Determination Of Maximum Safe Pulling Lengths For Solid Dielectric Insulated Cables

Under the auspices of the Electric Power Research Institute, Pirelli Cable Corporation, assisted by Georgia Power Company, performed an extensive investigation into the determination of maximum pulling lengths of current designs of extruded dielectric cables in ducts. Important parameters which can affect the pulling length, such as coefficients of friction, cable lubricants and tension and sidewall bearing pressure levels, were investigated. The results of the laboratory test program were verified and augmented by simulated field testing. The findings of this investigation were utilized in the preparation of a pulling guide to assist the cable engineer in the design of installations which are more reliable and economical than possible with present guidelines established over thirty years ago.