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.

2 inch for 4 0 conductors 200 amp loop. Most utilities will require bracing or guy wires for additional support of any mast that is taller than 3 feet. The addition makes the mast less than 1 foot near the new gutter of the roof. One of the exceptions is the most common type of residential overhead electric service type so we will start with it.

On 2018 04 12 by willie i have added on to a house with overhead service. Rigid galvanized steel conduit and roof plate conduit sizes. 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. 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.

3 inch for 350 conductors 300 amp loop. For underground service the poured footing must be notched out for the conduit. 2 inch for 2 conductors 100 amp loop. 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.

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. 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.