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What does CL stand for in cable trays

CL stands for "Class" in cable ratings, indicating the cable's suitability for specific low-voltage or power-limited applications according to the National Electric Code. In cable trays, CL is used to denote the class of the cable, such as CL2 or CL3, which are defined in Article 725 of the NEC. CL2 cables are designed for Class 2 remote-control, signaling, and power-limited circuits, suitable for low-voltage applications like burglar alarms, intercoms, and speaker wiring, with a voltage rating up to 150 volts.

CL3 cables are for Class 3 circuits, supporting higher voltage spikes up to 300 volts, often used in similar low-voltage applications but with greater electrical tolerance. Variations and RatingsCL2R / CL3R: Riser-rated cables, suitable for vertical runs between floors in a building. CL2P / CL3P: Plenum-rated cables, designed for use in air-handling spaces where fire and smoke resistance is critical.

Purpose: These ratings ensure that cables installed in walls, ceilings, or cable trays meet fire safety and voltage protection standards, preventing hazards like fire propagation or electrical surges.

Practical Implications

When selecting cables for a tray system, the CL rating informs electricians and designers about the cable's fire resistance, voltage capacity, and appropriate installation environment. Using the correct CL-rated cable ensures compliance with building codes and enhances safety in commercial and residential installations.

What does CL stand for in cable trays

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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