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Can low-voltage 12V and 24V cables be run in cable trays

Fiber and communications infrastructure knowledge brief Published 03 Mar 2025

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Yes, 12V and 24V systems are considered low voltage, and cable trays rated for these voltages can be used for low-voltage wiring, provided NEC and separation requirements are followed.

Low-

Voltage Classification

Both 12V and 24V circuits fall under extra-low voltage (ELV) according to international standards and the NEC, which classifies voltages below 50V as low voltage for safety purposes. These systems are commonly used in LED lighting, control circuits, industrial automation, and telecommunications. While generally safe, proper wiring practices are still essential to prevent overheating, short circuits, or equipment damage.

Cable Tray Usage

According to NEC Article 392, cable trays can support service conductors, feeders, branch circuits, communications, control, and signaling circuits. For low-voltage circuits like 12V and 24V: Cables rated 600V or less can be installed together in the same tray without additional barriers, as long as tray fill and support requirements are met. Cables above 600V require separation or a solid barrier from lower-voltage cables, but this does not apply to typical 12V or 24V systems.

Tray types such as wire mesh (basket), ladder, or ventilated trough are suitable for low-voltage wiring, with wire mesh trays being popular for data and control cables due to flexibility and ventilation.

Separation and EMI Considerations

Even though 12V and 24V are low voltage, physical separation from higher-voltage circuits is recommended to reduce electromagnetic interference (EMI) and ensure compliance with NEC and TIA standards. Best practices include: Using divider brackets or compartmentalized trays if higher-voltage circuits are present. Ensuring shielded cables for sensitive analog or data signals when running near power cables.

Following NE

C 725. 136 and related articles for Class 2/3 circuits to avoid sharing space with Class 1 circuits unless properly installed.

Practical Tips

Verify that the cable insulation rating meets or exceeds the maximum voltage in the tray (12V and 24V cables typically have 300–600V insulation, which is sufficient). Maintain proper tray fill to prevent overheating and allow for future expansion. Secure cables at intervals according to manufacturer instructions to prevent sagging or mechanical damage.

Conclusion: 12V and 24V wiring can safely use cable trays designed for low-voltage circuits, provided NEC compliance, proper separation, and installation practices are followed. This ensures both safety and reliable operation of low-voltage systems.

Can low-voltage 12V and 24V cables be run in cable trays - CJC FIBRE CONSULTANTS [PDF]

Can low-voltage 12V and 24V cables be run 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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