UL 1063:2017 Machine-Tool Wires and Cables.
2 Units of Measurement
2.1 When a value for measurement is followed by a value in other units in parentheses, the second value may be only approximate. The first stated value is the requirement.
3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be
interpreted as referring to the latest edition of that code or standard.
4.1 Wherever the designation “UL 1581” is used in this wire standard, reference is to be made to the designated part(s) of the Reference Standard for Electrical Wires, Cables, and Flexible Cords (UL 1581).
5.1.1 Each material used in a machine-tool wire or cable shall be compatible with all of the other materials used in the wire or cable.
5.2.1 Wherever “PVC” appears in these requirements the intention is to designate a synthesized compound whose characteristic constituent is polyvinyl chloride or a copolymer of vinyl chloride and vinyl acetate.
6.1.1 Each conductor shall be only of stranded soft-annealed copper with or without continuous coating of tin or a tin/lead alloy applied before the conductor is stranded or insulated.
6.2.1 Conductors shall not be smaller than 22 AWG and shall not be larger than 1000 kcmiL
6.2.2 The size of each conductor shall be verified either by determination of the d-c resistance or by determination of the cross-sectional area as described in 6.6.1. Determination of the conductor size by measurement of the direct-current resistance as described in 6.7.1 is the referee method in all cases.
6.3 Number and assembly of strands and conductor diameters
6.3.1 Conductors shall be stranded with at least the number of strands indicated in the applicable Table
6.5, 6.6, or 6.7. A 19-wire combination round-wire unilay-stranded soft-annealed copper conductor shall be round and shall consist of a straight central wire, an inner layer of six wires of the same diameter as the central wire with the six wires having identical lengths of lay, and an outer layer consisting of six wires of the same diameter as the central wire alternated with six smaller wires having a diameter of 0.732 times the diameter of the central wire and with all twelve wires of the outer layer having the same length of lay and direction of lay as the six wires of the inner layer. Otherwise, no particular assembly of the individual strands is required; however, untwisted strands shall not be used for the entire conductor or any part thereof. Class B or C 16 AWG — 1000 kcmil conductors shall be with or without compressed strands. Compressed stranding shall not be used in the Size 22-7 or in the Class K and M constructions. Otherwise, any stranding other than single-bunch, bunch stranding and the concentric, rope-lay, and 19-wire combination unilay assemblies indicated in Tables 6.5, 6.6, and 6.7 shall not be used unless the results of an evaluation demonstrate that the stranding is appropriate for the application. Compact stranding shall not be used.UL 1063 pdf download.