Support spacing for cable trays must align with the manufacturer's instructions, as outlined in NEC 392. Generally, standard trays require supports every 6 to 10 feet, while heavy-duty, long-span trays can handle distances of up to 20 feet between supports. Many installation problems such as excessive tray deflection, vibration, connector failure, and uneven load distribution occur because support spacing was. Actual width of the cable tray. Common values: 50, 100, 150, 200mm Height of the beam to be crossed. multiconductor cable, support spacing, grounding/bonding as an equipment grounding conductor, and power/low-voltage separation. 8 (Other Mechanical Stresses (AJ)) in that document provides requirements for cable support.
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