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  1. #1

    Default Smoke detectors on AFB protected circuit

    Did a new construction today. The smoke and CO detectors were wired on an arc fault protected circuit. This can't be right, can it?

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  2. #2
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: Smoke detectors on AFB protected circuit

    Quote Originally Posted by Ernie Simpson View Post
    Did a new construction today. The smoke and CO detectors were wired on an arc fault protected circuit. This can't be right, can it?
    Yes, it is correct.
    Newer codes require outlets to be arc fault protected, even smoke detectors.
    Think of this
    When there is an arc fault on that circuit the arc fault will trip. Since the arc fault tripped, there is no power to the circuit and therefore less chance of a fire. But since the smoke detector has battery backup the smoke detector still works.
    This is a nearly perfect plan.

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

  3. #3
    Join Date
    Aug 2008
    Location
    Maryland
    Posts
    1,899

    Default Re: Smoke detectors on AFB protected circuit

    It is required by the NEC since shortly after 2000.

    All answers based on unamended National Electrical codes.

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