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Electronic Theatre Controls Inc

Unshielded Twisted Pair Cabling Installation Practices


  • To avoid stretching, pulling tension should not exceed 110N (25 lb ƒ ) for 4-pair cables.
  • Installed bend radii shall not exceed: 
    • 4 times the cable diameter for horizontal UTP cables.
    • 10 times the cable diameter for multi-pair backbone UTP cables.
  • Avoid cable stress, as caused by: 
    • cable twist during pulling or installation 
    • tension in suspended cable runs 
    • tightly cinched cable ties or staples 
    • tight bend radii
  • Horizontal cables should be used with connecting hardware and patch cords (or jumpers) of the same performance category or higher.

Important Note: Installed UTP cabling shall be classified by the least performing component in the link


  • Use connecting hardware that is compatible with the installed cable.
  • Terminate each horizontal cable on a dedicated telecommunications outlet.
  • Locate the main cross-connect near the center of the building to limit cable distances.
  • Maintain the twist of horizontal and backbone cable pairs up to the point of termination.
  • Tie and dress horizontal cables neatly and with a minimum bend radius of 4 times the cable diameter.
  • Place cabling at a sufficient distance from equipment that may generate high levels of electromagnetic interference.


  • Do not use connecting hardware that is of a lower category than the cable being used.
  • Do not create multiple appearances of the same cable at several distribution points (called bridged taps).
  • Do not locate cross-connects where cable distances will exceed the maximum.
  • Do not leave any wire pairs untwisted.
  • Do not over-tighten cable ties, use staples, or make sharp bends with cables.
  • Do not place cable near equipment that may generate high levels of electromagnetic interference.