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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Can you touch a live wire without being shocked?
I understand many questions about electric shock from live wires and I apologise for adding to that list but after reading many of them I still have my concerns.
From what I have read from some of ...
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Grounding in power electronics
I'm designing a three-phase inverter and have been looking up information online with respect to grounding, which led me to a somewhat misapprehension.
In my system I firstly planned on separating the ...
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Charge leakage in home appliances [closed]
I have a basic question which isn't cleared through answers found.
We experience a slight electric shock in case of home appliances like fridge, oven etc. when we touch the metallic parts of those ...
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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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Why don't we use the Earth to transmit electricity?
Think about it, instead of transmitting electricity in 2 wires, we could only use one:
Why don't we just do it? I think they do it in three-phase transmission by connecting the neutral phase to the ...
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Amplifier chassis noise when not earth grounded
I build a kind of audio amplifier (it's actually a mixer). The problem is that the output gives a high frequency pitch noisy sound as soon as I touch the front panel which is part of the chassis. It ...
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Grounding Configuration Issue in Water Detection Circuit [closed]
I have this design for a circuit using a water detection sensor as shown below, focusing on applying our circuit to the highlighted red dashed box.
This image is from CIRCUITS DIY (https://www....
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Connecting GND to PE to improve touch sensors sensitivity
I am designing a smart light switch based on a microcontroller, with touch buttons. The design consists of two PCBs: a low voltage one for power (230 V) and an extra low voltage one for control (3.3 V ...
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What is the actual physics and reasoning for the “Ground plane” underneath a GPS patch antenna
From my very limited knowledge of EM, I believed that anything tied to earth can absorb radio waves, so if an antenna was to be placed above a ground plane, why does the ground plane not just absorb ...
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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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Analog signal input from device with different ground reference
I am somewhat new to the world of electronics, but am now trying to design my first more complex PCB. I am trying to make a set of battery powered earphones that take an input from a 3.5mm audio jack ...
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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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Effect of the placement of ground electrode on ECG
The above figure shows two ECG signals recorded after placing the positive electrode on the left palm and the negative electrode on the right palm. For the recording on the top column, the ground ...
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What is an ungrounded extension cord? Is it dangerous?
The definition of a grounded extension cord from this website is:
If you have a three-pronged extension cord, it is grounded.
Why is that so? What do we mean by "grounded" in this case?
My ...
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Can Y-Cap Remove DC Offset between Grounds?
I ask this question because I saw this in an Altium article:
In power systems, be careful how you use a capacitor to ground to ensure a consistent ground reference. Y-rated capacitors are best in ...
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EU appliance use on US circuit - grounding concerns
I've been reading through old posts about people wanting to use European kettles and other appliances on a 240v US circuit. Forget the 50hz/60hz frequency difference for resistive loads and universal ...
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Is it always given that ground has lower resistance than output even If output is far closer in an inverting nmos? [closed]
Currently I'm learning about MOSFETs (N-MOS and P-MOS) --basically how a transistor works. My question is why does the current always prefer the grounding output even though it is further away than ...
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Ground isolation in multichannel mixed-signal systems
There are some similar questions to mine but I have a few more specifications on top of them. Therefore, I am not 100% sure whether to ask as an iteration or present my own question on a clean slate. ...
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How to correctly ground/isolate a grounded enclosure type thermocouple?
My K-type thermocouple (grounded enclosure type) connected to MAX31855 adapter connected to Arduino Mega gives me faults every few readings. It's really, really bad. I've tried swapping thermocouples, ...
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Grounding Case to AC ground causing IO errors on PCB [closed]
I have a PCB that is powered by a AC/DC power supply. The PCB also has a aluminum heatsink attached to it. This setup functions normally when outside it’s case, as soon as the PCB and psu is mounted ...
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What is the relationship between Ground Potential Rise (GPR) and Source Voltage?
I am looking at the results for an earth grid study for a 50Hz substation.
Primary Voltage (Vp) = 11,000 V
Secondary Voltage (Vs) = 415 V
Secondary Fault Current (If)= 24 kA
Secondary Grid Current (...
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Neutral grounding resistor
How does neutral grounding resistor in power generation side, see and link up with grounding fault at the secondary side of a transformer?
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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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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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How should I layout an optocoupler isolation board with separate ground references and power supplies?
