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NACE Standard RPOl77-2000 Item No. 21021

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Standard Recommended Practice Mitigation of Alternating Current and Lightning Effects on Metallic Structures and Corrosion Control Systems
This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance doesnot in any respect preclude anyone, whether he has adopted the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not in conformance with this standard. Nothing contained in this NACE International standard is to beconstrued as granting any right, by implication or otherwise, to manufacture, sell, or use in connection with any method, apparatus,or product covered by Letters Patent, or as indemnifying or protecting anyone against liability for infringement of Letters Patent. This standard represents minimum requirements and should in no way be interpreted as a restriction on the use of better procedures or materials. Neither is this standard intended to apply in all cases relating to the subject. Unpredictable circumstances may negatethe usefulness of thisstandard in specific instances. NACEInternationalassumesno the interpretation or use of this standard by other parties and accepts responsibility for responsibilityonly official International for those NACE interpretations issued by NACE International in accordance with its governing procedures and policies which preclude the issuance of interpretations by individualvolunteers. Users of this NACE International standard are responsible for reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE International standard may not necessarily address allpotential health andsafetyproblems or environmental hazards associatedwith the use of materials, equipment,and/or operations detailed or referred to within this standard. Users of this NACE International standard are also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation appropriate with regulatory authorities if necessary, to achieve compliance with any existing applicable regulatory requirements prior to the use of this standard. aresubject to periodic review, and may CAUTIONARY NOTICE: NACE International standards be revised or withdrawn at any time without prior notice. NACE International requires that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of initial publication. The user is cautioned to obtain the latest edition. Purchasers of NACE International standards mayreceive current information on all standards and other NACE International publications by contacting the NACE International Membership Services Department, 1440 South Creek Drive, Houston, Texas 77084-4906 (telephone +1 [281]228-6200). Reaffirmed 2000-09-1 9 Approved July 1977 Revised July 1983 Revised March 1995 NACE International 1440 South Creek Drive Houston, Texas 77084-4906 + 1 (281) 228-6200ISBN 1-57590-1 16-1 82000, NACE International

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RPOl77-2000

Foreword
This standard recommended practice presents guidelines and procedures for use during design, construction, operation, andmaintenance of metallicstructuresandcorrosioncontrolsystems used to mitigate the effects of lightning and overhead alternatingcurrent (AC) power transmission systems. This standard is not intended to supersede or replace existing electrical safety standards. As shared right-of-way utility and corridor practices become morecommon, AC influence on adjacent metallic structures has greater significance and personnel safety becomes of greater concern. This standard addresses problems primarily caused by proximity of metallic...