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  1. #1
    Join Date
    Mar 2008
    Location
    Brea, Ca.
    Posts
    33

    Default Service drop clearance

    Does the minimum 3ft clearance rule apply (roof is greater than 4:12 pitch) when the SE passes over other portions of the hip roof? The actual position of the mast is within 4ft of the roof edge. Note: The attached picture does not show the "sag" very well in the SE but it is below 18 inches at the ridge cap.

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

    Default Re: Service drop clearance

    2006 IRC
    E3504.2.1 Above roofs.
    Conductors shall have a vertical
    clearance of not less than 8 feet (2438 mm) above the roof
    surface. The vertical clearance above the roof level shall be
    maintained for a distance of not less than 3 feet (914 mm) in
    all directions from the edge of the roof. See Figure
    E3504.2.1.

    Exceptions:
    1. Conductors above a roof surface subject to pedestrian
    traffic shall have a vertical clearance from the
    roof surface in accordance with Section
    E3504.2.2.
    2. Where the roof has a slope of 4 inches (102 mm) in
    12 inches (305 mm), or greater, the minimum
    clearance shall be 3 feet (914 mm).
    3. The minimum clearance above only the overhanging
    portion of the roof shall not be less than 18
    inches (457 mm) where not more than 6 feet (1829
    mm) of conductor length passes over 4 feet (1219
    mm) or less of roof surface measured horizontally
    and such conductors are terminated at a
    through-the-roof raceway or approved support.
    4. The requirement for maintaining the vertical clearance
    for a distance of 3 feet (914 mm) 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.


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

  3. #3
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    2,481

    Default Re: Service drop clearance

    OK, so in English...

    Assuming that the service drop approaches the house at 90 degrees and the roof slope is greater than 4:12, the service mast can be no more than 4 feet in from the edge of the eave, unless the cables are more than 8 feet high.

    Did I get that correct?

    This one has always confused me and sometimes I cannot digest the code.

    Department of Redundancy Department
    http://www.FullCircleInspect.com/

  4. #4
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: Service drop clearance

    "Did I get that correct?"

    Kinda, sorta.

    Must be 8',

    Execpt that 3' is allowed but ONLY when
    Pitch =>4/12
    AND mast is <4' from edge,
    AND SE cable over roof is <6'.

    Forget the 90deg thing.

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

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