UL 758-2014 pdf download
UL 758-2014 pdf download.Appliance Wiring Material.
11 Shield(s)
11.1 A shield is not required; however, its use over an invidual conductor, over one or several groups of conductors with or without one or more optical-fiber members in each grotç. or over the entire cable assembly, is not prohibited. Several shields are not prohibited from being used In a given cable.
11.2 A shield may cons4st of a wire braid, wrap. serving, or metal tape.
11.3 A metal tape shall be applied helically or longitudinally with or without a drain wire. Uncoated copper or copper alloy drain wire is not acceptable to be in contact with an aluminum-faced tape.
11.3 effective September 3. 2014
11.4 A shield consisting of a metal faced paper or polyester tape shall be applied helically or longitudinally with or without a drain wire. Uncoated copper or copper alloy drain wire is not acceptable to be in contact with the aluminum surface of an aluminum-faced tape.
11 4 effective September 3. 2014
11.5 A shield consisting of a conductive polymeric layer shall have a volume resistivity not exceeding 50.000 ohm-centimeters at the rated temperature of the insulation and shall be provided with a drain wire or other means for teminahon. Wires or cables using conductive polymeric shields shall be marked in accordance with 50.3 and 51.2(k).
11.6 The details of the construction of a shield and the manner of its application are not specihed. There are no requirements for the electromagnetic performance of a shield.
11.7 A shield consisting of a wrap. serving, or tape shall not be the outermost covering on a wire unless the wire is intended to be jacketed, or provided with an outer covering, or the wrap or tape is bonded with adhesive or by heat. Wires using such a shield shall have an overall jacket or covering. A shield consisting of a wire braid or a conductive extrusion is not required to be covered.
11.8 A shield in the form of a wrap, tape or other containing polymeric materials and used as the outermost layer in a wire or cable construction shall be subjected to the same requirements as a non-extruded covering in Table 3.8, or a laminated cable in Table 3.5 for the shield over the laminated cable.
12 Cable Assembly
12.1 Insulated conductors wtth different temperature ratings that are mixed in a given cable complies with the intent of this requirement when the cable is rated for the lowest temperature rating of any of the constituent Insulated conductors. The insulated conductors shall not be marked with a temperature rating that is higher than that of the finished cable.
12.2 Insulated conductors with different voltage ratings that are mixed in a given cable complies with tIle intent of this requirement when the cable is rated for riot higher than the lowest voltage rating of any of the constituent insulated conductors. When the insulated conductors are marked with a voltage rating, the voltage rating shall be the same as that of the finished cabfe
122 ellective SeØember 3. 2014
12.3 In a given cable, all of the power conductors shall be of the same metal. Cables may contain conductors of different sizes and may contain precabled groups of conductors as described in 12,5.
12.4 In a cable with two conductors, the conductors and any grounding conductor may be either cabled (round) or laid parallel (flat cable).
12.5 The Circuit conductors in a round cable shall be cabled with a length of lay that Is unifomi throughout the length of the cable in compliance with Table 12.1. Grouping of the Circuit conductors into pairs. triads, quads. and other precabled subassemblies is not required.
