Foreword?IEEE Std 1137-1991 provides guidance for controlling or modifying the inductive environment and the susceptibility of affected wire line telecommunications facilities in order to operate within the acceptable levels of steady-state or surge induced voltages of the environmental interface (probe wire) defined by IEEE Std 776-1987. Procedures for determining the source of the problem are given. Mitigation theory and philosophy are discussed@ and mitigation devices are described. The application of typical mitigation apparatus are addressed. Advice for determining the best engineering solution is offered@ and general safety considerations are discussed.This document was suggested during the preparation of IEEE Std 776-1987 as a companion in the area of implementing mitigating techniques. The following individuals made a significant contribution to the effort.David BoneauChrys ChrysanthouRuss GundrumHarold HeldRon JonesBill McCoyCharlie NelsonDick NelsonStan OverbyKeith SabineThis guide was prepared by the working group on Longitudinal Induction of the Transmission Systems Committee of the Communications Society. At the time this guide was approved@ the members of the working group were:David Lee Boneau@ ChairG.Y.R. AllenJ.E. AllisonC. ChrysanthouW. DabiszaJ.S. GallatinR.F. GundrumC.D. HansellD.P. HartmannW.M. Haynes@ Jr.H.C. HeldR.G. JonesJ.F. LaidigW.J. McCoyC.R. NelsonR.E. NelsonH.E. NerhoodS.D. OverbyP.E. PoolK.H. SabineM.S. TibenskyJ. ThorsonR.G. WunderL.S. YoungThe following persons were members of the ICEP Subcommittee@ who balloted this approved document for submission to the IEEE Standards Board:H. E. Nethood@ ChairG. Y. R. AllenJ. AllisonM. J. AnnaD. B. AnoiaD. L. BoneauC. ChrysanthouW. DabiszaJ. S. GallatinR. F. GundruaC. D. HansellDr. D. P. HartmannW. M. Haynes@ Jr.H. C. HeldR. IrvineR. G. JonesG. H. KuhnJ. F. LaidigE. B. LeeW. J. McCoyDr. A. P Sakis MeliopoulosC. R. NelsonR. E. NelsonS. D. OverbyL. J. PerfeckyP. E. PoolK. H. O. SabineF. A. SchuenemanS. A. SeboJ. M. Thorson Jr.M. S. TibenskyW. B. WilkensR. G. WunderL. S. YoungWhen the IEEE Standards Board approved this standard on September 26@ 1991@ it had the following membership:Marco W. Migliaro@ ChairDonald C. Loughry@ Vice ChairAndrew G. Salem@ SecretaryDennis BodsonPaul L. BorrillClyde CampJames M. DalyDonald C. FleckensteinJay Forster *David F. FranklinIngrid FrommThomas L. HannanDonald N. HeirmanKenneth D. HendrixJohn W. HorchBen C. JohnsonIvor N. KnightJoseph Koepfinger?*Irving KolodnyMichael A. LawlerJohn E. May@ Jr.Lawrence V. McCallT. Don Michael *Stig L. NilssonJohn L. RankineRonald H. ReimerGary S. RobinsonTerrance R. Whittemore* Member EmeritusAlso included are the following nonvoting IEEE Standards Board liaisons:Fernando AldanaSatish K. AggarwalJames BeallRichard B. EngelmanStanley WarshawDeborah CzyzIEEE Standards Project Editor ScopeThis Guide offers users assistance in controlling or modifying the inductive environment and the susceptibility of affected wire-line telecommunications facilities in order to operate within the acceptable levels of steady-state or surge-induced voltages of the environmental interface (probe wire) defined by IEEE Std 776-1987 [4]1. The methodology@ application@ and evaluation of results for mitigative techniques or devices in general are addressed for all Specific Type A and Specific Type B coordination methods also defined by IEEE Std 776-1987 [4].