Questions tagged [earth]
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190
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Earthing: TN in TT installation?
Something odd happened at work today: the whole building installation is TT, just like the whole country. L1-L2-L3 supplied to the transformer and then L1-L2-L3-N goes to the loads.
I noticed that we ...
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Earth for custom POE+ board design
after getting the center tap pins for poe, I have an example schematic to design an EARTH ground. I have the understanding that that would be our Earth in AC over cabinet. That would remove our value ...
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What is the purpose of connecting your reference ground plane to earth when doing radiated emissions testing?
In most standards it's required to connect the reference ground plane to earth.
However in a lot of cases the reference ground plane is elevated above the earth by a set height.
If you left the earth ...
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Earth Resistivity Test on concrete base
I am planning to conduct an Earth Resistivity Test on my property. The issue is that my building's basement is entirely covered with concrete and pavement, and we intended to use the Fall-of-Potential ...
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Should RVs electrical system be grounded to chassis?
I have an RV with both 12V and 230V systems. The 12V uses internal battery, while 230V is supplied from outside via plug. Should I connect these systems to metal frame of vehicle (minus of 12V or ...
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Dangers of floating oscilloscope
Conversation between Bob Pease and Paul Rako taken from this video, where Rako talks about modifying an oscilloscope such that it is not connected to earth:
Pease: "Have you ever tried hanging a ...
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Can this way verify whether the earth pin is grounded or floating?
I want to check whether the earth pin of the electric AC wall socket is really connected to earth. But I only have access to the socket’s phase, neutral and earth inputs.
I have no access to any known ...
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Connecting '-' terminal of the power supply to the earth GND
I've already asked a similar question in the past, but I want to make sure I understood things correctly.
Attached is the current lab setup for my chip testing. The green square represents the main ...
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USB peripheral: connecting USB shield to GND?
I have read through many recommendations articles, and many StackExchange questions, but haven't come up with any clear understanding as there are many conflicting information out there. The simple ...
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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 ...
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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 ...
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Earth Leakage Breaker Trips .. Where is the problem?
I am trying to install a UPS in my home .. diagram of the circuit attached. UPS is in first floor. Both floors have separate main circuit breakers .. Ground floor has Earth leakage breaker while First ...
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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 ...
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Correct configuration for adding an earth terminal block?
I have a small motor controller test board setup like the diagram below:
A few loads such as a motor controller, and some switches are connected to the live and neutral terminal blocks for power. ...
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Creating a thermostat regulated water heat bath that won't electrocute me if I touch the water
I have a basic knowledge of electronics and an even better knowledge of film photography.
I'm looking to create my own heated water bath with a thermostat that will allow me to adjust the temperature ...
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Is there any way to easily gain access to "actual ground" in an IT grounding system?
As the title asks, is that possible? By "easy access" I mean through some connection I can find inside my home, rather than burying my own grounding electrode and running wires from it to ...
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What is a short-circuit proof cable?
German norms and standards (VDE 250 Teil 602) specify, that wires and cables, rated for 3kV can be considered as "short-circuit proof" and "earth-fault proof" in low-voltage ...
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Making earth pit in swampy area
I recently made an earth pit in a swampy area. I dug the earth up to 5 feet as water was available at 4 feet depth. I poured charcoal and salt in the ratio of 3:1 . After braising the copper plate ...
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How many "grounds" are there and what is the difference?
I stumbled upon many terms for ground, naturally as newbie I got very confused.
ground earth
chassis ground
earth ground
common ground
signal ground
Are there any more?
I assume some are for AC and ...
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Change the range of Earth Resistance Meter to measure lower resistance values
I have an analog Four Terminal Earth Resistance Meter with 100 ohms as the maximum range and 1 ohm is the resolution. The scale is linear. I need to measure low resistances below 1 ohm. How can I ...
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Why are conductive chassis double insulated appliances allowed in the UK?
MacBooks are infamous for 'buzzing' to the touch while charging. If another (properly Earthed) laptop touches one, it can flicker the screen or shut down. If I plug one of these same properly Earthed ...
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Earth pin in a 3-pin mains plug [closed]
I bought a new pressure washer online and it has a 3-pin plug as shown in the picture, but there are only two pins protruding out from it.
The two pins fit into my standard 3-pin socket and it works ...
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What is the difference between earth and earth from a power outlet?
I'm having a real difficult time understanding the following statements from various sources:
That's what I was told: don't use the earth pin from a power outlet as your earth because it's dangerous.
...
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Are shoes comparable to capacitors if receiving electric shock from one lead?
I seem to not totally understand the way how we can receive an electric shock when touching only one lead of a general power outlet (230VAC):
Are our shoes/wooden floor/concrete like a capacitor ...
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How can I check if I'm properly grounded?
I figured that if I used my trusty ol' calibrated Fluke 77 multimeter and:
Set it to Ω measurement
Measured between the ground terminal of an electrical outlet and a bare metal pipe fitting on a ...
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What is the potential of earth relative to mains live and neutral? [duplicate]
I'm confused about the theory of earthing in mains electrics. In particular, how the potential of "earth", the ground or literally the soil beneath my feet relates to the live and neutral ...