I am thinking about how to layout my opto-isolation board. It is used to protect pins on an FPGA, convert signals to RS-422 and then transmit via RJ-45.
I have seen some conflicting information about ...
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Should RVs electrical system be grounded to chassis?
I have an RV with both 12V and 230V systems. The 12V uses internal battery, while 230V is supplied from outside via plug. Should I connect these systems to metal frame of vehicle (minus of 12V or ...
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TT Earthing System [closed]
Ok guys I can't just understand a thing of the TT Earthing System, why on it the ground of the power cabin is connected to the neutral of the power cabin?
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Grounding in a new solar setup
Currently I'm building the electric part in my converted RV. I got all components that I need and want to start to wire them now. But my biggest lack of understanding is the grounding part.
The power ...
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How to measure if there is current between point A and B when source and grounding is unknown
I understand the headline makes little sense, so here is a clarification on what's going on.
I used thick steel rods to create a second floor (loft) in my apartment. Those steel rods are attached via ...
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Is it dangerous to use an ungrounded USB C charger to charge a laptop? [closed]
I have a laptop (with an aluminium case) that charges via USB C. The original power brick is 95W (but uses 60W charging in standard mode if I don't enable fast charging in software) and it has a ...
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Grounding in a balanced audio (XLR/Sub-D) switch?
I am currently working on a switch for XLR/Sub-D connections. However I am unsure as to how I have to handle grounding. Do I have to switch the ground for each channel or can they be bundled together?
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Why do TQFP and TFQN have different advice regarding analog ground?
This question is in reference to How to split Analog and Digital GND planes for a TQFN device.
For the PSoC3, the advice on how to separate the analog and digital ground is different depending on the ...
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My country does not have grounding system, How can I protect myself?
I live in Egypt where the neutral wire is grounded. The ground wire is not separated from the neutral wire. A wall outlet has two holes only (live and neutral), The third whole (ground) does not exist....
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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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AC Neutral and DC com
I have an AC signal that is isolated after a transformer and is an input to inverting summing op amp, and a DC circuit which supplies voltage as an offset to the same summing op amp.
The AC is 1 VAC,...
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Is this a safe way to use isolation transformer to mitigate neutral to ground voltage?
I work with a TN-S system wiring.
Main three phase transformer secondary is in Y configuration.
A single-phase lab instrument equipment installation requires less than 1 V for neutral to ground.
We ...
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How do I test grounding/lightning protection?
I manage IT for several clients in Central Florida, where we have quite a lot of lightning (the most in the U.S.). I have one client that has trouble keeping electronic devices alive. We have replaced ...
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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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Why grounding the circuit with external stuff, when a capacitor can do it?
I am examining my own radio circuit now for several days, so I included a pic:
When the circuit has been powered up, it works fine without fingers or equal grounding methods, for example by getting ...
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ESP32 USB Port Misadventure
I just had an incident where my laptop had two unresponsive ports and I am trying to figure out if it was my fault or a buggy driver.
Long story short I built a digital power meter for a linear PSU ...
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Car flasher circuit and grounding
My car flasher circuit can be simplified like so :
The factory flasher unit is a standard 2 pin that plugs in series with the switch and the load (indicator lights).
I'm attempting to make my own ...
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PCB Design multiple grounds with different ICs
I want to make a board that have differents ICs and looking at the datasheets, I can see different grounds connected in different ways and I'm not so sure about how to connect them/which ground should ...
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Adding second relay coil in parallel with the first one creates buzzing in the first
In my cargo trailer/camper conversion, I used a DPDP 120 VAC coil relay (JQX-62F-2X 80 Amp) to connect the breaker panel to shore power or to an inverter (for battery power source). The coil is ...
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Bouncing ground and voltage spikes (power supply and grounding issues)
I am having an issue with voltage spikes and bouncing ground in my circuit.
Circuit is powered with 12V DC power supply. I am have two DC-DC converters:
4V output (power module based on TPS54331) 3A ...
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Should the threaded insert for an M.2 mounting screw be grounded?
A PCB that I am working on has a non-plated hole into which a press-fit threaded insert is installed to provide the mounting point for an M.2 SSD. As such, when the SSD is installed, the mounting ...
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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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Grounding balanced secondary isolation transformer for EMI suppression
simulate this circuit – Schematic created using CircuitLab
Which is the best secondary connection to clean the main line power from EMI, line noise and HF harmonics by using an isolation 1:1 ...
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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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