Questions tagged [grounding]
Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.
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PCB inside metal chassis. Is chassis ground required?
I have a project that has a PCB housed in a metal enclosure. The PCB is powered by a USB-C connector. Power input is 20 V DC @ 4 A max. Power is sourced from an isolated AC/DC wall wart adapter. The ...
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Can someone explain this grounding phenomenon?
I went into a conversation with an electrical engineer. Here is what was on the table:
Me: How do you connect a two-phase load to a three-phase delta load? If the loads were Y-connected, then you ...
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How to remove noise in ADC voltage measurement?
I want to measure the open circuit voltage of a battery cell (differential reading, that is A0-A1). In order to do that, I am using an industrial PLC based in Arduino Mega and a cheap but accurate ADC ...
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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 suppress ...
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Chassis / Shielding Grounding on Mobile Robot
I am working on a project building a mobile robot.
I realized that the robot will have a buildup static when it is running because I can feel it when I touch it (uncomfortable spark).
The robot is ...
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IEC 61000-4-5 2 kV chassis ground to neutral and live surge DC
I need guidance for passing the IEC 61000-4-5, 2 kV Surge test from the AC ground (protective earth, PE) to the neutral and live wires. This grounding techniques may be a bit different that passing ...
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What grounding should I use for this capacitively coupled input?
I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this:
In this case the ...
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Zener diode for overvoltage protection and earthing
I am designing a small circuit where the goal is to measure the current. The CT measures the current, which passes through a shunt resistor. The ADC convert the signal so it can be further processed.
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Can I use the concentric conductor of NYCW 95/50 as a ground wire?
Must one buy a separate ground cable in a TN-S network for earthing or can the concentric conductor be used for earthing purposes?
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Why are three pronged plugs more preferred than two pronged ones?
I get that three pronged wires have the earthing wire and all but unless we plug it incorrectly or something along those lines, two prongs work just fine right?
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Multicard System Grounding
I am building a system with multiple PCB cards.
The whole system has a Chassis Ground; connected to a main Power Supply reference.
All cards will be powered in reference to Chassis Ground.
Each ...
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Do neutral wires go back to transformer via ground?
I have heard that transformer connects to house only via phase(s) - neutral from house is actually grounded, as well as transformers and they connect via earth. Is this true? What is resistance of ...
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EMC filter for two wire flyback SMPS
I am designing an EMC filter of a two wire (no earth connection) flyback SMPS.
In the EMC filter, AC line usually has two Y capacitors after common mode choke connecting earth (PE). Since this SMPS ...
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With modern connectors, is the metal shell used as a conductor?
Does the metal shell of a connector, such as USB and HDMI, serve a conducting purpose? The metal shell of my TV's HDMI terminal is corroded. Should I make effort to have it contacting and conducting ...
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Why does AS3001:2008 Transportable Structures explicitly deny a separate earthing electrode?
As the title says, if a generator is providing a TNS earthing system connected to a transportable structure through a detachable connection, why does AS3001 state:
Isolation of the protective earth ...
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Grounding resistance dependency on distance
I am currently learning about grounding in electrical installations and there is something that intuitively doesn't really make sense to me. It is related to the resistance measured between two ...
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How can I accurately and precisely measure current in a 110 VAC circuit with a 1 kΩ-50 kΩ load using an oscilloscope?
I need to measure the electrical resistance of a volume of ground.
To do this I need to cause a current to flow between two metal electrodes pushed into the soil (let's call them the "current&...
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Why does my RCCB keeps tripping every time I want to start a 3-phase motor?
I am working on a filtration pump using a simple start-stop button for the 3 phase motor Electrical diagram is attached below. Most of the main components are from Schneider. The "Pump Run" ...
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Cost-Effective yet reliable earth detection circuit with <100µA current draw
I'm working on a cost-effective circuit to detect the presence of an earth ground connection in a 230V AC mains line (at 50Hz). One of the key design constraints is to keep the current draw less than ...
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Alternative to P-JFET design to ground load in case of low supply voltage
I'm working on a device and I'm encountering some problems. Basically the device pushes varying currents through a variable load using a current source and an H-bridge. For safety purposes, the load ...
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Grounding and Ground Pour
I’m trying to build my first audio amplifier and need some help and advice on this topic.
It will be a simple 100 W audio amplifier, powered by +35 VDC and -35 VDC. There will be local power ...
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What is counterpoise?
I was reading about the radio telescope - Murchison Widefield Array (MWA) situated in western Australia. Antennas of this telescope are quite unique and different from usual dish radio telescope. In ...
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Digital inputs for analog switches (analog or digital ground?)
I'm using an analog switch, ADG1434 to switch some filter components in a circuit. My question is about general best practice for the digital signals going to analog switches. The switch is dual ...
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How does this soldering iron sleep sensor circuit work?
I recently built a unisolder soldering station and am struggling to understand how the detection of the soldering iron within its holder is implemented. The unisolder board itself provides a 3-pin ...
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Connecting grounding mat to socket
I bought an anti static mat that came with a banana plug connector and an alligator clip that can be mounted on the banana plug. Can I connect the banana plug connector directly into a US ground ...
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Protecting equipment submerged in water against earth fault - RCCB vs MCB
I would appreciate help understanding the difference between an RCCB and MCB in the context of the situation I'm sharing below.
