UL 1277 Electrical Power and Control Tray Cables with Optional-Fiber Members

standard by Underwriters Laboratories, 11/14/2001

Full Description

1.1 These requirements cover electrical power and control cablesconsisting of either two or more current-carrying copper, aluminum, orcopper-clad aluminum circuit conductors, or one or more pairs ofthermocouple-extension wires. Thermocouple-extension wires andcircuit conductors shall not be mixed in the same cable. These cablesare constructed with or without either or both:

1.One bare or one or more insulated grounding conductor(s), and
2.One or more individually jacketed optical-fiber members, all under an overall jacket.

These electrical and composite electrical/optical-fiber cables areintended for use (optical and electrical functions associated in the caseof a composite cable) in accordance with Article 336 and otherapplicable parts of the National Electrical Code (NEC), ANSI/NFPA70-2002 in cable trays, in raceways, and where supported in outdoorlocations by a messenger wire.

1.2 The conductors for these cables are described in Sections 8.2(NEC types) and 8.3 (other conductors). Cables are surface markedwith the conductor type letters and/or with the temperature and "wet","dry", or "wet or dry" ratings applicable to the insulation. Cables fordirect burial are so marked on the surface. Cables that have asunlight-resistant jacket are surface marked "sun res" or "sunlightresistant". Cables may include one or more optical-fiber member(s)and are surface marked to so indicate. Cables that are surface marked"oil resistant II" have a jacket that is for exposure to mineral oil attemperatures not in excess of 75?C (167?F). Cables that are surfacemarked "oil resistant I" have a jacket that is for exposure to mineral oilat temperatures not in excess of 60?C (140?F). Each insulatedconductor that is oil resistant II, oil resistant I, VW-1, gasoline-resistant,or has another individual conductor use is individually so marked.

1.3 The overall jacket on these cables is a "gas/vapor-tight continuoussheath" in the sense discussed in Sections 501.5(D) and 501.5(E) ofthe NEC (see 11.1.1). However, these requirements do not coverinvestigation of these cables for transmission of gases or vaporsthrough the core so, when these cables are used in a hazardouslocation, they may need to be sealed as described in the NEC.

1.4 These cables may contain one or more metal shields but do nothave a metal sheath or armor. Electrical cables with a metal sheath orarmor are covered as Type MC in the Standard for Metal-Clad Cables(UL 1569).

1.5 Connectors and other fittings for these cables are covered in theStandard for Fittings for Cable and Conduit (UL 514B).

1.6 These requirements do not cover the optical or other performanceof any optical-fiber member or group of such members.

Product Details

Edition: 4th Published: 11/14/2001