Terminology for Cable Tray Connection Cables

Cable tray connection cables are commonly referred to as TC, TC-ER, ITC, PLTC, and MC cables, each designed for specific power, control, or instrumentation applications in cable tray systems.Key Cable Types1. TC (Tray Cable) Tray Cable (TC) is a multi-conductor cable designed for power, lighting, and control circuits in industrial and commercial environments. It is rated for 600 volts and can be installed in cable trays, raceways, or direct burial if specifically rated. TC cables are UL listed and suitable for Class 1, Division 2 hazardous locations. They must be continuously supported and secured at intervals not exceeding six feet when transitioning between trays and equipment . 2. TC-ER (Tray Cable with Exposed Run Rating) TC-ER cables are an enhanced version of TC cables, designed for short exposed runs (up to 6 feet) between the tray and equipment. They feature impact- and crush-resistant jacketing to meet additional UL standards, allowing installation without conduit in certain conditions . 3. ITC (Instrumentation Tray Cable) Instrumentation Tray Cable (ITC) is intended for low-energy control, signal, and communication circuits, typically not exceeding 150 volts and 5 amps. ITC cables are available in shielded or unshielded constructions and are used for PLCs, DCS systems, transmitters, and other instrumentation. ITC-ER variants allow short exposed runs similar to TC-ER . 4. PLTC (Power Limited Tray Cable) PLTC is used for Class 2 and Class 3 power-limited circuits, such as alarm systems, intercoms, security, and building automation. PLTC cables provide similar protections as TC but are designed for lower voltage and limited power applications . 5. MC (Metal-Clad) Cables While not strictly tray cables, MC cables are assemblies of insulated conductors with metal armor, suitable for power, lighting, and control circuits. They can be installed in cable trays, raceways, or direct burial (where identified) and must be supported at intervals not exceeding six feet .Standards and MarkingsNEC (National Electrical Code): Articles 336 and 725 define installation rules, permitted locations, and limitations for TC, ITC, and PLTC cables .UL (Underwriters Laboratories): UL 1277 specifies construction, insulation, flame resistance, crush resistance, and exposure to chemicals and sunlight. Cables are marked with designations like “UL TC-ER” or “UL ITC-ER” for compliance verification .Installation NotesCables must be continuously supported in trays and secured at regular intervals.Exposed runs are limited to short distances (typically 6 feet) unless using ER-rated cables.Selection of cable type depends on voltage, current, environmental exposure, and whether the circuit is power, control, or instrumentation . Understanding these terms ensures proper selection, compliance with safety standards, and reliable performance in industrial and commercial cable tray installations.