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Thread: Bonding gas pipe at the water heater

  1. #1
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    Bonding gas pipe at the water heater

    I did a main panel upgrade in Temecula Ca. I upgraded a 200 amp center fed panel to a 200 amp solar ready panel. There was a existing bare #4 ground wire to the uffer and a #6 bare wire to the water pipe. I jumped a bond wire at the water heater from the cold to hot water pipe then to the gas pipe. The inspector wanted to fail me because she said that the gas couldn't bonded this way. She said I had to run a separate ground wire from the gas pipe to the main panel. I have asked other inspectors in other cities about this and they have said it is ok. This is the way I usually do it. I couldn't find a code reference. Am I doing this wrong?

  2. #2
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    I believe that is okay since the bonding goes back to the panel, however a $6 to the water pipe is not compliant for 200 amps. Look at table 250.66 or 250.102(C)(1)?

  3. #3
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    What type of gas pipe? Black pipe requires no bonding jumpers.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  4. #4
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    Quote Originally Posted by Dennis Alwon View Post
    I believe that is okay since the bonding goes back to the panel, however a $6 to the water pipe is not compliant for 200 amps. Look at table 250.66 or 250.102(C)(1)?
    The bonding would go back through the water pipe and then the grounding electrode conductor that attaches the water pipe to the main panel. 250.66(A) says Where the the GEC is connected to a rod or pipe that it doesn't have to be bigger than #6

  5. #5
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    Quote Originally Posted by Anthony Jattett View Post
    The bonding would go back through the water pipe and then the grounding electrode conductor that attaches the water pipe to the main panel. 250.66(A) says Where the the GEC is connected to a rod or pipe that it doesn't have to be bigger than #6


    That's for a rod or pipe electrode. The gas pipe isn't an electrode.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  6. #6
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    Quote Originally Posted by Anthony Jattett View Post
    The bonding would go back through the water pipe and then the grounding electrode conductor that attaches the water pipe to the main panel. 250.66(A) says Where the the GEC is connected to a rod or pipe that it doesn't have to be bigger than #6
    Your water pipe is an electrode if more than 10' is metallic and underground. If the metallic pipe has plastic coming in it would still need bonding. For 200 amps these will need a #4.

    The #6 exception is to a rod or a galvanized pipe that is used as an electrode instead of a ground rod. Either way you need a #4 to the water pipe

  7. #7
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    Quote Originally Posted by Anthony Jattett View Post
    The bonding would go back through the water pipe and then the grounding electrode conductor that attaches the water pipe to the main panel. 250.66(A) says Where the the GEC is connected to a rod or pipe that it doesn't have to be bigger than #6

    Your supplementary grounding electrode doesn’t have to be any larger than #6 but your service ground for 200A has be sized accordingly which is, I want to say a #4, to your water main and gas.

  8. #8
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    Quote Originally Posted by lordofthisworld View Post
    Your supplementary grounding electrode doesn’t have to be any larger than #6 but your service ground for 200A has be sized accordingly which is, I want to say a #4, to your water main and gas.
    True that for rod electrodes a #6 GEC is all that would be required, if the "supplementary" grounding electrode were a CEE then you would need a #4 GEC.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  9. #9
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    Black gas pipe (as opposed to CSST I presume) is not required to be bonded? I did not know that. Please provide the Code reference for my continued edification.

  10. #10
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    Quote Originally Posted by richwaskowitz View Post
    Black gas pipe (as opposed to CSST I presume) is not required to be bonded? I did not know that. Please provide the Code reference for my continued edification.
    Black or copper gas pipe is bonded by the appliance branch circuit EGC that the equipment is connected to. 250.104(B).
    "Electricity is really just organized lightning." George Carlin


    Derek

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