Cable tray elbows, which allow the tray to change direction horizontally or vertically, require dedicated support points to prevent sagging and maintain structural integrity. Supports should be positioned near the elbow and at intervals along the tray span, ensuring that connectors do not fall at the center of unsupported spans. Typically, the support for an elbow is placed between the support point and the quarter-point of the span to distribute weight evenly and reduce stress on the tray system .
Elbows should be fastened securely to the support system using brackets or guides that allow for longitudinal movement, accommodating thermal expansion and contraction. For outdoor or long runs, expansion connectors should be installed at intervals of 30 meters (100 feet) or as specified by NEMA VE 2. This prevents structural stress and maintains alignment of the cable tray system .
All cable tray elbows must be bonded to the main tray system to maintain electrical continuity. A bonding jumper should be installed at each expansion joint, and the tray should be grounded at least every 15 meters (50 feet) and at both ends. Conduit drop-outs connected to elbows should also be bonded using a compression lug or grounding bushing to ensure safety .
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