Note 1 to entry: Core cables can be of the following types:

- equal lay cable, in which all layers have a common length of lay the direction of which is reversed in successive layers,

- parallel core cable, in which cable is constructed with a central core of parallel-laid wires surrounded by one layer of helically laid wires,

- unidirectional cable, in which all layers have a common direction of lay, with increase in length of lay for each successive layer,

- unilay cable, in which all layers have a common length and direction of lay.

Note 2 to entry: This entry was numbered 815-13-12 in IEC 60050-815:2015