Questions tagged [earth]

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39 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 ...
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1answer
38 views

How a high Earth to Neutral voltage affects electronic equipment like L2 or L3 switches? [closed]

We have lot of communication equipment installed recently in our organisation. From then, lot of pressure on us to reduce Earth to Neutral voltage at the input of our communication equipment like L2 ...
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2answers
46 views

Shared Transformer Grouding

I'm looking into creating positive square wave sharing same reference ground as primary on the secondary side of a transformer without using a rectifier. Assume that I have ability of providing the ...
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0answers
57 views

Single wire earth return system

So, in a single wire transmission system, the earth acts as the return path for current to "flow back to source". Would this work for anywhere on earth, say, if we transmit current on a single wire ...
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0answers
38 views

Is there a potential earth leakage or is it something else?

I'm facing an issue in my house since last Christmas. When the lights or appliance with motor in any room are turned off/on the TV would go out and come back on in a short span (as if the power went ...
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1answer
48 views

Connect the oscilloscope to equipment with a common neutral and ground

I watched a video. At 3 minutes, the situation is shown when neutral and ground are joining. Why can this be dangerous? If we are talking about an oscilloscope, the crocodile must already be connected ...
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1answer
64 views

What effect does the internal re-arrangement of charges have on the existing current? [duplicate]

In the figure, the circuit is physically isolated from Earth (The black line at the bottom). The red capacitors are parasitic capacitors. Under switching conditions the node voltages relative to the ...
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3answers
654 views

The chance of a lightning strike - reduced or increased?

If I connect the receiver and TV body to the earth, does it reduce or increase the chance of lightning strikes the dish antenna?
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1answer
76 views

Is it OK to have a connection between 0 and PE on a DC device?

I have a device meant to be used inside electrical cabinets. It has a metal casing and is powered by 24V DC. It has three power connectors: 24V, 0V and PE. I was surprised to find out that 0V and PE ...
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0answers
38 views

Problem with DC motor, GND and metallic parts (and yes/no PE)

I built an actuator where noise, presumably, gives me problems. The hardware is: a 230->24 volt transformer which feeds an electronic board which drives a DC motor (via 16 kHz PWM) and other small ...
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0answers
41 views

Earthing portable generator directly to earth pin of powerpoint?

I have just bought a generator was wondering is there a reason I cant ground it to the earth pin on a power point in my home? Im thinking a cable with single earth wire and power plug on the end so I ...
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3answers
101 views

About floating ground and circuit problems

Good morning, I have a power supply with floating ground that drives my circuit. Since the circuit doesn't work as expected (it works fine only if the ground is tied to earth) I did some measures with ...
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2answers
56 views

Best practice for earth connections on isolated equipment

We have a piece of equipment that runs on 230VAC being shipped to the USA (110VAC). We are shipping it with an isolation transformer (5kW) The input is E,N,L and the output is neutral and live (...
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1answer
99 views

AC to DC power supply - earth ground capacitance on DC output

I have a mains to 60v DV power supply that I’m using for a project. Needless to say it managed to give me a bit of a shock. This surprised me as it’s supposed to be floating. With no load the power ...
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3answers
139 views

Is EMC shielding of a grounding wire required?

Consider the following 2 use cases: Fully electric vehicle with 2 different insulated voltage systems: 1 high voltage @1000V DC insulated from chassis and 24VDC system with minus pole (-) at chassis. ...
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0answers
66 views

What is the impact of Earth's magnetic field polarity on consumer electronics?

Earth's magnetic poles are known to have inverted in the past. How are commonly used circuits or component of consumer electronics (from energy production/transportation to TVs, mobile phones and PCs) ...
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1answer
79 views

Oscilloscope and Electrical Safety

I was reading an article in a magazine in which the following sentence is written about a circuit that generates a certain waveform on a load R (in which one of its terminals is connected to the earth ...
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0answers
53 views

What do the white and green colours on the earth leakage CB denote?

I've come across two 4 pole earth leakage circuit breakers, one with the all green lever and another with white levers for phases and green for neutral. Is there any special meaning to this? I've ...
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3answers
196 views

Power Supply Earth for Bench Testing

I work in a typical electronics lab, with resistive earth mats, ESD straps and isolated DC power supplies to test prototype PCBs. I prefer not to use the power supply earth-ground, and to leave the ...
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3answers
88 views

I thought that the ground was different from “earth”! [duplicate]

According to Paul Scherz in his Practical Electronics for Inventors, he mentions in Chapter 2, Theory, the following: Typically, the earth, with its infinite charge-absorbing ability and net zero ...
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3answers
67 views

Electrical Standards - Earth Wire at Low Voltages?

I got a question about safety standards: I'm designing a consumer device and I'm not sure whether I need an earth wire. I have an AC-DC converter plug that outputs 5 V and up-to a maximum of 1 A ...
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2answers
82 views

Live wire and ground question

I am trying to fully understand the danger of AC voltage but still I have some questions... I understand that human body has a capacitance that facilitates AC current penetration. I also understand ...
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1answer
123 views

Why am I reading 22VDC / 69VAC when measuring between myself touching a MacBook and ground?

