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Thread: red concrete

  1. #1
    Join Date
    Oct 2004
    Posts
    3

    red concrete

    :confused: what section if any states that in duct banks you must use red concrete?

  2. #2
    Join Date
    Apr 2004
    Location
    Mission Viejo, CA
    Posts
    3,868

    Re: red concrete

    There is none.
    "Bob"
    Robert B. Alexander, P.E.
    "I know that you believe you understand what you think the NEC says, but I am not sure you realize that what you read is not what it means." (Corollary to Charlie's Rule)

  3. #3
    Join Date
    Feb 2003
    Location
    Plano, TX
    Posts
    3,739

    Re: red concrete

    Originally posted by dmwyatt:
    :confused: what section if any states that in duct banks you must use red concrete?
    What are you talking about? :confused: I have seen some local codes that require certain service use color coded duct, but there is no NEC requirement.

    [ October 14, 2004, 03:57 PM: Message edited by: dereckbc ]

  4. #4
    Join Date
    Feb 2003
    Location
    Massachusetts
    Posts
    47,001

    Re: red concrete

    On the jobs I am on it is often in the job specifications to use red dye for concrete duct banks.

    We order normal concrete let it get poured then just fling out the dye on top of the wet concrete. We use a stiff broom to brush it in, it works great.

    The dye is cheap, a couple of bucks for a 5 lb bag, get it at a masonry supply house. Wear gloves when handling it unless you want red hands for a long time.

  5. #5
    Join Date
    Sep 2004
    Posts
    388

    Re: red concrete

    NEC does not require red concrete but we always use it for medium voltage duct banks & sometimes for very critical 480v. duct banks (like fire pumps).

    We have used the dusting method with dye, but much preferred is to add it to the slurry while it is still in the truck. So what if truck driver has to wash truck out more thorough than usual.

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