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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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682 views

Connecting `signal ground` to `earth`: should I?

We usually have 3 wires in the outlet: L (line), N (neutral) and PE (protection earth). It is pretty common that the N is tight to PE in the distribution board or power plant. If the device have ...
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3answers
624 views

How to ground a 2 prong plug electronic?

I am installing a strip of 110v led strip outdoors and placing them on an aluminum channel. I will be cutting the strip, waterproofing them and placing different sections of the strip throughout the ...
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1answer
55 views

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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1answer
309 views

Joining ground between ESP32 and LED Strip from single power supply

I'm driving an APA102 LED strip from an ESP32. Both are powered from a single 12V power supply that is brought down to 5V using a high-current (10A) buck converter. This works fine when I join the ...
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1answer
186 views

Grounding a soldering iron and it's enclosure

So, I assembled a soldering iron kit and put the control unit in an aluminum enclosure and intend to use a Mean Well SP-240 24V power supply with it. I just wanted to verify a couple of things. The ...
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1answer
85 views

how to handle GND reference in Arduino connected to separate electronics?

I am building a system that consists of an Arduino-type device, connected to a host computer via USB, which interfaces with some additional electronics which are driven off an isolated switching DC ...
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2answers
1k views

DMX: What should I do with ground and shield?

I'm currently developing a DMX interface (master interface) with USB and Ethernet connections. The power for my device I'm retrieving from the 5V of the USB connector. The shield of the USB connector ...
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2answers
89 views

Properly earth grounding benchtop supply

A DC benchtop supply is usually ground free, i.e. the negative output is floating wrt earth ground. I used to use HP E3630A which has an additional "Earth Ground" pin and to which I shorted the "-" ...
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1answer
164 views

Do we connect the ground rails on both sides of a SMPS? [closed]

Is there any reason for, or not for, connecting the ground of the high voltage DC line with the ground of the low voltage DC rail(s) across the transformer in a switch mode power supply (SMPS)? I've ...
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3answers
957 views

Can lack of grounding affect appliances?

Grounding is done because if charge leaks the external metal body of the appliance risking the life of anyone who touches it. But, does this charge leakage, of itself, affect the internal workings of ...
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3answers
167 views

What is the meaning of “ground” and “-V” in a simple push-pull circuit?

In this simple "push-pull" circuit, there are +V, -V and ground connections. up until now, i always considered ground to be the minus side of the battery. but that is also the way i understand -V, so ...
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2answers
148 views

Balanced star 3ph system

I have balanced star three phase generator 380V with junction point is connected to ground And current through from junction point to ground is I0=0 for that clearly say it is balanced system when i ...
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1answer
366 views

Negative Wires for Parallel LED Strips

I'm working on a large scale LED project and I have a power supply question. I am using multiple power supply units and I'd like to wire a large amount of strips in parallel and control them with a ...
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0answers
566 views

Grounding Neutral Off Grid Solar

Is it recommended to ground the neutral line in an off grid solar system? A nonisolated inverter would be by definition wired this way, right? I believe that in home electrical systems neutral is ...
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2answers
89 views

What/How many devices to put in one local ground net?

I feel that this is a stupid question but I have really no idea how to answer it. Looking at this answer first part and of course the other answer it's pointing to, I understand that high frequency ...
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1answer
243 views

SiPM Array, High Speed Layout

I'm working on an prototype array of Silicon Photomultipliers using the Sensl MicroFJ-60035 TSV device. It's a small 6 mm by 6 mm square-shaped BGA photomultiplier. Think of a 6x6 BGA array with the ...
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1answer
51 views

Wire multiple protective earth conductors together

I'm currently designing a circuit that will use a microcontroller and several relays to switch multiple loads connected to AC mains, and the connections to mains will be inside the enclosure. I'm ...
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3answers
406 views

Current through protective earthing

Is there a way to estimate the magnitude of the current that would flow through the protective earthing of an electrical equipment in case of a fault? I recently had an equipment fail in this manner ...
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1answer
121 views

Toaster Oven Reflow Thermocouple Grounding

In order to create a homeade reflow solder oven, I am using a K-type thermocouple connected through a MAX6675 module and reading it with an ATMEGA8 microcontroller. When the oven is disconnected from ...
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2answers
515 views

Grounding audio circuit for RFI immunity

I am trying to determine the best way to ground the following audio circuit for best RF immunity. Right now I'm looking at two options, and am not sure if there's even really much of a difference ...
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2answers
897 views

Connecting Analog and Digital Grounds

I am designing a system that incorporates an FPGA, a few ADCs, and a few DACs. I am curious as to what my best options may be for grounding in my system. The FPGA is on its own daughter board, but ...
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1answer
134 views

charging electric car battery through road - grounding? [closed]

Alright then, hi all. For a Mobility Design Master Thesis Project I want to charge an EV battery through the road while driving. I just can't get to grips with this. I'm slightly frustrated, don't ...
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2answers
451 views

PCB design - Ground fill on every layer? [duplicate]

Im currently working on a PCB design, where I will have 6 layers The stackup will be: Top signals GND layer Signal 3 Signal 4 Powerlayer Bottom signal Right now I have an full Ground ...
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1answer
783 views

Float Function generator

Why are the Outputs of many function generators earth grounded? As far as I understand grounding the generator or Parts like the chassis can reduce shock hazards if something fails within the ...
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2answers
803 views

Confusion in grounding shield wires of transducers

There is a 6-wire Wheatstone bridge type load-cell and one of the wire is called shield and it is electrically connected to the metallic case of the load cell as below(I marked that with yellow ...
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1answer
238 views

The difference between technical ground and safety ground?

