Questions tagged [grounding]
Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.
1,180
questions
0
votes
1
answer
44
views
Question on orientation [closed]
I have a question on the orientation of this part.
My question is:
I have a 3-phase, 4-wire system. R,Y, B & Neutral.
So, I have the above 4-wires passing through the hole(core) of the transformer ...
- 787
5
votes
1
answer
1k
views
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 ...
- 33.1k
0
votes
0
answers
36
views
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 ...
- 13
2
votes
3
answers
161
views
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 ...
- 75
0
votes
2
answers
80
views
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.
...
- 161
0
votes
1
answer
39
views
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?
- 37
2
votes
2
answers
1k
views
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?
0
votes
1
answer
52
views
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 ...
0
votes
2
answers
107
views
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 ...
- 753
5
votes
3
answers
513
views
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 ...
- 59
3
votes
1
answer
34
views
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 ...
- 55
3
votes
2
answers
725
views
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" ...
6
votes
2
answers
143
views
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 ...
- 61
0
votes
0
answers
50
views
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 ...
- 1
0
votes
1
answer
37
views
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 ...
- 511
2
votes
0
answers
88
views
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 ...
- 511
0
votes
1
answer
48
views
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. ...
- 113
3
votes
2
answers
222
views
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 ...
- 31
0
votes
3
answers
81
views
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 ...
- 1,133
4
votes
3
answers
106
views
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 "...
- 143
1
vote
1
answer
63
views
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 ...
0
votes
2
answers
116
views
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 ...
- 862
6
votes
2
answers
121
views
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 ...
- 673
2
votes
3
answers
659
views
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 ...
- 179
3
votes
3
answers
187
views
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 ...
- 466
2
votes
1
answer
42
views
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 ...
- 139
0
votes
1
answer
51
views
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 ...
0
votes
1
answer
65
views
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 ...
- 51
0
votes
1
answer
32
views
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 ...
- 115
0
votes
1
answer
36
views
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 ...
- 1
1
vote
0
answers
40
views
What is the safest and most noise free grounding method floating or non-floating for audio plugs & circuits on 2U aluminum case and SMPS
I have read countless documents and viewed schematics on this subject but am still confused when it comes to physically building a box and running all of the wires correctly and safely.
I drew a very ...
- 111
0
votes
0
answers
27
views
Grounding & USB-C To HDMI Adapter
I've a MacBook that comes with a 2-prong 30 watt USB-C charger. Since it's a 2-prong charger, there's no ground terminal.
Now, suppose I connect this MacBook to an external monitor, and the external ...
- 1
2
votes
2
answers
112
views
Different grounds for sensor power and reading
First of all, I'm pretty new in this area of electronic circuit design so I might end up saying something pretty dumb in the course of my question. Also, English is not my native language, so sorry ...
0
votes
0
answers
34
views
Grounding Circuit with two Power Supplies Wired Together
I am trying to operate an x-ray tube that requires a high-voltage supply and a lower-voltage filament supply.
The high voltage supply consists of a Cockcroft–Walton voltage multiplier, and the ...
- 293
0
votes
2
answers
117
views
Working of this circuit - Diodes
I have the below circuit where a single Phase AC input is given between Line and neutral.
But I have two questions:
Can someone tell me the working of this circuit and at what time the WEILD_DET pin ...
- 787
0
votes
0
answers
40
views
Is USB 2.0 Shield Wiring Necessary For a Power Only Connection? (Power Supply to Raspberry Pi)
I am building a low ripple power supply for my Raspberry Pi Zero 2W + DAC combo.
The output of my power supply will be a female USB A 2.0 connector, using a regular USB A to Micro B cable to power my ...
0
votes
0
answers
31
views
What is the minimum distance between medium voltage electrode and low v earthing electrode
And what is the best way for grounding the koisk which have medium section transformer and lv section. The required earthing system is TNS system that requires neutral and pe in the same electrode
1
vote
0
answers
105
views
How to properly ground an old turntable and tonearm?
I have a specific question about proper grounding of an old turntable that hopefully has some general merit for such older devices.
This question came up while I was inspecting the wiring of the ...
- 147
3
votes
2
answers
473
views
Why does it work to connect between phase and ground, if the electrical circuit is not completed or closed?
Maybe it's a silly question about electrical installations.
I'm not talking about rules, protections or if it is correct to do what I'm going to describe.
I just want to understand why it works.
For ...
- 391
0
votes
1
answer
81
views
Grounding a Metal Roof
I have a steel roofed home that is powered from a solar system 100m away. The only earth is that on the incoming power cable. (220V 50Hz)
Should I earth/ground my roof and if so to an independent ...
- 1
0
votes
0
answers
47
views
Not working IEEE 802.3af PoE-PD Interface Controller (NCP1091)
For a hobby project, I am developing a PoE-powered PCB. At the moment, I have the following schematic and pcb layout designed.
When testing the PCB, I just can't get the PoE to work. My Switch (...
- 1
1
vote
1
answer
34
views
Managing seperate ground paths for a driver
I'm trying to design an add-on board for a single board computer, similar to an Arduino shield or a rPi hat. Among other things, the board will control a couple of inductive loads through a ULN2003A ...
4
votes
1
answer
352
views
Why does my TS101 soldering iron turn on LEDs upon contact?
An LED on my board turn on and stays on when I touch it with my soldering iron and it's freaking me out. This happens even though the board is just sitting on my (wooden) desk and not connected to ...
0
votes
1
answer
127
views
Shall I connect '-' terminal of power supply to earth GND (green terminal)?
Attached is the current lab setup for my chip testing. The green square represents the main PCB board, and little blue square represents the chip. The chip needs separate VDD voltage for its analog ...
- 577
0
votes
1
answer
21
views
Trying to ground ADC0832 properly
I trying to use ADC0832 for voltage and current measurement on Raspberry Pi 4, previously I was using MCP3008 for that purpose. But I want to simplify the system.
So, I am trying to implement ADC0832, ...
3
votes
2
answers
151
views
Density of braid shielding
Does the shielding braid density depend on frequency range to provide good cable shielding? I have read that braiding works well for low frequency but that at high frequency the effectiveness ...
- 31
1
vote
2
answers
55
views
PSU - grounding - charging AGM batteries
I'm using a Flatpack2HE frontend 3000 W 48 V PSU for charging an AGM battery bank from a 240V AC generator (or at least that's the plan).
It's an off grid solar power system in the UK, generator is ...
- 11
1
vote
3
answers
288
views
What is the best practice to connect isolated CANBUS transceiver with non-isolated CANBUS transceiver on the same CANBUS network?
CAN Background
According to some places, CAN transceivers do not need GND connections since the line is differential. After long research and understanding how the CAN transceiver works, GND is ...
- 174
0
votes
0
answers
95
views
Preventing servo motor and drive ground loops in shielding
I have an XYZ CNC machine that has an electrical panel with industrial servo drives.
I recently had an EMI problem on the encoder cable for one of the motors, and tried to diagnose the problem.
The ...
- 25
1
vote
3
answers
123
views
How to fix the shock I was getting from my 3D printer?
Our house do not have proper grounding, only hot and neutral wires are present. Now, every time I touch the chassis of my 3D printer it shocks me.
I tested the ac voltage between the chassis and the ...
- 11