How to get out of the cable tray cable trench

Cables can exit a cable tray into a trench using dropouts, exit clips, or conduit adapters while maintaining proper bend radius and code compliance.

Common Methods for Cable Exit

Dropouts Dropouts are pre-manufactured openings in the bottom or side of a cable tray that allow cables to exit smoothly into a trench or conduit. They help maintain the correct bend radius and reduce stress on the cables, preventing pinching or fatigue. Exit Clips or Waterfalls Exit clips, such as the SmartRack® cable exit clip, attach to the tray and guide cables downwards.

They prevent sharp bends and allow multiple cables to exit in a controlled manner. Clips can be snapped together to accommodate wider cable bundles. Conduit Adapters Cables can transition from the tray into a conduit system using conduit adapters.

This method protects cables from physical damage and ensures a smooth path into the trench or equipment. The conduit should be properly bushed to prevent abrasion. Exit Plates or Flanged Openings Some installations use exit plates or flanged openings at the tray end.

These provide a controlled exit point and can be sealed with duct seal to prevent debris from entering the trench or equipment.

Best Practices

Maintain Bend Radius: Ensure cables are not bent beyond their minimum bend radius when exiting the tray to prevent damage and signal degradation. Support and Secure Cables: Use cable ties, straps, or approved supports to keep cables organized and prevent sagging or tangling. Segregate Cable Types: Separate power, control, and communication cables to reduce electromagnetic interference (EMI) if required.

Code Compliance: Follow NEC 392. 46 and local electrical codes for transitioning cables from trays to raceways or trenches, including sealing openings to prevent debris ingress. Avoid Open Edge Exits: Do not allow cables to exit over an unprotected edge, as this can create hazards and violate code requirements.

By using dropouts, exit clips, or conduit adapters, and following proper support and bend radius practices, cables can safely transition from a cable tray into a trench while maintaining compliance and minimizing mechanical stress.