The requirements of a suitable metallic conductor in a cathodic protection system are discussed. Particular attention is paid to economic factors and power loss in the selection of suitable conductors and the most satisfactory cable sizes. Data are given to show the relative electrical resistivity of copper, aluminum, iron and lead.
The selection of cable insulation and protective coverings in cathodic protection systems is discussed in detail. Data are given to show physical and accelerated aging requirements of polyethylene insulation and polyvinyl chloride sheath compound. Data also are included show the electrical stability of various types of insulation after immersion in tap water, and after immersion in various chemicals. Other topics discussed include mechanical properties of insulation, insulation versus environment, installation techniques and splicing requirements.
It was found that a cable construction which makes use of a polyethylene insulation and a polyvinyl chloride sheathing compound has the best combination of properties for use in cathodic protection. 5.2.1
