Building Code and Building Construction - Questions and Answers
Or when you want to know how construction is supposed to be done.

|
AskCodeMan.com
|
The following Codemen are available to answer your questions:
All Codes and Standards - Jerry Peck, Codeman


Q&A Board links
  • REGISTER

  • FAQ

  • LOGIN

  • Q&A BOARD INDEX

  • View New Questions

  • View Unanswered Questions

  • View Active Questions/Answers

  • Mark Questions as read

  • View Your Questions

  • Go To Your User Control Panel




  • Links to:
  • Construction Litigation Consultants


  • Florida Building Commission

  • Florida Building Codes Online


  • International Code Council

  • ICC Codes Free Online


  • Building Officials and Administrators of Florida




  • Product Approvals
  • Florida Product Approval

  • ICC Evaluation Reports Search

  • Miami-Dade NOA Search




  • Inspector and Contractor License Search
  • Search Florida Licenses




  • Technical links
  • Technical Information page


























































  • Contact Codeman



  • Custom Search

    Water pipe grounding

    Water pipe grounding

    New postby carterjs on Mon Feb 01, 2010 12:38 pm

    I have copper pipe throughout the house, but the incoming copper pipe is connected to a galvanized pipe sprinkler system through an insulating union. My electrical ground uses the copper pipe as the grounding electrode. In order to improve the grounding, can I use a copper wire to jump across the union, thereby connecting the copper pipe to the galvanized pipe? If I do this, will the pipe still be protected from corrosion?
    carterjs
     
    Posts: 4
    Joined: Mon Feb 01, 2010 12:20 pm

    Re: Water pipe grounding

    New postby Jerry Peck - Codeman on Mon Feb 01, 2010 6:31 pm

    carterjs wrote:the incoming copper pipe is connected to a galvanized pipe sprinkler system



    Before answering that question I have a question as the answer may lead to other aspects not being considered:

    The "sprinkler system" you are referring to, is it a fire sprinkler system or is it to a lawn irrigation system?
    Jerry Peck - CodeMan
    AskCodeMan.com

    Construction and Litigation Consultant
    Construction Litigation Consultants, LLC.
    ConstructionLitigationConsultants.com
    User avatar
    Jerry Peck - Codeman
    Site Admin
     
    Posts: 1089
    Joined: Fri Dec 12, 2008 12:06 pm

    Re: Water pipe grounding

    New postby carterjs on Mon Feb 01, 2010 6:41 pm

    It's a lawn and garden sprinkler system, all made with 3/4" galvanized pipe. Most of the pipe, and there must be about 100 feet of it, is buried and not wrapped in tape. Thank you for tackling this question.
    carterjs
     
    Posts: 4
    Joined: Mon Feb 01, 2010 12:20 pm

    Re: Water pipe grounding

    New postby Jerry Peck - Codeman on Mon Feb 01, 2010 8:54 pm

    Okay, based on the information at hand I am understanding you this way:
    - The incoming water service pipe from the city water supply is copper for more than 10 feet (10 feet is the minimum length of metal water piping underground for that metal water piping to be used as a grounding electrode) and this water service pipe is teed off to a galvanized sprinkler pipe, probably teed off outside the structure, then the copper piping continues into the house as the water distribution system piping - correct so far?
    - Now back to the tee between the galvanized sprinkler pipe and the copper water service pipe, I am presuming that is connected as follows: copper water service pipe to a copper tee to copper water service pipe to copper water distribution pipe inside the house, with a male (or female) adapter off the copper tee to a nipple to a dielectric union to the galvanized lawn irrigation sprinkler piping - correct so far?

    1) The lawn irrigation sprinkler piping goes through an air gap/atmospheric air gap/some type of backflow prevention device before going to the lawn irrigation sprinkler system (this is required to help keep from contaminating the potable water coming into the house).

    2) Where is the grounding conductor you are describing connected? Are you sure it is a grounding electrode conductor to the copper underground water piping, or, could that grounding conductor actually just be a bonding conductor bonding the metal interior water piping system to the grounding system?

    3) The galvanized lawn irrigation sprinkler system piping is not required to be bonded to the grounding system, however, it would be required to be used as a grounding electrode as all grounding electrodes which are present are required to be bonded together.

    4) If the metal water piping is actually being used as the grounding electrode, then it is required to be supplemented by another electrode.

    5) Back to your original question regarding the dissimilar metals ... use a brass pipe clamp on the copper piping and a brass pipe clamp on the galvanized piping, with a copper wire between the two clamps. Brass is compatible with galvanized as it has zinc in it as well as being compatible with copper. That isolates the dissimilar contact between the copper and the galvanized and makes the electrolysis path through compatible materials.

    Hopefully, that answers your questions and some questions you did not even ask.
    Jerry Peck - CodeMan
    AskCodeMan.com

    Construction and Litigation Consultant
    Construction Litigation Consultants, LLC.
    ConstructionLitigationConsultants.com
    User avatar
    Jerry Peck - Codeman
    Site Admin
     
    Posts: 1089
    Joined: Fri Dec 12, 2008 12:06 pm

    Re: Water pipe grounding

    New postby carterjs on Mon Feb 01, 2010 10:22 pm

    Thank you, Jerry, now all I have to do is find where to buy brass pipe clamps.

    Another thing I'm hazy about is whether I have to keep the house upgraded to the latest plumbing, electrical, heating, etc. code requirements, or whether it's OK to maintain it as built as long as there is no new installation. What can you tell me about this?
    carterjs
     
    Posts: 4
    Joined: Mon Feb 01, 2010 12:20 pm

    Re: Water pipe grounding

    New postby Jerry Peck - Codeman on Mon Feb 01, 2010 10:34 pm

    carterjs wrote:Another thing I'm hazy about is whether I have to keep the house upgraded to the latest plumbing, electrical, heating, etc. code requirements,


    Nope. If installed to code at the time of installation it may remain to the code at the time of installation.

    or whether it's OK to maintain it as built as long as there is no new installation. What can you tell me about this?


    Yep, as long as you do not do any work on anything ... all new work is required to meet the new current code in effect when the work is done, regardless how old the surrounding work is.
    Jerry Peck - CodeMan
    AskCodeMan.com

    Construction and Litigation Consultant
    Construction Litigation Consultants, LLC.
    ConstructionLitigationConsultants.com
    User avatar
    Jerry Peck - Codeman
    Site Admin
     
    Posts: 1089
    Joined: Fri Dec 12, 2008 12:06 pm


    Return to Plumbing: Water heaters, fixtures, traps, hose bibbs, water pressure, supply & DWV piping



    Who is online

    Users browsing this forum: No registered users and 2 guests



    www.AskCodeMan.com