Installation Practices
Pathways and support
Horizontal cable must be supported at intervals not exceeding about 5 ft (1.5 m); use J-hooks or cable tray, never staples, electrical conduit, or ceiling-grid wires. Conduit fill should not exceed 40 percent. Maintain separation from power conductors-commonly 12 in for unshielded cable, more for higher voltage or parallel runs-or use a barrier. Firestop every penetration of a rated wall or floor.
Bend radius and tension
Respect minimum bend radius: roughly 4× the cable diameter for copper and 10× for fiber during installation (fiber installed radius is often 10×, with tighter limits during pulling). Pulling tension for 4-pair copper is commonly limited to 25 lbf (about 110 N). Avoid kinks, sharp bends, and cable ties cinched tight; use hook-and-loop where possible.
Work area and administration
Leave slack at the telecommunications room and a service loop at the outlet; label both ends per TIA-606 and record the cable in the administration system. Terminate with the correct jacket strip length and untwist no more than about 0.5 in (13 mm) at Cat 6/6A to preserve performance.
Traps
Confusing support spacing with bend radius; assuming metal conduit is an acceptable pathway for data; and forgetting that firestopping and labeling are part of the installation, not extras.
Worked example
A cable with a 0.25 in diameter needs a minimum bend radius of 4 × 0.25 = 1 in during installation. If a pull requires more than 25 lbf, stop and use a pulling lubricant or a different route.