Yes, cable trays can support mineral-insulated (MI) cables, but the type of tray and cover should be chosen to provide adequate mechanical protection and compliance with installation standards.

Cable Tray Considerations for MI Cables

MI cables are highly durable, fire-resistant, and compact, often used in industrial and hazardous environments. Their solid construction allows them to be installed in cable trays without additional conduit, but proper support and protection are still required . Tray Types and Covers:

• Solid-bottom trays provide maximum protection against falling debris, liquids, and physical damage, making them ideal for MI cables in industrial or outdoor environments .
• Ventilated trays allow air circulation and some debris to fall through, which is suitable for MI cables where heat dissipation is needed but moderate protection is sufficient .
• Ladder trays support cables on rungs and may require additional covers if protection from dust or impact is necessary . Covers:
• Covers are recommended for outdoor installations or areas with dust, water, or potential mechanical impact. Solid or peaked covers can prevent debris accumulation and protect the MI cables from environmental hazards .

Installation Guidelines

• MI cables should be supported at regular intervals according to manufacturer specifications to prevent sagging or mechanical stress .
• Ensure fill capacity of the tray is not exceeded to avoid overheating and maintain proper ampacity .
• Use compatible fittings and accessories to maintain support at changes in elevation or direction .
• Installation should comply with NEC Article 392 and local electrical codes, ensuring that MI cables are properly secured and protected within the tray system .

Summary

Cable trays are suitable for MI cables, but the choice of tray type and cover depends on the level of mechanical protection, environmental exposure, and heat dissipation requirements. Solid-bottom trays with covers offer the highest protection, while ventilated or ladder trays may be used where airflow and moderate protection are sufficient. Proper support, spacing, and adherence to code requirements are essential for safe and reliable installation .