I have a mini fountain pump in my pond which doesn't have any earth pin (...
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Adding a Chassis Ground at the Midpoint of a PCB
The PCB I designed is 6-layer. I will create a chassis ground in the form of a frame surrounding the mounting holes and add a Y capacitor between and to the signal GND. And I will surround this ...
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Stack up and inner layers of shield structure used in RF PCBs
In such RF PCBs, it can be easily seen that the chassis ground passes through the middle of the PCB. My question is, is the chassis ground directly connected with the signal ground in such RF PCBs? I ...
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Detecting a connection to protective earth from an isolated circuit
I recently built a unisolder soldering station. One of its features is a sleep mode based on whether or not the soldering iron handle is present in its holder. A SLEEP pin is provided that's weakly ...
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Different Ground reference
I plan on making my own BMS for a 12S battery pack, and I found TI's TIDA BMS board and decided to use it as a reference to gain some understanding on how to develop safety circuit for the board. ...
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Can COM and earth be connected thorough the PCB ground pin?
I'm using an AC/DC switching supply (Meanwell PD-45) with the following schematics:
The Frame Ground (FG) is connected to the metal chassis of my device with a screw. The output of the switching ...
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Earth ground and DC
If I understand correctly, a DC circuit powered by a simple battery would not be affected in any way by an earth ground. By earth ground, I mean a copper wire attached to the ground through a long rod ...
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Separate ESD traces/layer?
I am designing a keyboard that connects through USB-C to a computer and has Aluminum chassis. I am dealing with ESD protection for the enclosure itself and some exposed components (that have a "...
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Inrush problem while using a isolated DC lab power supply
I'm puzzled by an issue I've been observing during my testing of H-bridge buck converter.
I'm using 2 lab bench DC PSU such as E3630 (Keysigh)t to supply ISOLATED 5V to a driver.
When I power up the ...
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Portable AC power source earthing?
I have an 12V to 230V inverter in my car but get confused about ground it. The inverter is centre-tapped, means live-earth voltage is +115V, neutral-earth voltage is -115V, this gives an L-N voltage ...
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Will I see a sine wave if I connect one oscilloscope terminal to the phase and another to the earth?
I have a doubt regarding a thought experiment I am conducting since I lack access to proper grounding at both my workplace and my house.
The experiment involves the following setup:
I intend to ...
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Split or not split the ground plane in a low-noise design?
For low-noise design, many component datasheets suggest dividing the ground plane into AGND and DGND and linking them with a star connection.
But my ten years of experience in EMC have shown me that ...
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Grounding and shielding between isolated devices
I have a battery operated micro controller with a hall sensor, mounted on a motorbike. The hall sensor has a shielded cable to counteract spark plug induced EMI. By default, the entire setup is ...
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How does chassis ground apply in nonmetallic enclosures?
I am working on a PCB that uses a chassis ground, but I am not able to make a metal enclosure for it. I was wondering if you can use enclosures that are not made of metal for chassis ground and how it ...
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Mesh ground advantage over single rod ground
In high voltage laboratories, how do mesh grounds perform better than that of single rods?
Does frequency play a role here ?
Which one is more beneficial, using multiple single rods in lab for ...
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Earthing in plastic enclosure
I'm working on a device with a plastic enclosure. It has a typical AC receptacle, a touchscreen, and some rubber/plastic buttons, everything else the user may touch is non-conductive plastic case. My ...
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Chassis grounding for multiple daisy-chained units
I'm designing a system that provides power/ethernet/serial for up to 5 daisychained units. All of the boxes will be metal and my initial plan is to run power and signal ground through the 14 pin ...
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How to test or substitute a frame ground point in a modern, small-motor vehicle? [closed]
I have a ATV that I am trying to install a horn and light set it. Lights worked out fine but the horn worked for a bit then stopped, and now a replacement horn keeps blowing fuses. I checked and the ...
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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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Effects of Improper Grounding on Common Mode Noise
In a DC power system like the one shown below in the diagram, a resistor is placed between the return wire and chassis to limit fault currents in the scenario where there is a high side to chassis ...
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Signals has a different ground from power ground in multiplexer IC
I am looking at this multiplexer CD4051BE. Below is the pinout of the chip. I power the chip with 12V and feed PWM signals into the channel pins of the chip. However, the PWM signals have their own ...
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How does earthing work when earth is dry?
Earthing is meant to provide reliable contact of an electric appliance to earth so that if there's an insulation fault current goes into earth instead of through a person's body. This requires ...
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Replacing keyboard USB-A cable with a USB-C female connector
I have a keyboard with a long non-detachable USB-A cable that I would like to replace with a USB-C female connector. My end goal is being able to detach the keyboard like a portable device and use it ...
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Earth and neutral voltage detection
Can someone suggest me a circuit to detect the earth to neutral voltage? I would like to trip a relay coil using a microcontroller if the earth to neutral voltage exceeds 3 V.
There are RCB and RCBO ...
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Pump control with a Raspberry Pi
Pump control Raspberry Pi
I am planning to control a small water pump with my Raspberry Pi. The 24V pump needs quite a bit of current (~1A) so thats why I got a transistor output card with an I2C ...
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