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Thursday, December 11th, 2025 7:23 PM

cable clearances from structures

I am an architect designing dwelling units on a lot in Seattle. The Comcast internet cable is right on the rear property line at the alley. What horizontal clearance is required between the cable and a proposed building?

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user_3gw8jz - Thank you for joining the Xfinity Forum Community. Great question, thank you for asking. 

Over roads, streets, alleys; nonresidential driveways; parking lots and other areas subject to traffic = 18 feet clearance.

Over residential driveways
a) Subject to traffic = 15.5 feet clearance.
b) Residential driveways not subject to truck traffic or where attachment to the structure does not permit service drops to meet (a) above = 11.5 feet.
 
Above sidewalks or other pedestrian traffic areas = 10 feet clearance.
 
Above Roofs
a) Above roofs not accessible to pedestrians = 3 feet clearance.
b) All points above a flat roof = 10.5 feet clearance.

Please let me know if this info was helpful.

 

(edited)

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