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What does CT stand for in fireproof cable trays
In fireproof cable trays, "CT" stands for "Cable Tray" rating, indicating that the cable is tested and approved for use in cable tray installations under fire conditions.
Explanation
CT-rated cables are specifically designed for installation in cable trays and are tested to withstand fire exposure while maintaining circuit integrity. The "CT" designation ensures that the cable meets the UL 1685 vertical-tray flame test and other relevant standards for fire resistance in industrial environments . These cables are typically used in sizes 1/0 AWG and larger and are suitable for power and control circuits in industrial settings .
Key Features of CT-Rated Cables
- Fire Resistance: CT cables are tested to resist flame propagation along the tray, ensuring safety during fire incidents .
- Industrial Use: They are intended for continuous use in cable trays in industrial environments, complying with NEC Article 392 .
- Construction: Often thermoset-insulated (like XHHW) or thermoplastic, with PVC jackets, suitable for wet or dry locations .
- Voltage Rating: Typically rated for 600 volts, suitable for power and control applications .
Applications
CT-rated cables are used in:
- Cable trays in industrial plants for power distribution and control circuits.
- Fireproof installations where maintaining circuit integrity during a fire is critical.
- Vertical and horizontal tray runs, ensuring compliance with fire safety codes . In summary, "CT" indicates that a cable is certified for safe use in cable trays, particularly under fire conditions, providing both mechanical and fire protection compliance .
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