TWISTED-PAIR CABLING INSTALLATION PRACTICES To avoid stretching, pulling tension should not exceed 110N (25 lb? for 4-pair cables. Installed bend radii shall not exceed: 4 times the cable diameter for horizontal UTP cables under no load conditions. 8 times the cable diameter for horizontal ScTP cables. 10 times the cable diameter for multi-pair backbone twisted-pair cables under no load conditions. Horizontal cables should be used with connecting hardware and patch cords (or jumpers) of the same performance category or higher. 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 Important Note: Installed twisted-pair cabling shall be classified by the least performing component in the link.