Questions tagged [earth]
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37
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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 ...
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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 ...
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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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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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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? ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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111
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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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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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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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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 ...
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MOV failures in DC
We are facing an issue in our protection circuitry. For the below DC design MOV between Earth is getting damaged in the site.
MOV 2 & MOV 3 in the circuit is failing in the site.
System is ...
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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 ...
- 10k
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Earth Loop Impedance Meters; Difference between 3 lead (L-N-E) and 2 lead (L-N/E)?
In our company we use various different brands / models of ELI meters. Some have three leads, live, neutral and earth, and some have only two leads, one live and one neutral/earth combined.
Can ...
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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 ...
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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. ...
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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 ...
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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 ...
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183
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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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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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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 ...
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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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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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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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469
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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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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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54
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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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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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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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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 ...
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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.
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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 ...
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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 ...
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