Before installation, review the approved shop drawings to determine tray layout, lengths, and locations within electrical rooms, plant rooms, or service corridors. Inspect all materials upon delivery to ensure they match approved submittals and are free from damage. Store trays horizontally on a flat surface with timber supports at intervals of about one meter, protecting them from moisture and sunlight . Verify that all tools and equipment comply with contract and safety requirements .
Choose a tray type suitable for the application, such as ladder, ventilated trough, or solid-bottom trays, based on cable types, environmental conditions, and load requirements. Materials may include aluminum, steel, or FRP, selected according to environmental exposure and mechanical load . Ensure trays conform to NEMA VE 1 standards for structural integrity and load-bearing capacity .
Common support methods include:
Perform cable fill calculations according to NEC 392.22 to prevent overfilling, which can cause overheating. Identify cable types and their cross-sectional areas, sum the areas, and compare with the maximum permissible fill for the tray width . Maintain proper separation between high-power and low-power cables to prevent electromagnetic interference . Ensure at least 12 inches of vertical clearance above trays for installation and maintenance access .
After installation, inspect the tray system for:
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