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  1. #31
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    Default Re: Upgrading 2-prong to 3-prong in old 2-wire system

    What other purpose does it serve? None. But because the neutral is grounded at the transformer, ground becomes a return to the transformer. Without that connection and the ECG connection at the panel, ground would not provide a return. In that case if you touched a hot wire to ground nothing would happen. If you had a hot shorted to the case, of say a washer, and you touched the case and a water pipe you would not get shocked. The only purpose of the ECG is lightening protection, and bonding is a compensation for a problem the lightening protection causes. A GFCI dose a much better job because it dose not require 15 or 20 amps to react.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  2. #32
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    Default Re: Upgrading 2-prong to 3-prong in old 2-wire system

    Oh, by the way the grounded wrist straps were to discharge static electricity which can blow electronic equipment that are completely insulated from ground. But that's a completely different situation and story.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  3. #33
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    jersey
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    Default Re: Upgrading 2-prong to 3-prong in old 2-wire system

    So what would happen if there was no ground rod at the transformer and only at the service?

    Would it work?
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  4. #34
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    Default Re: Upgrading 2-prong to 3-prong in old 2-wire system

    picture by Etch-a-Sketch ........
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    Last edited by canuk; 06-09-2010 at 07:08 AM.
    "" an ounce of perception -- a pound of obscure "
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  5. #35
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    Default Re: Upgrading 2-prong to 3-prong in old 2-wire system

    Quote Originally Posted by Lloyd View Post
    So what would happen if there was no ground rod at the transformer and only at the service?

    Would it work?

    Yes, it would work as it does now. If there was no ground at the transformer and no ground rod connection or bonding at the panel every thing would still work except for the lightening protection, the only difference is you would not get shocked touching a hot while touching a ground.

    Here's an easy experiment for you to try. Hook up a 24volt door bell transformer and turn on the 120volt input. Now take a meter and read the voltage from either output leg to ground and you will get no voltage but you will get 24 volts across the legs. Now tie one leg to ground. now you get 0 volts from that leg to ground and 24 volts from the other leg to ground. With out a ground connection there is no current flow to ground period. That's the difference between an isolated system and a grounded system.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

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