All Earth or Grounding related topics - troubleshooting tips, measurement and fix
Majority of the AC outlets of our country do not have a proper grounding or earthing. Specially for old buildings.
Lets discuss, learn the basics and share troubleshooting tips and fixes.
My knowledge in this particular topic is fairly limited to very specific yet critical subject matters which I will share.
I would however encourage others to step in with correction, enhancement , example, tips, safety concern or better way of measuring things.
Lets start with below topics.
1. Ground Loop: This is BAD and we have to avoid it. See below why.
The curved Ground connection (from F to B or F to A) should not be made because it makes a ground loop.
Below are 2 BAD examples that creates ground loops.
During the event of surge, the surge might stay within the loop rather than going straight to the ground.
one faulty equipment in your building that is putting in noise in the power line might interfere with another good equipment. The most common example is 50hz hum coming from audio eqp.
Many bizarre behavior of computers and electric equipment are also caused by ground loops.
If there was no ground loop, that noise would have gone to the ground without interfering other electrical equipments such as computers, audio systems, TV etc.
Effort should me made so that Grounding follows a single one way direction to main ground point at mainboard/power board. In the above case just removing grounding between E and F should fix ground looping. If your building has multiple grounding source that may also create ground loops.
Remember: The function of earth is to provide low resistance path when a fault current is produced so that the circuit protective devices( such as UPS, Surge protectors, MOVs built within the power supply) operate rapidly to disconnect the supply.
Facts: The Tv cable connection that comes from the outside brings along a ground connection to the TV. If that TV is grounded to your building then you already have a ground loop problem assuming you have your own ground connection to your apartment or for a particular device such as your PC.
So How do you know that you have a Ground Loop?
Ground to Neutral voltage ( aka Stray Voltage)
Good : If you measure the neutral and Earth/grounding wire you are suppose to get a reading of 0 volt.but then In real life you will however always see a very small amount of voltage. The smaller the better.
but If you do get a high voltage difference between Ground to Neutral voltage. look at below fixes.
Recommended Fix: PLEASE DO NOT TRY TO APPLY BELOW FIX BY YOURSELF) Ask an electrician to do it for you.
- Make Sure The Neutral Wire is Connected to the Earth or Ground Wire " Only" at the main power board which is usually located at the ground floor of a building. This should be the only place, where your ground should be connected to the neutral wire.
Except the the above point, The neutral, Ground and live( aka hot) wire should be separate throughout the building.
- Make sure you have only one ground connection in the building.
- Once the above is ensured keep measuring the difference up to the point where you have found high voltage difference between Neutral and ground. Ideally you would be looking for a faulty device which is causing a leakage of electricity to the ground wire.
....more updates coming....
Any casual assumption or offtopics will be deleted instantly.
Try to contribute with correction, suggestions, tips But do so with proper reference,logic,academic reference or work experience.
Last edited by minitt; October 2nd, 2015 at 00:16.
Live or hot or Positive wire = jei point a typical tester lagaile light jole.
Originally Posted by VANGUARD
If u connect the tester to the Ground or Earth wire IT SHOULD NOT light up. if it does you have a problem.
Thanks a lot for this topic.
I was actually looking for such explanation.
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