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  1. #1

    Default Service line over detached building

    This detached building was added under an existing service drop. I assume a clearance of 3' would be required. Is this correct?

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  2. #2
    James Duffin's Avatar
    James Duffin Guest

    Default Re: Service line over detached building

    230.24 Clearances.
    Service-drop conductors shall not be
    readily accessible and shall comply with 230.24(A) through
    (D) for services not over 600 volts, nominal.

    (A) Above Roofs.
    Conductors shall have a vertical clearance
    of not less than 2.5 m (8 ft) above the roof surface.
    The vertical clearance above the roof level shall be

    maintained for a distance of not less than 900 mm (3 ft)
    in all directions from the edge of the roof.
    Exception No. 1: The area above a roof surface subject to
    pedestrian or vehicular traffıc shall have a vertical clearance
    from the roof surface in accordance with the clearance
    requirements of 230.24(B).
    Exception No. 2: Where the voltage between conductors
    does not exceed 300 and the roof has a slope of 100 mm in
    300 mm (4 in. in 12 in.) or greater, a reduction in clearance
    to 900 mm (3 ft) shall be permitted.
    Exception No. 3: Where the voltage between conductors
    does not exceed 300, a reduction in clearance above only
    the overhanging portion of the roof to not less than 450 mm
    (18 in.) shall be permitted if (1) not more than 1.8 m (6 ft)
    of service-drop conductors, 1.2 m (4 ft) horizontally, pass
    above the roof overhang, and (2) they are terminated at a
    through-the-roof raceway or approved support.
    FPN: See 230.28 for mast supports.
    Exception No. 4: The requirement for maintaining the vertical
    clearance 900 mm (3 ft) from the edge of the roof shall
    not apply to the final conductor span where the service
    drop is attached to the side of a building



  3. #3
    Roger Frazee's Avatar
    Roger Frazee Guest

    Default Re: Service line over detached building

    Quote Originally Posted by Bob Ozbirn View Post
    This detached building was added under an existing service drop. I assume a clearance of 3' would be required. Is this correct?
    Bob

    Does it meet exception 2. Also the clearance above that detached building may change to more than minimums depending on the point of attachment to the service entrance of the building being served...ie...you have clearances that must be met between the detached building and the point of attachment. And you might even have to move the point of attachment vertically to maintain the necessary clearance over the detached building. Or you may have to involve the utility...


  4. #4

    Default Re: Service line over detached building

    I believe it would meet exception 2 thus the 3' however it is only 12" to 18" above the roof. What confused me was "the roof surface" since this was not the roof in question. Seems to me it should say any roof surface.


  5. #5
    Roger Frazee's Avatar
    Roger Frazee Guest

    Default Re: Service line over detached building

    Quote Originally Posted by Bob Ozbirn View Post
    I believe it would meet exception 2 thus the 3' however it is only 12" to 18" above the roof. What confused me was "the roof surface" since this was not the roof in question. Seems to me it should say any roof surface.
    Believe me I understand your confusion.....


    What you have isn't going to be acceptable. Some of the inspectors here can advise you how to call that out in your report ... I am assuming your doing an inspection. Give them some time they will be around to respond. I'm not a home inspector just a retired wireman.


  6. #6
    Join Date
    Mar 2007
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    Ormond Beach, Florida
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    26,248

    Default Re: Service line over detached building

    Quote Originally Posted by Bob Ozbirn View Post
    I believe it would meet exception 2 thus the 3' however it is only 12" to 18" above the roof. What confused me was "the roof surface" since this was not the roof in question. Seems to me it should say any roof surface.

    It should say "the roof surface" just as it does because it is referring to "the roof surface" you are measuring to.

    Not 'the roof surface' where the conductors originate, but *the roof surface* the conductors are over.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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