In the context of cable trays, "CT" stands for "Cable Tray" and can also refer to cables rated for use in cable tray installations.

CT as Cable Tray

The abbreviation CT is commonly used to denote Cable Tray, which is a system designed to support insulated electrical cables used for power distribution, control, and communication. CT cable trays are often perforated-bottom trays, allowing airflow around the cables to prevent overheating. They are typically made from materials such as sheet steel, stainless steel, aluminium, or pre-galvanised steel, and come in various widths and lengths to accommodate different cable loads and installation requirements . CT trays can be fitted with bends, risers, and covers to suit industrial or commercial applications .

CT in Cable Ratings

In addition to representing the tray itself, CT can also indicate a cable rating. Certain cables, such as XHHW/PVC conductors, are marked as CT-rated, meaning they are tested and approved for use in cable tray installations under standards like UL 44 and UL 1685. These ratings ensure the cables can withstand conditions such as vertical tray flame exposure and are suitable for industrial environments, wet or dry locations, and temperatures up to 90°C .

Summary

• CT = Cable Tray: Refers to the physical tray system used to support and organize cables.
• CT-rated cables: Cables marked for safe use within cable trays, meeting specific flame and industrial standards.
• CT trays are often perforated for ventilation and can be made from various metals with multiple fittings available for complex installations . Understanding the dual use of "CT" helps ensure proper selection of both the tray system and compatible cables for safe and efficient electrical installations.