Service Mast Height Above Roof

2 inch for 4 0 conductors 200 amp loop.

Service mast height above roof.

On 2018 04 12 by willie i have added on to a house with overhead service. Flat roofs need to have at least 8 feet of clearance and balconies need at least 10 feet of clearance. 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. 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.

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. 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. 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. 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.

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. Most utilities will require bracing or guy wires for additional support of any mast that is taller than 3 feet.