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  1. #1
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Vault construction details

    I have searched the internet but have not found what I am looking for.
    Do any of you know the construction requirements for underground vaults for utility companies.
    In particular:
    Is a Drain required?

    NHIE Practice Exam
    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  2. #2
    Join Date
    Jul 2008
    Location
    Snowbird (this means I'm retired and migrate between locations), FL/MI
    Posts
    4,086

    Default Re: Vault construction details

    I have searched the internet but have not found what I am looking for.
    Do any of you know the construction requirements for underground vaults for utility companies.
    In particular:
    Is a Drain required?

    It Depends. (presuming this isn't a POCO building/facility).

    Inside or outside the building.

    The total KVA transformer capacity in the vault. The nominal voltage.

    Type of transformer(s) in the vault.

    Local conditions & practicality

    NESC + NEC +Local Requirements (POCO & AHJ) + Insurance (Bldg) underwriting requirements

    Pre 2002 NEC article was 450 plus requirements in NESC.

    Some good (but dated) stuff on ecmweb dot com.

    Here's a link to a searched list of reading materials some of which you may find informative:

    Search | Electrical Construction & Maintenance (EC&M) Magazine

    HTH

    Last edited by H.G. Watson, Sr.; 09-14-2013 at 11:06 PM.

  3. #3
    Join Date
    Dec 2009
    Location
    Florida
    Posts
    552

    Default Re: Vault construction details

    Quote Originally Posted by Rick Cantrell View Post
    I have searched the internet but have not found what I am looking for.
    Do any of you know the construction requirements for underground vaults for utility companies.
    In particular:
    Is a Drain required?
    A quick solution is to get friendly with the local power company engineering department. They will be happy that someone wants to talk to them about their job, and they will give you their requirements for vaults with a lot of background information. After all, if they don't like it---they won''t use it.

    Sometimes it's easier to ask someone that uses or does whatever, then to reinvent the wheel yourself.


  4. #4
    Join Date
    Mar 2012
    Location
    Ben Lomond, CA
    Posts
    71

    Default Re: Vault construction details

    Here in central California the vault is the jurisdiction of PG&E which has it's own code. Here the green book. They have always provided me a copy when I have needed it. Call the local utility.


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