Can shielded cables be run in cable trays

Shielded tray cables are compatible with most cable trays, especially solid-bottom or enclosed trays, to minimize electromagnetic interference (EMI) and ensure reliable signal and power transmission.

Shielded Tray Cables

Shielded tray cables include a conductive layer, such as corrugated or flat copper tape, that protects against EMI from nearby electrical equipment, power lines, or industrial machinery . Corrugated shields offer flexibility and external EMI protection, while flat shields provide superior EMI protection both inside and outside the conductor core, making them ideal for sensitive applications like variable frequency drives (VFDs) or areas with high voltage fluctuations . These cables are typically rated for TC (Tray Cable) or TC-ER (Tray Cable, Exposed Run) standards, allowing installation in cable trays, ducts, conduits, or even direct burial .

Cable Tray Types and Shielding

The type of cable tray affects EMI protection:

• Solid-bottom trays: Provide strong shielding by blocking external EMI, suitable for shielded cables carrying sensitive signals .
• Enclosed trays (trough or channel): Offer the highest protection, fully surrounding the cables and preventing interference .
• Perforated trays: Offer limited EMI protection; shielded cables can still be used, but additional measures like metallic covers or EMI gaskets may be needed .
• Ladder or wire mesh trays: Provide minimal shielding; shielded cables are recommended, but external EMI may still affect performance unless additional shielding is applied .

Installation Considerations

• Grounding: Always bond metal trays to electrical ground to prevent the tray from acting as an antenna and amplifying EMI .
• Support: Shielded tray cables should be supported every six feet to prevent sagging and maintain mechanical integrity .
• Environment: Choose cables with appropriate insulation and jacketing (PVC, XLPE, CPE, or LSZH) for wet, dry, or hazardous industrial environments .
• Flexibility: Corrugated shields allow easier bending and routing in complex tray layouts, while flat shields are more rigid but provide better EMI protection .

Summary

For optimal performance in EMI-prone environments, use shielded tray cables in solid-bottom or enclosed cable trays, ensure proper grounding, and select the appropriate shield type based on flexibility and EMI protection needs. This combination ensures reliable power and signal transmission in industrial and commercial installations .