Armored cable entering the cable tray

Armored cables entering a cable tray must be installed with proper mechanical protection, bend radius, and compliance with standards to ensure safety and long-term reliability.

Key Considerations for Armored Cable Entry

Mechanical Protection: Armored cables are designed to resist impact, moisture, and environmental stress, but additional protection is required at entry points to cable trays. Use cable glands, bushings, or entry fittings to prevent abrasion against tray edges and maintain the integrity of the armor and insulation. Bend Radius: Maintain the cable's minimum bend radius when entering the tray to avoid damage to the armor or conductors.

Over-bending can compromise insulation and reduce cable lifespan. Routing and Separation: Plan clear, direct routes into the tray to minimize unnecessary bends and mechanical strain. Separate high-power and low-power cables to prevent electromagnetic interference (EMI) and ensure proper ventilation within the tray.

Tray Fill and Support: Do not exceed the tray's fill capacity—typically 40% for power cables and 50% for control cables. Support armored cables at regular intervals to prevent sagging and mechanical stress. Standards Compliance: Follow applicable standards such as IEC 60079-14 for hazardous locations or NEC Article 392 for cable tray installations.

Metallic trays can serve as grounding conductors if properly bonded, and armored cables may be required in certain environments for added safety. Environmental Considerations: Inspect the installation site for exposure to water, chemicals, or temperature extremes. Use moisture-resistant or halogen-free XLPE armored cables in corrosive or high-temperature environments.

Termination and Accessibility: Ensure that armored cables are properly terminated with glands or connectors at the tray entry. Maintain sufficient vertical clearance above the tray for installation and maintenance access. By following these practices, armored cables entering a cable tray will maintain mechanical integrity, comply with safety standards, and provide reliable long-term performance in industrial, commercial, or outdoor installations.