If I put the positive probe of my multimeter on earth, and touch the negative probe with my hand, while another hand is touching the metal surface of my MacBook, I get around 22VDC or 69VAC. I cannot ...
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0answers
45 views

Earth ground and return path [duplicate]

During a fault, how does current flow through the earth wire when the earth wire has no return path? Doesn't the earth wire in earth grounding terminate at a copper plate located deep underground, ...
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8answers
5k views

What is the right way to float a home lab?

I just got myself some new toys for my lab at home like 30V DC power supply, KKmoon signal generator and a Rigol DS1052E. I want to float everything, because I don't want to spend any money on stuff ...
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1answer
56 views

Do the dipole antenna edges have earth potential or is it a closed circuit made of co-axial cable?

I understand the shape of the dipole antenna, but how is it fed so that the current only flows through one direction during the half cycle? Even in a normal pole antenna, is there a ground at the edge ...
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1answer
281 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
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1answer
165 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 ...
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3answers
48 views

Connecting the Block AIM 5.0/2.0 auto-transformer to UK three-wire plug

I am not electrically very knowledgeable person. At the moment I am trying to connect a Block AIM 5.0/2.5 Auto-transformer to a piece of very sensitive medical equipment. The auto-transformer was ...
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2answers
69 views

How to insulate DC from earth noise while keeping it referenced to it

I have an AC/DC converter (220 to 24) inside an electrical cabinet. The 0VDC is referenced to earth, like this (couldn't find a symbol for an AC/DC converter in the schematic editor so I made a dirty ...
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3answers
117 views

Earth Fault in a TT Network: Current loop, or charges flowing from one grounding to the other?

There are serveral things I (yet) don't understand about the T-T-earthing system. The most important one is that I don't understand which way the the current takes in case one of the conductors (for ...
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4answers
629 views

Floating Source Voltage Difference to Earth

I was reading about floating voltage on web but there is something that I couldn't understand. I attached photo of circuit. As you see it shows 60v difference between neutral of flating source and ...
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1answer
2k views

Proper Chassis Grounding

I'm starting to design things that run off mains voltage and I want to be sure that I have a proper connection from my chassis to earth ground. I've been reading a bit about proper grounding and have ...
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1answer
179 views

PE pin position

I have one question. I'm designing a PCB which is a sort of smart switch (so, basically, you have one 230V input and one 230V output, where the output and the input share two wires, N and PE, and the ...
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1answer
348 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 ...
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4answers
1k views

Is the link between the earth/chasis terminal and the utility transformer established through a dedicated wire or the soil?

I was following a tutorial on power supply transformers and at the very beginning I have encountered the following illustration: I added the names TG and HG for the LV transformer ground and the ...
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1answer
318 views

How to convert high voltage DC at low amps to low voltage DC or AC at high amps?

How to convert high voltage 500 volts DC at very low amps to lower voltage 12 volt DC or AC at high amps? Must I use an electrostatic motor or can I use an op amp? The reason I am posing this is a ...
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1answer
106 views

Why is earth at 0 V with respect to phase?

In 3 phase transmission lines we have different voltages depending on how we measure it. Phase to phase voltage is going to be 1.73 times more than phase to neutral. So far I understand everything ...
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0answers
48 views

LED lamp lighting with only 1 pin connected to earth which isn't connected to anything

Anyone can help figure this out? Yesterday, while connecting my LED lamp projector with an AC plug, I noticed when one of the 2 pins was connected to the earth pin of my AC extension cord, it would ...
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2answers
315 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 ...
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1answer
94 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 ...
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1answer
476 views

Ground and earth layers on PCB

I am designing a digital board with USB input and output. Shield of USB is connected to a chassis ground as per USB specs and connected to GND through a R and C in parallel USB power has a common ...
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2answers
328 views

Questions about earth grounding enclosures

A text mentions about the importance of connecting the earth wire to an instrument case/enclosure as follows: Instruments with ungrounded cases can become lethal devices in the event of ...
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1answer
272 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 ...
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0answers
81 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 ...
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1answer
94 views

Why is it dangerous for human being to touch one of contacts in AC wall outlet? [duplicate]

Let say we have some DC voltage source which produce some voltage which I will label as V. Let also say that we have some real bulb which is supposed to work when voltage V is applied across its ...
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10answers
37k 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 - ...
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0answers
540 views

Converting an ATX power supply to bench power supply.

I'm planning to convert an ATX power supply to a bench powersupply. It came to my knowledge that the DC ground is actually connected to earth. As I understand, this might become a major issue if I ...
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0answers
750 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 ...
2
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1answer
276 views

Modding a Class II switch mode power supply to have output dc- shorted to earth

As above, what are the disadvantages, risks and dangers involved in modding a class II switch mode power supply i.e. a double insulated laptop charger that is ungrounded to have the dc- output shorted ...