Optical fibers require special care during installation to ensure reliable operation. Installation guidelines regarding minimum bend radius, tensile loads, twisting, squeezing, or pinching of cable must be followed. Cable connectors shoul. Optical fibers require special care during installation to ensure reliable operation. Installation guidelines regarding minimum bend radius, tensile loads, twisting, squeezing, or pinching of cable must be followed. Cable connectors should be protected from contamination and scratching at all times. Violation of any of these parameters causes incre. Make sure you check the installation instructions of the module for the appropriate cable lengths to ensure proper operation. You may experience additional attenuation loss when using bulkhead connectors to join cables even when the total length is less than maximum. Care should be used in maintaining total attenuation budget when joining cables wi. Exceeding the bend radius of the cable can cause unseen damage to the fibers of the cables that may not manifest itself for a period of time. This can lead to an expensive restringing of cables at a later date. See the cable specification tables later in this manual for appropriate bend radii for each catalog number. Figure 1 Correct Bend RadiusUse proper pulling techniques in laying out your cable. Putting twists in the cable greatly increases your chances of breaking the fibers.The Hubbell OPTISOK, Kellems Fiber-Optic Pulling grip.