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Questions tagged [earth]

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18 questions with no upvoted or accepted answers
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Should I connect stepper motor case to mains earth or power supply V-

I have a stepper motor driver, the sockets have the expected V+,V-, etc. However there is a bolt with a grounding symbol on the outside, I think this connects to mains earth? The third pin on a plug? ...
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66 views

What is the impact of Earth's magnetic field polarity on consumer electronics?

Earth's magnetic poles are known to have inverted in the past. How are commonly used circuits or component of consumer electronics (from energy production/transportation to TVs, mobile phones and PCs) ...
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1answer
110 views

Why am I reading 22VDC / 69VAC when measuring between myself touching a MacBook and ground?

If I put the positive probe of my multimeter on earth, and touch the negative probe with my hand, while another hand is touching the metal surface of my MacBook, I get around 22VDC or 69VAC. I cannot ...
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1answer
166 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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0answers
664 views

Potential difference between DC floating power supply and earth ground

I have a question about a simple DC floating power supply: it is as simple as possible, secondary coil -> bridge rectifier -> filter cap, as shown on the figure below. If I connect the input of the ...
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393 views

MOV failures in DC

We are facing an issue in our protection circuitry. For the below DC design MOV between Earth is getting damaged in the site. MOV 2 & MOV 3 in the circuit is failing in the site. System is ...
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0answers
184 views

DIN Rail with In-Rail Bus - GND/PE design question

We are designing a system that consists of several modules that are mounted on a DIN rail. They are connected to each other using an In-Rail Bus system like this: System design: The 5 bus line ...
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0answers
177 views

Earth Loop Impedance Meters; Difference between 3 lead (L-N-E) and 2 lead (L-N/E)?

In our company we use various different brands / models of ELI meters. Some have three leads, live, neutral and earth, and some have only two leads, one live and one neutral/earth combined. Can ...
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38 views

What do the white and green colours on the earth leakage CB denote?

I've come across two 4 pole earth leakage circuit breakers, one with the all green lever and another with white levers for phases and green for neutral. Is there any special meaning to this? I've ...
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42 views

between earth and ground

In my 100 Watt ACI Drive circuit, I've confusion about which components will be best to connect between DC_Bus Ground & Earth? FYI: 300 VDC for Motor & 15 VDC for Logics & other ...
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1answer
37 views

Do the dipole antenna edges have earth potential or is it a closed circuit made of co-axial cable?

I understand the shape of the dipole antenna, but how is it fed so that the current only flows through one direction during the half cycle? Even in a normal pole antenna, is there a ground at the edge ...
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1answer
109 views

SMPS electrical noise issue

1I'm using class 2 medical graded SMPS in our device. So earth connection not recommended. When connecting SMPS to load (contains capacitive touch LCD), touch function is affected by SMPS noise. When ...
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47 views

LED lamp lighting with only 1 pin connected to earth which isn't connected to anything

Anyone can help figure this out? Yesterday, while connecting my LED lamp projector with an AC plug, I noticed when one of the 2 pins was connected to the earth pin of my AC extension cord, it would ...
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81 views

No grounding system available for oscilloscope, what other options are available?

Many old buildings/houses in Europe are so old that they were not built with a grounding system. I happen to live in one were this is the case. The problem is that if I want to use an oscilloscope, it ...
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488 views

Converting an ATX power supply to bench power supply.

I'm planning to convert an ATX power supply to a bench powersupply. It came to my knowledge that the DC ground is actually connected to earth. As I understand, this might become a major issue if I ...
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35 views

Is it possible to detect and filter noise on an earth?

I ask because I have a solar array on my house with micro inverters. The monitor (an Enphase Envoy) no longer detects the the inverters. Troubleshooting suggests noise on the earth, perhaps caused by ...
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1answer
76 views

How to decide earth trace width in protection circuit?

I am using the earth trace for protection circuit in telecom system. The protection circuit includes MOV, sidactor & fuse. So please suggest How to calculate the Earth trace width.
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1answer
168 views

How to earth connector with plastic case

My board has a power connector from Glenair 171-006. Input is 5V DC. This connector has a plastic case. My question is, can I use one of the connector contacts to connect to EARTH? Will it cause any ...