For Pt.I, see ibid., pp.835-841 (1991). In Pt.I, methods of testing to determine the overall condition of Ontario Hydro's overhead conductors were described. The analysis of the test results relative to estimated end-of-life values is presented. The remaining useful life of conductors can be estimated from the curves of progressive degradation. Air pollution studies have led to an environmental corrosion index, which has been correlated with remaining life based on the torsional ductility of steel core wires. This had been used to map expected conductor life across the province. The average service life is found to vary between 67 and 77 years depending on the local contamination level.
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