Cable Tray Requirements for Single-Conductors

[MDK]

392.3.B.1.a states "Single-conductor cable shall be 1/0 AWG or larger and shall be of a type listed and marked on the surface for use in cable trays." What does "type listed and marked on the surface for use in cable trays" really mean? What is an example marking? I have been told TC for example, but 336.2 DEFINITION for Power and Control Tray Cable, Type TC, states "A factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a nonmetallic jacket." this doesn't appear to be applicable for a single-conductor. These questions not only apply to new installations, but also upgrades to existing installations.

Thanks,

MDK

 

[rbalex]

The UL Online Information Guide for Thermoset Insulated Wire states:

http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?&name=ZKST.GuideInfo&ccnshorttitle=Thermoset-insulated+Wire&objid=1074133871&cfgid=1073741824&version=versionless&parent_id=1073996419&sequence=1

Wire and cable marked "Cable Tray Use" complies with a Vertical-Tray Flame Test. Wire and cable marked "Sunlight Resistant" complies with an artificial weathering test. The "Cable Tray Use" marking, with or without the "Sunlight Resistant" marking, pertains to single conductor sizes 4 through 1 AWG for grounding conductors only, single conductor sizes 1/0 AWG and larger, and all sizes of multiconductor Types RHH, RHW, RHW-2, XHH, XHHW and XHHW-2. Wire Types RHW, RHW-2, XHHW and XHHW-2 intended to be installed on a messenger may be marked "Sunlight Resistant" in all sizes.

[rbalex ? underline added]