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Thread: Class I Div 2 Boundary Seal

  1. #1
    Join Date
    Aug 2011
    Location
    NH
    Posts
    246

    Class I Div 2 Boundary Seal

    A factory sealed light fixture is mounted on the exterior of a building. The building interior is Div 2. Exterior is non-classified. The conduit supplying the fixture originates in the Div 2 area inside the building, goes through the exterior wall and directly to the fixture. Total distance is a few feet.

    - Even though the light is 'factory sealed' (and listed for Div 2), I believe NEC would still require a boundary seal - correct? I don't see a separate seal providing any practical benefit.
    - The conduit within the building originates from a cable tray drop. I don't think this changes anything but maybe.

  2. #2
    Join Date
    Jul 2015
    Location
    Soldotna, AK, USA
    Posts
    124
    Quote Originally Posted by nhee2 View Post
    A factory sealed light fixture is mounted on the exterior of a building. The building interior is Div 2. Exterior is non-classified. The conduit supplying the fixture originates in the Div 2 area inside the building, goes through the exterior wall and directly to the fixture. Total distance is a few feet.

    - Even though the light is 'factory sealed' (and listed for Div 2), I believe NEC would still require a boundary seal - correct? I don't see a separate seal providing any practical benefit.
    - The conduit within the building originates from a cable tray drop. I don't think this changes anything but maybe.
    Correct, if in fact there is a change. Look carefully some building prints have a bubble surrounding the building a few feet outside the walls.
    I would also make sure the cable is one that does not transmit gas, it has the same rules behind it. But may be used to seal a stripped cable and its individual conductors in the conduit seal.

    First I would ensure its not class1 div2.

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