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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60 views

Connection between Chassis GND and Circuit GND for ESD/transients

In Henry Ott's Book, Electromagnetic Compatibility 2009, it has the following: Figure 14-14 seem to be in conflict with Figure 3-24 and 15-15. The circuit GND is connected through a TVS to chassis ...
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1answer
200 views

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 ...
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2answers
116 views

why is it bad if a coax cable (used for antenna cable) has multiple paths to ground?

I have an Internet modem/router device connected to a 20 foot LMR400 coaxial cable which uses N-to-N type connectors to connect to a 10 foot LMR400 cable, which is then connected into an ...
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2answers
74 views

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 ...
2
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2answers
57 views

joining signal and power grounds together

I've read some questions and answers here about making 2 separate grounds - one for signal, second one for power. Every question was about the case where the grounds meet each other in one point. I ...
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3answers
511 views

Line to ground faults

I am having a trouble understanding the concept of line to ground faults,and ground in general. In this simple single phase circuit, does current reach the load and the circuit operates normally? ...
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0answers
21 views

TN-S system neutral point earth resistance

According to many sources on the internet, a secondary neutral earth resistor is added at the distribution stations (transformers) to reduce the earth fault current. My question is when using a TN-S ...
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3answers
2k views

Can a generator give me shock?

Can an isolated AC system like a generator which is not system grounded will be able to give me a shock if I touch it one wire? I guess it should not, because then there would not be a path back to ...
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2answers
26 views

Grounding Distribution Panel Earth Busbar using 'split' cable?

I'm pre-wiring a distribution panel for future installation into my retirement home in the Philippines. I've read that grounding the DP to an earth rod or equivalent should require a minimum 6AWG/...
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3answers
2k views

Why would this microphone only work while touching the volume control?

My son bought this USB microphone for his computer. It only works if you keep your hand on the volume knob. I assume this is a grounding problem. I took it apart. It looks like the copper wire ...
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2answers
143 views

Is this internal rearrangement of charges in a circuit a current and is this current different from the “normal” current of the circuit?

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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1answer
61 views

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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2answers
73 views

RCA shocking myste [closed]

I got a zap from the shield of a RCA cable from my TV to DVD player(both TV and DVD do not have a ground terminal on the outlet plug). I measured the metal case to ground and I got a reading of 50V. ...
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2answers
72 views

Schematic representation of AGND and DGND in a shared ground plane design

I've seen many questions asking how to connect AGND and DGND in a schematic, and the usual answer is to use some kind of net tie component with a physical footprint (and to approve the resulting ...
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0answers
47 views

Is the ground resistance meter indispensable when earthing your home?

I'm Brazilian and I need to ground my house, especially because of some expensive equipment I don't want to use without proper protection. By "grounding my house" I mean: provide an alternative path ...
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2answers
96 views

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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0answers
45 views

Non Inverting op-amp grounding

I have this LM358 op amp as a non inverting amplifier used for high side current control. I feed this ic with 5v on pin 8 and ground is pin 4. Pin 2 and 3 are the inverting and non inverting inputs. ...
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2answers
236 views

“Creating” a ground pin for my laptop

I am building a sensor using an Arduino connected to a laptop; I noticed that the readout is much more noisy when I use a non-grounded laptop (either running on battery or connected to a power socket ...
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2answers
4k views

PCB Crystal Layout

I'm designing PCB with 16MHz crystal for ATMega328p. Right now that is my layout. VIAs ring around edge of board is to stop EMI radiation from edges. There is no Ground plane under capacitors and ...
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2answers
57 views

YM3012 Analog Ground

I am trying to build a circuit using Yamaha Sound chip YM2151 with Yamaha DAC YM3012. This is my first attempt in doing anything with analog signals, so there is much to learn! While reading a ...
4
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1answer
730 views

Why did this arduino burn out? SilentStepStick (TMC2130) stepper at 24V

I'm new to electronics. Attempting to bench-test a SilentStepStick stepper driver board, (based on a TMC2130) Using: Arduino Uno, a SilentStepStick driver board, a 0.6A stepper motor, and waterott ...
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0answers
28 views

Making an external Power supply from a internal power supply

I have a old Drum Maschine and want to remove the internal power supply to make it external. The transformer is grounded to the chassis of the drum Maschine ..... If I make an external How should I ...
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1answer
30 views

Earthing when Two Objects need to be Earthed

I recently bought a ‘Push To WAIT’ unit from the Highways Agency. It has a transformer that converts 240V to 48V which goes to the unit. The trouble is, the transformer and the Push to wait Unit both ...
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1answer
92 views

How can I accurately and precisely measure current in a 110V AC circuit, with a 1kohm-50kohm 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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2answers
74 views

Headset microphone is noisy, but touching speaker wires removes the noise

I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. As I ...
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1answer
19 views

How to Ground DC 12V Battery, Charge Controller and Solar Panel?

