Ground rods
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Thread: Ground rods

  1. #1
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    Ground rods

    Who here can tell me what a ground rods real purpose is?
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  2. #2
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    Re: Ground rods

    To ground the electrical system to the earth.

    Its is a return path for unused electrons to safely return to the earth.

    The NEC calls it a Grounding Electrode. And defines it as: A conducting object through which a direct connection to earth is established.
    Just say, Know.

  3. #3
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    Re: Ground rods

    When I was studying for my ham radio license I was taught that a ground rods job is to make sure all points of the system are at the same voltage potential.
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  4. #4
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    Re: Ground rods

    Why is the electricity going into earth?
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  5. #5
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    Re: Ground rods

    From Mike Holt: "Electrical power systems, such as the secondary winding of a transformer are grounded (connected to the earth) to limit the voltage induced by lightning, line surges, or unintentional contact by higher-voltage lines."

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  6. #6
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    Re: Ground rods

    My understanding for a ground rod is for lighting and stray voltages, static. Will not save you from a fault.
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  7. #7
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    My understanding for a ground rod is for lighting and stray voltages, static. Will not save you from a fault.
    You are correct. Generated electricity does not return to the earth because it didn't come from the earth , it returns to where it came from. Most of it will return on the conductors back to where it came from while a very small amount may travel through the earth back to where it came from. This amount will be determined by the resistance of the path and the earth is a very poor conductor so very little current will flow, never enough to clear a fault at the voltages we utilize. Just remember, any generated electrons that enter the earth must end up at their source, every single one of them. That is why it is called a circuit. No circuit, no electron flow. If you block the race track none of the race cars will make it back to the start line and they will simply stop moving.
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  8. #8
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    Re: Ground rods

    Also, as to your question what is the real purpose of ground rods, in my opinion the real purpose is to make money for the manufacturers who have convinced us that they are necessary everywhere.
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  9. #9
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    Re: Ground rods

    Quote Originally Posted by bigb View Post
    You are correct. Generated electricity does not return to the earth because it didn't come from the earth , it returns to where it came from. Most of it will return on the conductors back to where it came from while a very small amount may travel through the earth back to where it came from. This amount will be determined by the resistance of the path and the earth is a very poor conductor so very little current will flow, never enough to clear a fault at the voltages we utilize. Just remember, any generated electrons that enter the earth must end up at their source, every single one of them. That is why it is called a circuit. No circuit, no electron flow. If you block the race track none of the race cars will make it back to the start line and they will simply stop moving.
    Bingo, you have no idea how many people think ground rods will save them in a fault.
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  10. #10
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    Re: Ground rods

    Well 'save you from a fault' is a pretty vague statement. Lots of different faults may occur over a period of time. Bottom a grounding electrode as part of a proper system plays many roles and does much more good than zero ground rods. If any one believes a properly placed ground rod serves no purpose then simply take the dayem thing loose and see how that works.
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  11. #11
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    Bingo, you have no idea how many people think ground rods will save them in a fault.
    In most cases if the electricity is flowing to ground you've already had a fault. A "ground fault" is just that. The normal circuit failed, "shorted to ground" and caused the electricity to flow to ground. That's also usually when all the smoke gets out.
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  12. #12
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    Re: Ground rods

    Electricity wants nothing to do with ground/earth it will always go back where it came from, the transformer through neutral. That’s why it’s very important to have it grounds bonded to neutral in the main panel or meter.
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  13. #13
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    Re: Ground rods

    Quote Originally Posted by Sandy View Post
    Well 'save you from a fault' is a pretty vague statement. Lots of different faults may occur over a period of time. Bottom a grounding electrode as part of a proper system plays many roles and does much more good than zero ground rods. If any one believes a properly placed ground rod serves no purpose then simply take the dayem thing loose and see how that works.
    Ok, where does the electricity go, what pulls it in to the earth?
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  14. #14
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    Ok, where does the electricity go, what pulls it in to the earth?
    here spend a few minutes reading and you will have all your answers...
    https://www.google.com/url?sa=t&rct=...XvIBPLcVfZlFHa

  15. #15
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    Re: Ground rods

    Quote Originally Posted by Hobbytime View Post
    here spend a few minutes reading and you will have all your answers...
    https://www.google.com/url?sa=t&rct=...XvIBPLcVfZlFHa
    As I said what pulls electricity into the earth. I can drive a rod in the earth and hook it up to a breaker and it will not trip. I can’t Make a more dead ground short than that. Electricity always goes back to where it came from, the earth is a very poor conductor.
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  16. #16
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    Re: Ground rods

    The rods do reduce some step potentials between the equipment and the earth you are standing on. I think this is why the push to use uffer in the footers.

  17. #17
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    Re: Ground rods

    Quote Originally Posted by Hobbytime View Post
    here spend a few minutes reading and you will have all your answers...
    https://www.google.com/url?sa=t&rct=...XvIBPLcVfZlFHa
    So far it appears he asked a "question" that he already believes he has the answer for.

    As a result, I'm puzzled by the reason for the question.
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  18. #18
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    Ok, where does the electricity go, what pulls it in to the earth?
    Where does that 'pulls it to the earth' come from ?

    Yes most of the time local earth is a very poor conductor, however there may be times when it is the only conductor. Wiggle your toes into the mud and grab a 120 volt hot lead. That very poor conductor will conduct enough to make you wish you hadn't done that.

    Where is this going anyway? Just pseudo trick questions here.
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  19. #19
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    Re: Ground rods

    So far it appears he asked a "question" that he already believes he has the answer for.

    As a result, I'm puzzled by the reason for the question.
    I agree. Not the most efficient way to start a conversation.
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  20. #20
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    Re: Ground rods

    Ok, let’s say I have a electric motor with a fault to the frame on one of the hot legs and just a ground rod connected to the frame, not bonded. I go touch it am I live with electricity or am I safe?
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  21. #21
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    Re: Ground rods

    We have been over this before.

    Just let it be.
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  22. #22
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    Re: Ground rods

    He who asked questions and knows of a answer still asks question to see other peoples view to try to under stand all possible out comes. But I guess he who asks questions is a bigger fool than he who doesn’t and pretending to know.
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  23. #23
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    Re: Ground rods

    He who uses search function on forum is wise man.
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  24. #24
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    Ok, let’s say I have a electric motor with a fault to the frame on one of the hot legs and just a ground rod connected to the frame, not bonded. I go touch it am I live with electricity or am I safe?
    If the ground rod is installed properly and the XO of the transformer is grounded the breaker will trip because all the current from the hot leg will flow to ground back to XO.

    There are High Resistance Grounding systems in industrial manufacturing plants that connect the XO terminal ( center of the winding on the secondary side of the transformer) to ground through a large resistor that limits the current flow to ground in the case of a ground fault on a motor. This allows the motor to continue to run, even in a ground fault condition until repairs can be scheduled.

    Here is a good link that explains it.

    https://www.benderinc.com/know-how/t...ded-system-hrg
    Last edited by Fast Leroy; 08-01-2019 at 12:06 PM.
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  25. #25
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    Re: Ground rods

    Quote Originally Posted by Bobby Williber View Post
    He who asked questions and knows of a answer still asks question to see other peoples view to try to under stand all possible out comes. But I guess he who asks questions is a bigger fool than he who doesn’t and pretending to know.
    Most people start with something like "here is my understanding, am I missing anything?"

    Way more efficient than questions, get answers, then telling what your understanding is.
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