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This European Standard specifies the general principles for the implementation of a system of cathodic protection against corrosive attacks on buried or immersed metal structures with and without the influence of external electrical sources. NOTE 1 The protection against stray current from direct current system influences is dealt in prEN 50162:2000. This standard indicates conditions and parameters that should be met to achieve cathodic protection as well as rules and procedures that should be followed for design, installation, commissioning and maintenance of the protective systems. NOTE 2 Clauses 5 to 10 deal mainly with the cathodic protection of pipelines but they are applicable to other structures This standard is applicable to external surfaces of buried or immersed structures. It is not applicable to the protection of internal parts of structures containing corrosive liquids. NOTE 3 This is covered by prEN 12499:1996. When cathodic protection is necessary, this standard is applicable to structures covered with concrete which are then buried or immersed. It is not applicable to the protection of steel in reinforced concrete which is buried or immersed. NOTE 4 This is covered by EN 12696 This standard is applicable only to those constructions in sea water for which the protective systems would be installed and can be inspected on land. NOTE 5 Such constructions in sea water are generally of smaller length, whether or not they form a part of a larger underground network. NOTE 6 Other constructions in sea water are dealt with in other standards, e.g. for submarine pipelines see EN 12473.