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Are cable trays in corridors considered part of a low-voltage system

Fiber optic splice closure knowledge brief Published 18 Aug 2022

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Cable trays in corridors are not inherently part of a low-voltage system; they are a support pathway that can carry low-voltage cables.Role of Cable Trays

Cable trays are structural components used to support, route, and protect cables across open spans, similar to how bridges support traffic . They are not raceways themselves but provide a pathway for various types of cables, including power, control, data, and telecommunications wiring . Cable trays can be installed in corridors, ceilings, or other accessible areas to organize and manage cable systems efficiently.

Relationship to Low-Voltage Systems

Low-voltage systems, such as Class 2 and Class 3 circuits, include security, access control, fire alarm, and communication systems . While the cables within the tray may be part of a low-voltage system, the tray itself is considered a support and management structure, not an active component of the system . NEC Article 392 allows cable trays to carry service conductors, feeders, branch circuits, communications circuits, control circuits, and signaling circuits, provided installation and fill requirements are met . This means low-voltage cables can safely share a tray with other cables if proper separation and support are maintained.

Key Considerations
  • Separation and Fill: Low-voltage cables must comply with NEC fill and support requirements when installed in trays .
  • Voltage Rating: Cables rated 600 volts or less can be installed together in the same tray without additional separation, while higher-voltage cables require barriers .
  • Flexibility: Cable trays allow easy marking, removal, and reconfiguration of low-voltage cables, making them ideal for upgrades or relocations .
Conclusion

In summary, cable trays themselves are not part of a low-voltage system, but they serve as a permissible pathway for low-voltage cables in corridors and other areas. Proper installation according to NEC and OSHA guidelines ensures that low-voltage systems are safely supported and organized within these trays .

Are cable trays in corridors considered part of a low-voltage system - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Are cable trays in corridors considered part of a low-voltage system

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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