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Thread: Greenfield vs. Flex conduit

  1. #1

    Greenfield vs. Flex conduit

    What is the difference between these two types of conduit? Can you use the same fittings for both?

  2. #2
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    As far as I am aware, "Greenfield" is a trade term for flexible metal conduit, so greenfield and flexible metal conduit are the same thing. This is like asking if I can use a "romex" connector for nonmetallic sheathed cable.

    Chris

  3. #3
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    I agree with Chris. Greenfield = FMC. Just like calling a Ryobi hand held reciprocating saw a Sawzall (registered name by Milwaukee Electric Tools).
    Another Al in Minnesota

  4. #4
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    In some areas, the steel version is called Greenfield and the ALM version is called flex.

    Why? I don't know, 1ST Base!
    Unlimited Electric Contractor/Standard Electric Inspector/Traffic Signal Inspector/Highway Lighting and Level One Traffic Signal Installer.

    I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.

  5. #5
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    Quote Originally Posted by martinvalley View Post
    What is the difference between these two types of conduit? Can you use the same fittings for both?
    As I recall, the original version of Greenfield "cable", circa 1920, was the forerunner of BX, and more modern AC, and MC, as it was furnished with wire already in it. It resembled more so FMC with wire in it than the more tightly wrapped BX.

    http://www.bejane.com/electricity_101
    Last edited by Smart $; 08-06-09 at 02:13 PM.

  6. #6
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    I reckon it is like trying to define pornography......Don't know untill I see it.
    Greg

    Electrical Inspector in our Nations Capital

  7. #7
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    Actually Greenfield was always just flexible conduit and goes back to 1902 it got it's name from the inventor.



    Excerpt from this article



    When you decide to use "Greenfield" on the job you are really dating yourself, so I would just call it "flex". It was invented in 1902 by Harry Greenfield and Gus Johnson and when it was listed by Sprague Electric Co. it was called "Greenfield flexible steel conduit". Today the term "Greenfield" is commonly used for all FMC (flexible metal conduit-NEC Art. 348). FMC is also manufactured in both aluminum and steel. The NEC defines FMC as "A raceway of circular cross section made of helically wound, formed, interlocked metal strip."



    Roger
    Moderator

  8. #8
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    Martin,

    What kind of Sales Manager are you?

    Are you in the electrical field?

    What do you mean by "Flex"? Are you refering to FMC (Flexible Metallic Conduit) or are you refering to ENT (Electrical Non-metallic Tubing, the blue stuff)?

    I will assume (uh oh!) you are not refering to flexible liquidtight.

    Some places call ENT "flex".
    Last edited by cycotcskir; 08-06-09 at 03:39 PM.
    Humility is that ever elusive state. Once you think you've finally got it, you just lost it.

  9. #9
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    Quote Originally Posted by cycotcskir View Post
    Martin,

    What kind of Sales Manager are you?

    Are you in the electrical field?

    What do you mean by "Flex"? Are you refering to FMC (Flexible Metallic Conduit) or are you refering to ENT (Electrical Non-metallic Tubing, the blue stuff)?

    I will assume (uh oh!) you are not refering to flexible liquidtight.

    Some places call ENT "flex".
    That was the reason or intent of my post #6 Way too many people use field slang and not the actual terminology.
    Greg

    Electrical Inspector in our Nations Capital

  10. #10
    Join Date
    Apr 2007
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    OHIO
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    Glad they went with flexible Greenfield rather than flexible Johnson......:rolleyes:
    Let me drop everything and work on your problem!!!

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