ConstructionStranded coated copper. The insulation shall be either fire retardent ethylene propylene rubber (FREP) or fire retardant cross-linked Polyethylene (FRXLPe). Method 1 - Table K1 color coded, conductors cabled with fillers as necessary, helically applied copper tape shield, CSPE jacket overall, surface printed.Standards1) Type TC Tray Cable per Article 340 of the NEC.2) Individual conductors approved as Type XHHW.3) Individual conductors pass UL 44 and the VW-1 vertical flame test.4) Overall jacket approved as Sunlight Resistant.5) Cables pass IEEE-383 ribbon burner flame test.