1) can someone clarify the differences between safety ground and technical ground? Why or why wouldn't we always have both? I'm thinking mostly in a North American context. 2) Are there best ...
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1answer
489 views

Do I need ground for RS-485 if it is galvanically isolated?

I am designing an RS-485 communication. The communication interface is isolated. So, only the noninverting and inverting line will be connected outside to the cable. I know that I have to include ...
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1answer
159 views

How to handle 2nd USB and Audio ground in a project powered from isolated 5V Wall Wart

I've read a dozen questions that are similar to mine, but have not found any responses that provides the specific guidance I am seeking. Here are some that I've read: Ground Connection When Using ...
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1answer
2k views

Ground return paths versus ground loops in digital PCB routing

I have a two layer PCB, where I do not have the liberty of adding power planes. (However, I potentially could add ground or power pours). My issue is that I am trying to decide whether I should use ...
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2answers
668 views

Does electricity always flow in a closed loop and why does current flow to ground?

I have been taught that current flows in a closed loop back to the source. And with electrical distribution, current flows to ground because the whole grid is effectively grounded back to the source. ...
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2answers
1k views

Dual Power Supply (Two 9V)

I am Not Good At This, and I am trying to breadboard this circuit here: http://www.instructables.com/id/DIY-EEG-and-ECG-Circuit/ But I am stuck on the power supply. The instructions state: ...
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2answers
54 views

Exposed bulb/wiring project [closed]

Apologies if this is the wrong exchange. I would like to start a home project, in which screw-in bulbs are left mostly exposed, and connected to semi-flexible wire. Something similar to this: A ...
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4answers
335 views

Why earth ground connection does not leak current?

This seems like a question which has been asked multiple times on forums. I researched the problem but I still was unable to figure out the answer which I can at least intuitively understand. So in ...
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1answer
203 views

Can daily 90VAC shocks have effect on human body? [closed]

There is external audio card on my desk with gold plated ports. For several years, whenever I accidently touch these with my elbow I would get a little shock, sometimes I would touch the PC case with ...
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3answers
266 views

RS485: Where to connect the cable shield in a battery-powered system?

I have implemented a Modbus with the RS-485 bus. The length of the bus is about 80 meters and I have connected the master and 10 slaves. The system is battery-powered and will be outdoor. My question ...
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1answer
69 views

Does my electric clearing field actually make ions?

I am using an electric clearing field of 15v/10cm (~150V/m) to remove ions from a test chamber, however I'm wondering to what extent the localisation of the field's reference voltage plays a role. ...
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1answer
63 views

Is connecting a grounding rod to the positive side of a battery wrong?

I have a 12 V battery being charged by a wind generator. The installation instructions show the grounding rod on the negative side. I have been having power issues with the batteries draining to ...
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0answers
410 views

When is it safe to ground DC- (specifically audio output)?

With regard to audio devices, if all equipment is unbalanced and there are no DC- connections to earth ground, equipment will generally operate hum/noise free despite large common mode voltages ...
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1answer
680 views

Why have a ground rod?

I read this on another site: "In a properly designed circuit, if a fault were to occur on the 120-volt outlet between the hot-wire and the ground, the current will flow through ground wire back to ...
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1answer
707 views

The curse of the ground loop

Sometimes it feels like a ground-loop is inevitable. Please follow along the following thought-experiment. It would be wonderful if you could provide solutions to the issue described. Imagine a board ...
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1answer
45 views

How reliable are “earthing detectors” on surge protections?

I have APC's surge protector and it can, according to the manufacturer, detect if power socket is earthed.How reliable are these detectors? Surge protector link
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1answer
99 views

Grounding everything - safely

I have the very annoying problem of not having grounded wall sockets in an old house. Because of this, e.g. my large SMPS has a voltage potential of 115V AC to a ground wire I pull to a radiator. ...
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1answer
24 views

Anode potectial in industrial electroplation operation

I am modeling a large (physically 125' x 12' x18") electroplating line. The line has a common anode (industrial plain carbon steel 1 x 1-1/2" x 1/4" floor grate) with multiple pairs of rectifiers ...
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1answer
325 views

Star point selection in Altium Designer

I want to have a star topology for my circuit's ground in Altium Designer, So I defined this rule from Design -> Rules: It's all fine until this step, But I can't select where to be the source of ...
2
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1answer
78 views

Which one of these shielded scenarios is correct?

I have a system were both the signal generated and the sensing equipment is sharing the same ground. Which one of these shield terminations scenarios is correct? (if any). I searched the internet for ...
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3answers
514 views

Connecting a microcontrollers ground pin to a reference above ground

When I was at work the other day I was pulling apart an LED fault detection unit. I noticed they were using an Atmel ATtiny13A as the brains. The interesting thing is this unit was multi-voltage and ...
2
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1answer
102 views

Is there a way to check integrity of earthing provisions?

We have a complex network of earth wires and earth pits. These earth wires are connected to power panels and CNC machines. However, the earthing system is very old and poorly maintained. Is there a ...
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1answer
145 views

Increase accuracy of ADC without device AGND

I am using the ADC of the PIC16F18344 — http://www.microchip.com/wwwproducts/en/PIC16F18344 It has neither Avdd nor Agnd, but it does have selectable Vref+ and Vref- pins. If I were to stop using ...
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0answers
43 views

Measurement of station grounding resistance and test electrodes

This is a pure electrical engineering question. I have seen a request for embedding test electrodes and connect them by "disconnectable" joints to a few earthing bars inside a station building, in ...
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1answer
72 views

Modifying power strip in enclosure to attach to power entry connector

We are using an off-the-shelf power strip to distribute power to several devices in a large aluminum, painted Hammond brand enclosure. We'd like to be able to switch the power on and off with an ...