Horizontal elbows should be supported at points that prevent sagging and maintain the tray's alignment. Supports are typically placed near the elbow ends and at intervals along the run, ensuring that connectors between straight sections do not fall at the center of spans or directly on supports . The support system should allow for longitudinal movement to accommodate thermal expansion, especially in long runs or outdoor installations . Maximum support spacing depends on the tray type and load, but standard ladder trays often require supports every 3.6 meters (12 feet) or as specified by the manufacturer .
When installing horizontal elbows, ensure that the tray sections are properly aligned to avoid sharp bends that could damage cables or exceed the minimum bend radius . The elbow should smoothly transition the cable path without twisting or compressing the cables. Use appropriate clamps or hangers to secure the elbow, maintaining the same height and orientation as the adjoining straight sections . For double ladder trays, special double clamps may be used to support adjacent trays simultaneously .
All cable tray elbows must be bonded to the tray system to maintain electrical continuity and safety. Bonding jumpers should be installed at expansion joints and at intervals of approximately 15 meters (50 feet) along the tray . Conduit drop-outs connected to elbows should also be bonded using compression lugs or grounding bushings .
Installation should comply with NEMA VE 2, NEC, and manufacturer instructions . Only qualified personnel familiar with electrical installation practices should perform the work, ensuring that the tray system supports the intended cable load and meets safety requirements . Avoid using the tray as a walkway or support for personnel, as this can compromise both safety and structural integrity .
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