In my shed, i've got a 12V 120AH leisure battery and 30A MPPT solar charge controller, on the shed roof there are three 100w 12V solar panels. I wonder if I need to ground any of those? If yes what ...
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2answers
108 views

How to connect the GND with the metal case of the robot

I have a PCB design inside a metal case of the robot. The robot is mobile, it moves on wheels. The problem is how to connect the GND with the metal case of the robot. Direct connection is not safe, ...
6
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1answer
224 views

Can somebody please explain to me the principle of a T-T Earthing system?

How are the transformer, consumer's side and the generator earthed in a T-T Earthing system? I seem to understand that the generator and its frame should be earthed separately; The neutral of the ...
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1answer
51 views

Why makes ground “ground”? [duplicate]

We all know that birds don't get electrocuted while standing on a single power line, but if the bird touched the ground while holding the power line, it will die instantly. One thing that riddles me ...
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0answers
58 views

Is it really necessary to ground the metal can on crystal oscillators?

I am modifying a KOSS portable dvd player into a portable raspberry pi computer and have noticed that they grounded the can of the crystal that feeds their microcontroller. I am curious if there is an ...
4
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1answer
766 views

ESD Protection on Un-grounded Chasis

I am designing a product solution which needs a 240V AC to 12V DC. I am getting that done with one of those standard laptop chargers from a reliable OEM(with necessary certifications) which looks like ...
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1answer
170 views

Earth& neutral voltage detection

Can someone suggest me circuit to detect the earth to neutral voltage. I would like to trip relay coil using microcontroller if earth to neutral voltage exceeds 3v. There are device RCB and RCBO ...
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4answers
175 views

What is happening to the flow of electricity in a magneto when you shut off power in a lawn mower or plane?

I just learnt, mostly by reading about something else, that magnetos are the primary sources of ignition in planes and other types of engines. The article I read said that it was important that a P-...
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1answer
61 views

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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1answer
99 views

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) = 11,000V Secondary Voltage (Vs) = 415V Secondary Fault Current (If)= 24kA Secondary Grid Current (...
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2answers
2k views

How are airplanes grounded?

What are all the wire shields grounded to on a system that has no contact with earth, like an airplane? I found this document that says all shields and chassis and other grounds should be connected at ...
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3answers
90 views

Signal return path between circuits with separate full-bridge rectifiers

Edit: I think I've figured out WHY this is happening (see my answer below), but I still would love to hear ways to mitigate this issue. I've got two microcontrollers that are powered by the same dc ...
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0answers
26 views

BBB Grounding Issue

I'm having some issues with my BBB and I believe it is a grounding issues. I'm currently using a 5V power supply with the barrel jack to power the unit. However, I believe there are times when the ...
2
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1answer
75 views

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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2answers
91 views

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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1answer
54 views

Replacing a coffee maker switch with a relay - grounding issue

I'm trying to replace a coffee maker's switch with a relay. Problem is, I'm not sure how to handle the ground wires going into the switch. Looks like the wires are coming from the power supply and ...
5
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1answer
128 views

How to safely ground a device plugged into an isolation transformer

I am working on an old turntable power supply on my workbench. I have acquired a 1:1 bench isolation transformer to increase safety while doing this. It seems to be a well known "issue" with at least ...
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1answer
123 views

Running a long 120VAC line without a neutral

Source is a home 120/240VAC with pole transformer. I want to direct bury a 500 foot 120V line to run some battery chargers and dont need more than 10 amps. Why cant I only run a single large ...
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2answers
76 views

Is it safe to power a monitor without grounding? [closed]

After viewing https://superuser.com/questions/461898/earthing-is-it-important-for-laptops and learning about double insulation, it seems that an appliance is safe as long as there is no way that the ...
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1answer
105 views

What is this grounding connector for devices called?

I need to find the grounding connector/socket (male) like in the photo for my device, but cannot find what it is exactly called or if it is rather something custom-made.
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1answer
100 views

Measuring mains voltage with DMM and only one probe gives 100+ volts!

While trying to find out what is going on here , when measuring the mains voltage with a multimeter by connecting the red probe to the line and leaving the black (com) one laying in the floor after ...
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1answer
169 views

Why this LED strip is emitting light if any driver output wire alone is connected to either one of its terminals but only near the floor?

I was experimenting with LEDs, when I encountered the following strange behavior: 5 LEDs on a strip simultaneously emit light when I connect eny output wire from a mean well +36V 700mA constant ...
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2answers
501 views

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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0answers
54 views

What could be the source of capacitive coupling in these SMPS?

I have bought two of these cheap laptop power supplies for an audio amplifier I was building. They work, but with a serious problem: They give mild to strong shocks to anybody touching the ground (or ...
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1answer
154 views

Shielded Ethernet Cables in Office Buildings - Ground Loops?

I have a question related to shielding and grounding of ethernet cabling in industrial environments, offices and datacentres. What I assumed as correct so far (please correct me if I’m wrong): In ...

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