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Flat iron in cable tray

Flat iron in cable tray

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Flat iron in cable tray - MADIBA BAY OPTICS [PDF]

Flat iron in cable tray - MADIBA BAY OPTICS

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Flat iron can be used inside a cable tray primarily for structural support, cable separation, or grounding, provided NEC guidelines and tray load limits are followed.

Purpose of Flat Iron in Cable Trays

Flat iron, typically a steel bar or strip, is sometimes installed inside cable trays to:

  • Provide additional mechanical support for heavy cable bundles, especially in long horizontal runs or vertical risers where cables may sag.
  • Separate different cable types, such as power and control cables, to reduce electromagnetic interference (EMI) and maintain NEC-required separation.
  • Serve as a grounding or bonding path when metallic trays are used as equipment grounding conductors (EGC), ensuring electrical continuity and safety.

Installation Considerations

  • Tray Type Compatibility: Ladder trays, perforated trays, and solid-bottom trays can accommodate flat iron, but the method differs. Ladder trays allow easy attachment to rungs, while solid-bottom trays may require bolting or welding to the tray side rails. Perforated trays can use the holes for mounting flat iron supports.
  • Load and Fill Limits: NEC 392 specifies that power cables must not exceed 40% of the tray's cross-sectional area, and control cables 50% . Adding flat iron reduces usable space, so cable fill calculations must account for the flat iron's cross-section.
  • Clearances: Maintain at least 12 inches of vertical clearance above the tray for installation and maintenance access . Flat iron should not obstruct cable placement or violate this clearance.
  • Grounding: If the flat iron is metallic and in contact with a metallic tray, it can contribute to grounding continuity, but it must meet NEC bonding requirements .
  • Attachment Methods: Flat iron can be secured using bolts, clamps, or welding, depending on tray material and environmental conditions. Ensure that attachment does not compromise tray integrity or violate manufacturer specifications .

Best Practices

  • Use flat iron only where necessary for support or separation; avoid overloading the tray.
  • Ensure smooth edges to prevent cable jacket damage.
  • Verify compatibility with tray material (aluminum, steel, or FRP) to prevent galvanic corrosion.
  • Follow manufacturer guidelines for tray modifications and NEC compliance to maintain safety and inspection approval . In summary, flat iron can be effectively used inside cable trays for support, separation, or grounding, but careful attention must be paid to load limits, cable fill, clearances, and NEC compliance to ensure safe and code-compliant installation.

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