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Thread: drain in eletrical vault

  1. #1
    Join Date
    Aug 2008
    Posts
    127

    drain in eletrical vault

    The owner wants me to install electrical equipment in a small underground vault. There is no drain and no sump for a sump pump. The only place I can find that addresses floor drains is 450.46 for a vault containing more than 100kVA of transformer capacity and 680.11. Is there anywhere that requires a drain?

  2. #2
    Join Date
    Oct 2006
    Location
    Litchfield, CT
    Posts
    8,622
    Quote Originally Posted by wyboy View Post
    The owner wants me to install electrical equipment in a small underground vault. There is no drain and no sump for a sump pump. The only place I can find that addresses floor drains is 450.46 for a vault containing more than 100kVA of transformer capacity and 680.11. Is there anywhere that requires a drain?
    Common sense?
    "Electricity is actually made up of extremely tiny particles called electrons, that you cannot see with the naked eye unless you have been drinking."

  3. #3
    Join Date
    Feb 2003
    Location
    Bremerton, Washington
    Posts
    6,631
    The electrical equipment has to be rated for the enviroment. Not sure what state you are in, but here a vault is damp or wet, so NEMA 4X, PVC is best. Also does this electrical equipment require working space? Then it could be a large vault with 6-6" min headroom.
    I have done a lot of concrete vaults. And gone back and wired for sump pumps. I like the precast concrete vaults with a small sump for the pump. I have also seen a lot of pumps fail, they last about ten years.
    Moderator-Washington State
    Ancora Imparo

  4. #4
    Join Date
    Sep 2004
    Location
    Vancouver, WA
    Posts
    660

    Failure guaranteed

    Electric utilities seldom install sump pumps in vaults because they are guaranteed to fail. Everything in their vault is rated for submersible use. If the equipment is not submersible rated, it should not be in a vault. However, you can prolong the life of some devices by pumping the water. Locate the sump pump where it is easily removed and use flexible cable and hose to allow lifting the pump out without entering the vault. Locate the disconnect where it is accessible or, if remote, make sure it is lockable.
    e^(i pi) = -1

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