Questions tagged [earth]
The earth tag has no usage guidance.
205 questions
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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 ...
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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 ...
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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 ...
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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 ...
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DC power supply 10V AC between terminals and mains earth
My DC power supply shows 10V AC between earth and one of the terminals. How can I fix this, and is it safe to probe circuits with an oscilloscope, that are powered by it? The PSU ground terminal is ...
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How to test if a domestic 3 phase power company meter is reading wrong?
BACKGROUND:
Domestic 3 phase 220VAC supply in Thailand.
Power company meter is 4 wire GE 3 phase 15A/45A.
Massive power bills when mains breakers were turned off (back in home country for 9 months ...
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What are default rules to connect cold part to protective ground?
I have a device, what have hot and cold part. I want to protect cold circuit what contains user interface from HV leaks or breakouts.
In professional PCB im frequently seen cold-common connected to ...
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When do I need a protective earth?
My company is developing a new handheld power tool. We are a rather inexperienced team and I am not a electrical engineer but I am concerned about the safety of our customers. We are located in ...
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Safest way to ground a metal enclosure
I am currently building a nixie clock with some high frequency components (GPS) and I am planning on putting the clock in a metal enclosure. The highest voltage used in the clock is approximately ...
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ESD protection on floating circuit - Capacitor from circuit ground to earth?
I'm not very familiar with proper ESD protection and wondering about the correct implementation of a TVS diode to protect an input of an isolated circuit.
In the case of an ESD event into the ...
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Do automobile DC systems sport a device synonymous to the electrical infrastructure that we call Earth Ground wiring in standard household AC systems?
In automobile DC circuits, the chassis is typically connected to the negative battery terminal and, thus, the chassis provides the infrastructure for closing the DC circuit. In diagrams, this is often ...
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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 ...
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Connecting GND on secondary side to protective ground
We have a battery powered equipment which mainly consists of a temperature sensor connected to a microcontroller via a filter. In addition to battery power we have now added the possibility to use a ...
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Cat 6 STP 4x2x23AWG 500MHz cable earthing without using connectors
Regarding the following wire, I will use this to connect some signal wires between sensors and microcontroller, the only problem being that I will not use any dedicated connectors. Instead, I will be ...
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current path into the ground?
Considering a monopolar HVDC system, with the ground as the return path.
I was wondering if the current path is physically speaking like the red one or the green one in the picture? I think it is like ...
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Electronic earth
I just want to know basic information about it and why it is not to be connected with main ring of electrical plant.
If there are any references for it i will be grateful.
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100VAC between concrete floor and outlet ground
I have been tinkering as an enthusiastic hobbyist in my garage 'lab' for about a year. It's an old rented house in Sydney, Australia. Puzzled by several odd small shocks and confusion as to why my ...
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What happens if the ground of a PCB touches the earth?
I know that if an object is significantly more/less charged than another object and goes near it, an ESD can appear and then both objects would become balanced. This can happen when a human touches ...
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Can I connect DC GND to AC earth? If so, what is the purpose?
I am trying to use the circuit shown below in the picture.
In the circuit, from the AC supply, the PE is connected with the ground symbol. I assumed I need to connect PE (protective earth) with the DC ...
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How do I properly earth this voltage regulator that only has a two-prong plug?
I have this automatic voltage regulator (AVR) that powers some audio equipment.
The problem is that it only comes with a two-prong plug so it isn't properly earthed.
This means that the people who ...
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Is there any alternative to the use of a ground wire? [closed]
Is there anything that can be used as an alternative to a traditional grounding pole that is buried in the ground?
Is it possible to use a lightbulb, a series of lightbulbs, or maybe an inductor in ...
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Is ground connection in home electrical system really necessary?
I know that the answer to my question is "Yes, it is!". The ground connection is needed to avoid a person touching a metallic part of faulty equipment to be electrically shocked. So the ...
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How the (earth) ground works?
I have developed bad intuition and a lot of misunderstanding about how grounding works.
For example, in this thread: Will a battery connected to the Earth eventually deplete?, the accepted answer is ...
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Non-contact voltage tester beeping near anything metal in my house?
Ok this is my first post so apologies if this is inappropriate but I need some solid opinions from guys who know about house earthing
So me and my dad just moved into an old house and I was walking ...
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True RMS earth leakage relay
The relay shown below [Link] claims to trip in less than 25 ms to fault currents that are 5 x greater than the set trip current. Also the minimum time settings are inst (what time is "inst") ...
user115094
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Where exactly earth current flows-SMPS/DC-DC and DC-AC
Ashamed to ask this question after having lot of experience in Converter designs. i always heard and learnt from Sr. Mentors that For better EMI performance we need to give path for conducted noise(...
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Why does this connection not become a low impedance between Positive (Isolated system) and Ground (Earth)?
I was going through a lecture regarding oscilloscope grounding methods and saw this image.
Assume I have the isolated widget powered by an external battery. Now, I am going to measure the signals ...
user220456
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Adding Ground or Earth to the shielded cable
I am using 8 core shielded cable to transfer I2C signal along with analog sensor data. We have connected earth to the shied cable, we have option to connect DC ground also. Everywhere I have read ...
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Isolation transformer = floating ac inverter [closed]
Its said that, in AC power system at power station neutral and ground connected together because of this reason we get electrical shock, as neutral and standing ground are same.
Assume, if I power a ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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