Service Mast Height Above Roof

On 2018 04 12 by willie i have added on to a house with overhead service.

Service mast height above roof.

The addition makes the mast less than 1 foot near the new gutter of the roof. 2 inch for 2 conductors 100 amp loop. In general overhead service conductors must maintain a minimum vertical clearance of 8 feet above the surface of a roof for a minimum distance of 3 feet in all directions from the edge of the roof 230 24 a. 2 inch for 4 0 conductors 200 amp loop.

The national electric code nec 230 24 a requires that overhead service wires conductors be a minimum of 8 feet above a roof including for a minimum 3 feet in all directions from the edge of the roof but then provides four allowable exceptions. Point of attachment on service conduit risers to be no more than 20 above the roof or parapet wall support for 1 1 2 rigid steel conduit no more than 30 above the roof or parapet wall support for 2 rigid steel conduit and no more than 50 above the roof or. The service mast should not be more than 3 feet vertically above the roof line. One of the exceptions is the most common type of residential overhead electric service type so we will start with it.

For underground service the poured footing must be notched out for the conduit. 3 inch for 350 conductors 300 amp loop. Rigid galvanized steel conduit and roof plate conduit sizes. Meter base mounted on exterior wall of house or mobile manufactured home for overhead service weather head must be a minimum of three feet above the roof.

Most utilities will require bracing or guy wires for additional support of any mast that is taller than 3 feet. Over a roof with 4 12 slope or more within 4 feet of roof edge at eaves c 18 inches above decks and balconies including out 3 feet g h 10 feet to the sides and below an openable window i 3 feet.