Service Mast Height Above Roof

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.

Service mast height above roof.

Rigid galvanized steel conduit and roof plate conduit sizes. 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. 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. Flat roofs need to have at least 8 feet of clearance and balconies need at least 10 feet of clearance.

Most utilities will require bracing or guy wires for additional support of any mast that is taller than 3 feet. 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. As the guidelines include 8 10 ft above any flat roof and no less than 24 above a gable roof at the mast head your cables are too close to the gutters. 3 inch for 350 conductors 300 amp loop.

2 inch for 2 conductors 100 amp loop. 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. 2 inch for 4 0 conductors 200 amp loop.

The addition makes the mast less than 1 foot near the new gutter of the roof. 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.