Site Preparation and Material Handling: Before installation, inspect all cable trays, ladders, and accessories for damage and verify compliance with approved material submittals. Store trays horizontally on flat surfaces with timber supports at one-meter intervals, protecting them from moisture and direct sunlight . Review approved shop drawings to confirm layout, lengths, and locations of trays and ladders within the building . Tray Types and Materials: Choose cable tray materials based on environmental conditions. Common options include aluminum, steel, stainless steel (AISI 316L), and fiberglass-reinforced plastic (FRP). Aluminum offers corrosion resistance due to its natural oxide layer, while stainless steel provides superior resistance in highly corrosive environments, such as coastal areas in Palau . Ventilated, solid, or wire-mesh trays can be selected depending on heat dissipation and electromagnetic interference (EMI) requirements . Clearances and Fill Limits: Maintain at least 12 inches of vertical clearance above trays for installation and maintenance access. Power cables should not exceed 40% of the tray's cross-sectional area, and control cables should not exceed 50%. Separate high-power and low-power cables to prevent EMI .
Metallic Cable Trays as Equipment Grounding Conductors (EGC): Metallic trays can serve as the EGC if installed in facilities where qualified personnel will maintain the system. All metallic trays must be grounded according to NEC Article 250.96, regardless of whether they are used as the EGC . Bonding Methods: If an EGC cable is installed in or on the tray, bond it to each or alternate tray sections using grounding clamps. This ensures mechanical stability under fault conditions and maintains electrical continuity . Avoid placing bare copper conductors in aluminum trays in moist environments to prevent electrolytic corrosion; use insulated conductors with insulation removed only at bonding points with tin or zinc-plated connectors . Cross-Section Considerations: The effective grounding path should be permanent, electrically continuous, and capable of safely conducting fault currents. The cross-sectional area of the tray's side rails (and bottom if solid) determines its suitability as an EGC .
This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems,
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Home / Resources / Technical Guide / A Technical Guide to Tray Cable A Technical Guide to Tray Cable Across industry tray cable
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