W-44 Kellems® Wire Management Products Wiring Device-Kellems ® www.hubbell.com/wiringdevice-kellems/en Kellems has wide experience with grips for use with fiber optic cable. As the industry leader in producing wire mesh grips for the stringent requirements of fiber optic applications, Kellems has developed several series of grips for use with fiber optic communications cable. These grips include pulling grips with built in swivels, grips with steel ends to protect fragile cable ends, grips with low profiles to pull cables in tight places and the OPTISOK® an effective tool to place pre- terminated cables. Also available are grips to support fiber optic cable. Examples Approx. Breaking Safety Max. Recommended Grip Style Strength Lbs. (N) Factor Load Lbs. (N) Catalog Number Pulling Grips 2,500 (11,120) 5 500 (2,224) 033291196 Support Grips 400 (1,779) 10 40 (178) 022291004 The maximum recommended working load is the tension to be exerted on the grip in application with a margin of safety to take care of unforeseen and unusual circumstances. It is the end-user’s decision to determine how much of a safety factor is acceptable to for the application. Fiber Optic Grip Materials Material Features Product Group Galvanized steel wire • High strength • Pulling grips • Not subject to continuous outside environment Tin-coated bronze wire • Corrosion resistant for normal outside areas • Support grips • Non-magnetic • Moderate strength Non-metallic braid • Superior flex life • OPTISOK® • Non-conductive • Corrosion resistant • Moderate strength Approvals CSA Certification is indicated on appropriate product catalog pages. The broad application of Kellems grips on a wide variety of objects requires that adequate safety factors be used to establish working loads. The approximate breaking strength of a Kellems grip represents an average calculation based on data established from actual direct tension testing done in our engineering laboratories. It is impossible to catalog or guarantee a safety factor suitable for all applications as operating conditions are never the same. The tension, diameter, movement, number of objects gripped, gripping surface, and the attachments used are just some of the factors which vary with each application. These factors, together with the effects of abrasion, corrosion, prior use or abuse and any other variables of a specific application, must be considered by the user and the grip replaced as appropriate. Where the conditions of the application are not well defined or known or where risk of injury to persons or property is involved, a greater safety factor should be utilized. IMPORTANT: Under normal conditions, Kellems’ recommended factor of safety is five for catalog listed pulling grips, and ten for catalog listed support grips. Any warranty as to quality, performance or fitness for use of grips is always premised on the condition that the published breaking strengths apply only to new, unused grips, and that such products are properly stored, handled, used, maintained and inspected by the user at a frequency appropriate for the use and condition of the grip. For grip applications on materials other than those that the grips have been specifically designed for, consult the factory. Safety And Working Load Factors For Wire Mesh Grips Select the Correct Fiber Optic Grip Each Kellems grip is designed to work on a specific range of cable diameters. Step 1 Determine your cable outside diameter. Step 2 Find the grip size that encompasses your cable diameter. Step 3 Whenever possible, use a closed mesh that assembles over the cable end. If the cable end is not available, use a split mesh. Step 4 Where available, select an eye style that suits your needs. Step 5 Estimate the tension to be put on the grip, establish the working load you require and compare this to the listed approximate breaking strength of the grip to insure that the grip will be strong enough.
