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Definitions in BS 215 Part 1: 1970 for ACSR Conductor

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Stranded conductor: a conductor consisting of seven or more aluminum wires of the same nominal diameter twisted together in concentric layers. When the conductor consists of more than one layer, successive layers are twisted in opposite directions diameter the mean of two measurements at right angles taken at the same cross section.

Direction of lay: the direction of lay is defined as right-hand or left-hand. With right-hand lay, the wires conform to the direction of the central part of the letter Z when the conductor is held vertically. With left-hand lay, the wires conform to the direction of the central part of the letter S when the conductor is held vertically.

Lay ratio: the ratio of the axial length of a complete turn of the helix formed by an individual wire in a stranded conductor to the external diameter of the helix.

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