What types of cables are typically routed through cable trays

Cable trays commonly carry power, control, and instrumentation cables, including TC, TC-ER, ITC, and medium-voltage cables, all designed to meet NEC and UL standards.Power and Control CablesTray Cable (TC) is the most frequently used type for power and control circuits. It consists of two or more insulated conductors under a non-metallic jacket and is rated for 600 volts. TC cables are suitable for industrial power, lighting, and control circuits, and can be installed in cable trays, raceways, or outdoor locations when supported by a messenger wire. They are UL listed and may be used in hazardous locations if specified . TC-ER (Tray Cable with Exposed Run Rating) is a variant designed for short exposed runs of up to six feet between the tray and equipment. It features crush- and impact-resistant jacketing, allowing it to transition outside the tray without conduit in certain conditions . Medium-voltage cables (Type MV) and single-conductor cables of size 1/0 or larger are also permitted in industrial settings, provided they are installed by qualified personnel and meet NEC restrictions .Instrumentation and Signal CablesInstrumentation Tray Cable (ITC) is used for low-energy control, signal, and communication circuits, typically not exceeding 150 volts and 5 amps. ITC cables can be shielded or unshielded, with multiple conductors or twisted pairs, and may include metal armor for additional protection. They are commonly used for PLCs, DCS systems, transmitters, and other instrumentation applications . Some ITC cables also have an ER rating, allowing short exposed runs similar to TC-ER cables.Installation ConsiderationsAll cables routed in trays must be UL listed and marked as cable tray rated, and installations must comply with NEC Article 392. This includes considerations for tray fill, ampacity derating, cable separation, and securing cables at proper intervals. Ladder trays, ventilated troughs, and solid-bottom trays are selected based on cable type, ventilation needs, and environmental protection requirements . In summary, cable trays are designed to carry a variety of cables, primarily TC, TC-ER, ITC, and medium-voltage cables, providing organized, safe, and code-compliant routing for power, control, and instrumentation systems in industrial, commercial, and utility environments .