Fiber optic cables are placed in the cable tray
Fiber optic cables can be installed in cable trays if they meet the appropriate NEC listings and mechanical requirements for the environment.
Regulatory Guidelines
According to the 2023 National Electric Code (NEC), fiber optic cables are permitted in cable trays under Article 770, Section 770-113(h). The NEC allows various types of optical fiber cables, including OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC, to be supported in cable trays, provided any additional restrictions, such as plenum or riser ratings, are observed for specific environments like plenum spaces . Cable trays differ from raceways in that they are open, allowing easier access and installation, but require cables to withstand mechanical and environmental stresses.
Cable Types and Mechanical Considerations
Fiber optic tray cables (FOTC) are specifically designed for tray installations. These cables are tight-buffered and engineered to resist pulling forces, impact, crush, and bending stresses during installation and operation . For example, OCC's B-series tray cables are tested to withstand crush forces up to 2200 N/cm and extreme temperatures ranging from -50°C to +85°C, depending on jacket type, ensuring durability in both indoor and outdoor environments . Jackets often include UV-stabilizing compounds to prevent degradation from sunlight exposure.
Installation Best Practices
When placing fiber optic cables in trays, it is important to:
- Maintain the minimum bend radius to prevent fiber damage.
- Avoid excessive pulling tension; residual tension should remain below the cable's long-term load rating .
- Separate conductive fiber optic cables (OFC) from power conductors, while non-conductive cables (OFN) may share trays with low-voltage circuits .
- Use proper clamping intervals for vertical runs to prevent cable sag and movement .
- Plan the route to avoid physical hazards such as high temperatures, machinery, or sharp edges .
Summary
Fiber optic cables can safely be installed in cable trays if they are listed for tray use, meet mechanical and environmental durability standards, and are installed according to NEC guidelines and best practices. Proper selection of cable type, jacket material, and installation technique ensures long-term reliability and compliance with safety standards .
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