Service Mast Height Above Roof

The service mast should not be more than 3 feet vertically above the roof line.

Service mast height above 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. 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. One of the exceptions is the most common type of residential overhead electric service type so we will start with it. 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. Thru roof mast type overhead service combination entrance type 120 240 volt single phase 100 amp 200 amp 300 amp consumer to provide and have installed 1. For underground service the poured footing must be notched out for the conduit. 2 inch for 2 conductors 100 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. 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. 2 inch for 4 0 conductors 200 amp loop. 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.

3 inch for 350 conductors 300 amp loop. The addition makes the mast less than 1 foot near the new gutter of the roof.