Tagged Questions
0
votes
1answer
137 views
How does this heavily oxidized copper-to-steel joint work in earthing?
Wikipedia article on grounding features this photo:
Here's a close-up of the joint:
Clearly the steel rod is heavily oxidized and the copper wire is oxidized. The clamp is coated with something ...
7
votes
2answers
197 views
Grounding and why charge leakage occurs
A basic nugget of info is missing in my end-to-end picture of how grounding works and why it's important. When a voltage is applied in a circuit the electric current starts flowing (or the field ...
5
votes
1answer
216 views
How is the following ground symbol different from conventional ground?
I've seen the following ground symbol in quite a few schematics:
How is this different from the typical GND symbol?
2
votes
2answers
142 views
Can current be drawn from ground in a SWER transmission setup?
I am almost certain that this is a ridiculous question, but cannot figure out why this scenario would not work.
From what I understand, current from the electrical station is distributed to houses ...
2
votes
0answers
70 views
Ground problems in kitchen [closed]
i have had some trouble in my kitchen recently about some tingling stingy feeling while touching the kitchen sink. and stove metal.
my toughts is that here is some ground problems but I could not ...
3
votes
2answers
266 views
Captive Nut For PCB Grounding
I need to affix a ground strap to my PCB. A strap similar to .
Ideally I want to simply screw this to the board. Are there captive nuts available for this purpose? I can't find anything via a ...
7
votes
2answers
1k views
When to use ground plane cutouts?
I've been reading more about proper grounding techniques and using ground planes.
From what I've read, ground planes provide a large capacitance with adjacent layers, faster heat dissipation, and ...
3
votes
2answers
837 views
How to check if something is mains earth grounded?
Suppose I would like to verify that the ground terminal on an indoor power outlet is actually connected to the ground (from what I've read, some of them aren't!). How would I go about checking that?
...
6
votes
2answers
156 views
Grounding Shielded Panel-Mount Connectors
I'm building an amplifier in a conductive metal chassis. The general grounding plan is to have an audio ground, a power ground, and a digital ground that converge at a single point on the chassis. ...
9
votes
1answer
2k views
With shielded twisted pair cable, do you ground one end, both ends, or neither ends of the shield
I've got a project coming up that's to be doing RS-485 communications over shielded twisted pair cable. The project will involve cable length runs of many 10s of ft and the cables will probably have ...
5
votes
2answers
673 views
Why we use ground
I have been wondering this for a while, so I did some digging, and as usual, wikipedia was the most illuminative. It looks like the telegraph was the first time ground was introduced to complete a ...
1
vote
4answers
1k views
Should NC-Pins of IC connected to ground through a resistor to prevent noise?
I wonder if unused pins of an IC, lets say an NE555 f.e., should be connected to ground via a resistor to prevent noise or not. I have an AVR with analog inputs and just realized there's huge noise, ...
3
votes
2answers
332 views
Why the measured voltage increases when I change ground reference?
The following image shows my connections:
The grounds of all devices are connected to a common PCB. When I measure the 1.2V referenced to the ground on my PCB, it reads 1.201V which is great. But ...
5
votes
3answers
314 views
Why would a power supply unit with insulating case and galvanic separation need a grounded power cord?
Recently I witnessed an external IBM laptor power supply that looked like a usual switched-mode power brick (rather small and lightweight for it more than 50 watts power) in plastic case but had a ...
48
votes
6answers
7k views
Should chassis ground be attached to digital ground?
I'm working on a PCB that has shielded RJ45 (ethernet), RS232, and USB connectors, and is powered by a 12V AC/DC brick power adapter (I do the 5V and 3.3V step down on board). The entire design is ...
8
votes
4answers
1k views
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 ...
