UL 4:2018-02 Armored Cable.
1.1 These requirements cover interlocked steel or aluminum armored cables that contain 2, 3, or 4, 14— 1 AWG insulated circuit conductors with or without grounding conductors and are for use as Type AC
Armored Cable in accordance with Article 320 and other applicable parts of the National Electrical Code
1.2 These requirements cover cables for use at potentials of 600 V or less and at temperatures that are not higher than 75°C (1 67°F) for Type ACTH, or 90°C (1 94°F) for Types ACHH and ACTHH, depending upon the temperature rating of the insulated conductors used. Cables with aluminum armor are suitable only for use with connectors other than the direct-bearing set-screw type and only in alternating-current circuits.
2 References
2.1 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.
2.2 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).
3 Units of Measurement
3.1 In addition to being stated in the inch/pound units that are customary in the USA, each of the requirements in this standard is also stated in units that make the requirement conveniently usable in countries employing the metric system (practical SI). Equivalent — although not necessarily exactly identical — results are to be expected from applying a requirement in USA or metric terms. Equipment calibrated in metric units is to be used when a requirement is applied in metric terms.
3.1 revised October 16, 2008
4 Materials
4.1 Each material used in an armored cable shaH be compatible with au ot the oilier materials usea in the cable.
5 Conductors
5.1 General
5.1.1 Only copper, copper-clad aluminum, or an acceptable aluminum alloy shall be used for the conductors in a cable. Soft-annealed copper shall comply with the American Society for Testing and Materials Standard Specification for Soft or Annealed Copper Wire, ASTM B 3. Solid 12 — 8 AWG aluminum conductors shall comply with the requirements for aluminum-wire stock (aluminum-alloy conductor material). All aluminum conductors shall comply with the requirements for semi-annealed 8000 series conductors in Section 10 of UL 1581. Copper-clad aluminum conductors shall comply with the requirements for copper-clad aluminum conductors in Section 11 of UL 1581. In a given cable, all conductors need not be of the same metal.
5.1.1 revised October 16, 2008
5.1.2 A copper conductor shall not be smaller than 14 AWG and shall not be larger than 1 AWG. An aluminum or copper-clad aluminum conductor shall not be smaller than 12 AWG and shall not be larger than 1 AWG.
5.1.3 Each 6 — 1 AWG conductor shall be stranded. Conductors shall comply with the requirements in the Standard for Thermoset-Insulated Wires and Cables, UL 44, or in the Standard for ThermoplasticInsulated Wires and Cables, UL 83, except as modified in this Section.UL 4 pdf download.