ARTICLE 336. POWER AND CONTROL TRAY CABLE: TYPE TCARTICLE 336. POWER AND CONTROL TRAY CABLE: TYPE TC336.2. Definition. This article covers the use of a nonmetallic-sheathed power and control cable, designated Type TC cable (TC is the abbreviation for tray cable) (Fig. 336-1). The cable is an assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a nonmetallic jacket. Type TC cable must be listed (336.6). It is a cable that can be used for power and lighting applications, as well as control and signaling functions, including Class 1 control circuits as well as non-power-limited fire alarm wiring.