using an Arduino PWM and a H-Bridge to manage the current requirements (7.3A ...
0
votes
3answers
1k views

Wire the green ac earth wire in wooden chassis?

My own power supply is just about finished. Since i live in Europe the voltage here is 230v, from that it goes into my step down transformer that steps down the voltage to around 20 V AC and then into ...
0
votes
1answer
333 views

Is it possible for lightning strike to travel up ground / earth pin on a mains outlet?

I live in a country that follows the UK mains specification, where there are 3 pins on a wall outlet with the topmost pin being earth/ground. Now, is it possible that during a lightning strike, extra ...
0
votes
4answers
418 views

In any electrical equipment having single ph 230 v ac supply ,if neutral and earth wire exchanged then what will be the consequence

I am handling the supply in a locomotive coach and have noticed that the neutral and earth wires have been accidentally flipped,inside the appliance(hot case) is there a problem from the safety point ...
1
vote
2answers
2k views

What is the difference between neutral and ground?

What is the difference between neutral and ground? I do not understand the difference.
9
votes
3answers
6k views

Why is chassis connected to earth ground but not neutral?

My question arose from my previous questions. Here depicts how electricity is distributed to houses:http://www.epanorama.net/documents/groundloop/feed_1phase.gif It seems like the earth ground and ...
1
vote
1answer
1k views

Is power DC power supply ground, connected to the chassis earth on a desktop PC?

When I plug a data-acquisition PCI card to a PC, I'm trying to picture the ground connections. Some following confusion arises: Is the PC motherboard's ground and PCI's ground common? Does a PC have ...
4
votes
1answer
2k views

What is the effect on noise immunity of a floating shield on a shielded twisted pair

We have an installed system where resistive sensors are connected to some electronics by shielded cables of between 2 and 10 metres. The cable is a twisted pair sheathed in a stainless steel braid. ...
2
votes
2answers
622 views

Is some protection necessary for a RS232 link between PIC-MAX232-Computer?

I have a circuit with a dsPIC which communicates to a computer using a MAX232 (there ain't any optical isolation). The circuit ground is not bounded to the earth. But the equipment case is earthed. ...
5
votes
1answer
409 views

grounding a mailbox - isn't it already grounded?

I live right next to some suspended power lines. My mailbox is very close to them, and anytime I touch the mailbox, I get a mild shock. It seems to me I need to do something to ground the mailbox but.....
2
votes
2answers
3k views

EM MWD Gap Sub Telemetry Theory Explanation in Drilling Applications

I have been doing an extensive amount of reading on EM (Electromagnetic) Telemetry in MWD (Measurement While Drilling) applications. From my reading, there are a few considerable gaps in my ...
2
votes
1answer
996 views

Adding a resistive path between live conductors and earth - safety issues

(Note: I am in the UK so the terms 'line' and 'neutral' refer to the two live mains conductors) I am trying to establish a list of safety issues which I should be aware of if I decide to introduce a ...
3
votes
1answer
192 views

Strange Earth Voltage Reading

Ok, my first question here. In my spare time, I run a small PA company. On Saturday, I had a concert at a sports center where I´d never been before. Power for the event came from a standard 5-pin, 16A ...
2
votes
0answers
180 views

Should I connect stepper motor case to mains earth or power supply V-

I have a stepper motor driver, the sockets have the expected V+,V-, etc. However there is a bolt with a grounding symbol on the outside, I think this connects to mains earth? The third pin on a plug? ...
0
votes
1answer
179 views

Stop earth from introducing noise to piezo circuit

I am currently prototyping a circuit which measures pulses on piezo-electric sensors; however, I seem to be having an issue with noise. When the circuit is battery powered (and therefore floating), ...
0
votes
1answer
138 views

Is that possible to create a virtual ground,for electrical purposes? [closed]

It might sound crazy, but I have seen many houses that doesn't supplied with electrical Ground (earth), and today there are many devices exist that need electrical ground. I know that some people ...
5
votes
2answers
4k views

Why do some electrical devices have a ground and others don't?

I noticed in my kitchen that the toast oven and the range hood had a ground fault, first by using a voltage detector pen, when getting near it the pen would activate from a distance (around 5cm ...
0
votes
1answer
843 views

Is earth of a 3-prong AC/DC adapter is connected to the GND of DC output?

Below is an illustration of a 3-prong AC/DC adapter(such as a laptop adapter): Here I marked the primary earth ground as 'a'; and GND of the secondary(DC) as 'b'. My question is are these grounds ...
1
vote
2answers
127 views

Does Surge Spike Protector box can protect my PC even from Thunderbolts? [closed]

My house isn't wired for an Earth ground. I am using a Surge/Spike Suppressor box to protect my computer. Will this box protect the computer during lightning strikes? Is the design of the suppressor ...
0
votes
1answer
5k views

Different types of grounding [duplicate]

Can somebody briefly explain the different types of grounding with examples? Chassis ground Earth ground Signal ground
-1
votes
1answer
86 views

Is earth wire of any help in this situation [closed]

I have an appliance that has the wires connected well and it has been grounded (earthed). If I accidentally get into contact with a live wire will I get electrocuted considering it has already been ...
6
votes
5answers
1k views

The path of electrons in AC circuit?

I have a question regarding the AC circuit shown below. If we ignore the voltage drop caused by the long cable, I think the device will work and the circuit can be considered as a closed circuit. Now ...
5
votes
3answers
19k views

Why the neutral of the UPS or inverter or generator is advised to be earthed/grounded?

In my company we had few earthing related issues. When an consultant was brought in and apart from solving the issue, a suggestion was made to ground the neutral of the UPS and diesel generators that ...