UL Standard for Safety Medium-Voltage Power Cables
|Publication Date:||30 June 2006|
These requirements cover the shielded and nonshielded medium-voltage power cables that are described in Table 1.1 (single-conductor) and Table 1.2 (multiple-conductor)
These cables have one or more stranded copper or aluminum conductors that are insulated with a solid, extruded dielectric. Cables that have a metal sheath or interlocked armor incorporate an effective grounding path. A grounding conductor is optional in other cables. Cables for direct burial are so marked and have an overall covering (see 1.4 for direct-burial cables that are not covered). Cables that are for use in cable trays generally are so marked (see 62.1 and 62.2). Cables that are sunlight-resistant generally are so marked (see 64.1 - 64.3). Cables that are marked "MV-90" or "MV-90 dry" have a maximum operating temperature of 90°C (194°F). Cables that are marked "MV-105" have a maximum operating temperature of 105°C (221°F) for use where design conditions require a maximum conductor temperature above 90°C (194°F). Cables that are marked "dry" have insulation for use only in dry locations. All other cables have insulation that is for use in both wet and dry locations. Multiple-conductor cables that include one or more optical-fiber members are surface marked to so indicate. Cables that are marked "oil resistant II" are for exposure to mineral oil at temperatures not in excess of 75° C (167° F). Cables that are marked "oil resistant I" are for exposure to mineral oil at temperatures not in excess of 60°C (140°F).
A multiple-conductor Type MV cable that has a smooth (other than lead) or corrugated metal sheath or that has interlocked metal armor may be marked for use also as Type MC cable.
This standard does not include requirements for cables with concentric neutral conductors. However, it is possible to have a single-conductor cable with a concentric neutral conductor manufactured in accordance with the requirements of other standards, that meets the requirements for jacketed singleconductor shielded cable in this standard.