Page 7 - OSP Fiber Optic Cable Installation - Underground and Aerial Applications

Recommend smooth-wall or ribbed innerduct (not corrugated)
Larger diameter innerduct may be required for cable blowing

Distribution networks: minimum ID = 1.25 inches
Innerduct I.D. Innerduct I.D. Cable O.D. Cable O.D.
Long haul networks: minimum ID = 1.5 inches

Underground installation (innerduct in conduit)

= Diameter Ratio = Diameter Ratio

0.67 Cable OD Cable OD Innerduct ID Innerduct ID

Innerduct Diameter Ratio ≤ Direct buried installation

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