This paper describes field and laboratory tests of ACSR conductors and related line items from many of Ontario Hydro's older transmission lines. A non-destructive corrosion detector was modified for live line measurement of the loss of galvanizing from the steel cores of the ACSR conductors. Samples of conductors tested in the field have also undergone laboratory metallurgical investigation, and tests of fatigue, tensile strength, torsional ductility and electrical performance. Extensive environmental studies identified corrosion products of ACSR conductors, the atmospheric factors responsible for corrosion, and the mechanisms by which corrosion takes place. It is concluded that the corrosion detector serves as a useful indicator of impending end of conductor life while the torsional ductility tests serve as a more precise condition indicator and can provide a guide for scheduling conductor replacement. Test results and details of their interpretation are given in the companion paper "Aged ACSR Conductors, Part I1 -Prediction of Remaining Life".

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