This paper discusses electrical tests made on representative sizes of single layer alminum conductors, steel reinforced with galvanized and heavy aluminum coatings. Analysis of 60-cycle a-c (alternating current) test data indicates that the conductors with aluminum-clad core wires than the same sizes of ACSR conductors in which the core wires are of galvanized steel. The differences are in the order of 4 to 10% less for resistance and 5 to 8% less for reactance. Because of this improvement in the electrical properties, single-layer ACSR conductors, having core wires with a heavy aluminum coating when used on transmission and distribution lines, will have less voltage drop and power losses, and the annual cost of line losses will be reduced.