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Ground Symbol, which one I should use?
I normally use this symbol in my schematic as my signal ground.
But recently my manager asked me to use this symbol instead because the one that I am using is the earth ground and I should use the ...
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Thermocouple readings affected by PE
I designed a controller for an electric pizza oven. The PCB has an MP-LDE03-20B0 power supply module on it. Everything works great except for measuring the temperature in the oven. I use thermocouples ...
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Addressing poor Earth resistance on hill top
I work in a radio station situated on a hill top. The Earth resistance measured at this location is quite high, measuring around 9 Ω. There is no deep gorge nearby to make a fresh Earth Pit. How can I ...
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Earth wiring in an AC circuit
In this circuit there is a power supply source of main AC 220 V - 50 Hz and a load:
There are two wires out of the main supply (neutral) and (live).
The earth is connected to the neutral.
If I am ...
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Van conversion hookup point AC Earth to chassis negative
I'm helping my brother convert his van into a camper and installing solar panels, a leasure battery, and hook-up point, but I'm slightly confused. I've been working on the hook-up and loads of things ...
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Grounding resistance dependency on distance
I am currently learning about grounding in electrical installations and there is something that intuitively doesn't really make sense to me. It is related to the resistance measured between two ...
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ESD damage without earth ground
Can you explain how a totally floating PCBA (with semiconductor chips/ components stuffed, but no any connection to earth GND) is damaged by an ESD event from human touch?
If human body is charged to ...
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CNC Servo System Grounding
Here it's a sketch of a simplified CNC servo system.
The servo drives are non isolated (Digital GND connected to Power GND, drawn as GND)
(My main question on the picture too)
#1: Why some ...
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Can I use an exposed water pipe as a reference only?
The outlets in my working space are unearthed, but there is an exposed copper bit of heating pipe that appears earthed (there is 230 V between it and the outlet). Now, after some research here I've ...
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Is earthing pointless without a residual-current device?
I don't quite understand what the situation is with the safety ground.
In theory, it evens out the voltage to zero but only if the resistance is exactly zero.
Even if the ground has only a resistance ...
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Is it okay to short earth and neutral pins in 3 pin sockets?
One of the plugs in my room did not have any wires attached to the earth pin. Whenever I connect any device that has a metal casing, I get a tingling feeling if I brush my hand against the casing. I ...
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Cable shield connection: ground or earth
I have an analog sensor which features 3 wires: power supply +, ground (common for supply and signal output) and signal output iself. Sensor is working in industrial environment. I am using shielded ...
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DC power supply 10V AC between terminals and mains earth
My DC power supply shows 10V AC between earth and one of the terminals. How can I fix this, and is it safe to probe circuits with an oscilloscope, that are powered by it? The PSU ground terminal is ...
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How to test if a domestic 3 phase power company meter is reading wrong?
BACKGROUND:
Domestic 3 phase 220VAC supply in Thailand.
Power company meter is 4 wire GE 3 phase 15A/45A.
Massive power bills when mains breakers were turned off (back in home country for 9 months ...
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What are default rules to connect cold part to protective ground?
I have a device, what have hot and cold part. I want to protect cold circuit what contains user interface from HV leaks or breakouts.
In professional PCB im frequently seen cold-common connected to ...
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When do I need a protective earth?
My company is developing a new handheld power tool. We are a rather inexperienced team and I am not a electrical engineer but I am concerned about the safety of our customers. We are located in ...
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Safest way to ground a metal enclosure
I am currently building a nixie clock with some high frequency components (GPS) and I am planning on putting the clock in a metal enclosure. The highest voltage used in the clock is approximately ...
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ESD protection on floating circuit - Capacitor from circuit ground to earth?
I'm not very familiar with proper ESD protection and wondering about the correct implementation of a TVS diode to protect an input of an isolated circuit.
In the case of an ESD event into the ...
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Do automobile DC systems sport a device synonymous to the electrical infrastructure that we call Earth Ground wiring in standard household AC systems?
In automobile DC circuits, the chassis is typically connected to the negative battery terminal and, thus, the chassis provides the infrastructure for closing the DC circuit. In diagrams, this is often ...
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Limits to use an off-the-shelf grounded AC-DC power supply with a two-prong cable
We are selling a product using an AC-DC power supply manufactured by CUI INC (SDI24-5-U-P5 datasheet). We sold the product in a few European countries but we are currently talking with a new ...
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Connecting GND on secondary side to protective ground
We have a battery powered equipment which mainly consists of a temperature sensor connected to a microcontroller via a filter. In addition to battery power we have now added the possibility to use a ...
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Cat 6 STP 4x2x23AWG 500MHz cable earthing without using connectors
Regarding the following wire, I will use this to connect some signal wires between sensors and microcontroller, the only problem being that I will not use any dedicated connectors. Instead, I will be ...
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current path into the ground?
Considering a monopolar HVDC system, with the ground as the return path.
I was wondering if the current path is physically speaking like the red one or the green one in the picture? I think it is like ...
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Electronic earth
I just want to know basic information about it and why it is not to be connected with main ring of electrical plant.
If there are any references for it i will be grateful.
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