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Should cables in cable trays be bound with wire

Fiber and communications infrastructure knowledge brief Published 16 Jan 2024

Prepared for preliminary research by the ALFA PRO knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Using bare wire to bind cables in cable trays is generally not recommended; approved methods like nylon ties, Velcro straps, or binder threads are preferred for safety, code compliance, and cable protection.

Safety and Code Considerations

Cable trays are designed to support and organize cables while allowing heat dissipation and easy access for maintenance. Using bare wire to bind cables can create sharp edges or pinch points, potentially damaging cable insulation and increasing the risk of electrical faults or short circuits. Additionally, bare wire may not comply with NEC Article 392, which governs cable tray installation and requires securement methods that do not compromise cable integrity.

Recommended Binding Methods

Nylon or plastic cable ties: These are widely used for bundling cables in trays. They provide secure support without damaging insulation and allow some flexibility for thermal expansion. Velcro straps: Ideal for areas where cables may need to be frequently added or removed, as they are reusable and reduce stress on the cables.

Waxed nylon string or harnesses: Common in long cable runs, especially for high-voltage or low-voltage applications, as they minimize snagging and allow heat dissipation.

Special Considerations

Wire mesh trays: If using wire mesh cable trays, a separate grounding conductor may be recommended, but the tray itself should not be used as a binding method. Heat dissipation: Over-tightening bindings can restrict airflow around cables, leading to overheating. Proper spacing and minimal tension are important.

Mechanical stability: Bindings should prevent sagging and maintain cable organization without stressing connectors or insulation.

Conclusion

While wire can technically hold cables in place, it is not considered a best practice due to potential insulation damage, safety risks, and code compliance issues. Using approved cable ties, Velcro straps, or binder threads ensures secure, safe, and maintainable cable installations in cable trays.

Should cables in cable trays be bound with wire - ALFA PRO COMMUNICATION SYSTEMS (Pty) Ltd [PDF]

Should cables in cable trays be bound with wire

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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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