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Thread: NYC Pre-Action System

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    NYC Pre-Action System

    Anyone know if they have to be in RGS conduit by NYC code?

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    Ok, what's a Pre-Action system?

    -Hal

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    Quote Originally Posted by hbiss View Post
    Ok, what's a Pre-Action system?

    -Hal
    A type of sprinkler system that has supervisory air in the pipe and only allows water to flow into the pipe when the proper conditions activate, either detection (single interlock) OR detection & air exits the pipe (double interlock).

    NYC only allows single interlock.
    Ron

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    Quote Originally Posted by mstrlucky74 View Post
    Anyone know if they have to be in RGS conduit by NYC code?
    Yes, sort of but not exactly. You have a few other choices too. See NYC Electric Code Section 760.131(B) https://www1.nyc.gov/assets/building...rical_code.pdf
    Ron

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    Quote Originally Posted by ron View Post
    Yes, sort of but not exactly. You have a few other choices too. See NYC Electric Code Section 760.131(B) https://www1.nyc.gov/assets/building...rical_code.pdf
    Thanks

    Sent from my SM-N960U using Tapatalk

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    Quote Originally Posted by ron View Post
    A type of sprinkler system that has supervisory air in the pipe and only allows water to flow into the pipe when the proper conditions activate, either detection (single interlock) OR detection & air exits the pipe (double interlock).

    NYC only allows single interlock.
    Commonly called a dry system. There is an air compressor that keeps the piping charged with air.

    -Hal

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    Quote Originally Posted by hbiss View Post
    Commonly called a dry system. There is an air compressor that keeps the piping charged with air.

    -Hal
    Probably not worth arm wrestling about, but NFPA 13 defines them differently. Although pre-action systems normally have dry pipes in the protected area, it is different than a dry pipe system. A Pre-action system requires detection to activate.

    Technically there is such a thing as a non-interlock pre-action system that is essentially a dry pipe system, but nobody really goes through that listing process when a cheapo dry pipe system listing is easier and cheaper to get.
    Ron

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