Cable tray hangers should generally be spaced 1.5 to 3 meters apart for horizontal runs, with closer spacing for heavy cables or bends to ensure stability and prevent sagging.

Horizontal Runs

For standard horizontal cable tray installations, the support span between hangers typically ranges from 1.5 meters to 3 meters depending on the tray type and cable load . Heavier power cables require shorter spans, often around 1 to 1.5 meters, while lighter data or telephone cables can be supported at up to 3 meters . The NEC specifies that supports should not exceed 5 feet (approximately 1.5 meters) for ladder-type trays to maintain structural integrity .

Vertical Runs

For vertical cable tray runs, hangers should be installed at intervals preferably less than 2 meters, with cables secured at the top and every 1.5 meters to prevent undue mechanical strain .

Bends, Corners, and Junctions

At corners, T-junctions, or bends, it is recommended to place one hanger on each side, arranged symmetrically, to evenly distribute the load and prevent sagging . Fixed supports should also be used at the beginning and end of tray runs and for spans longer than 30 meters.

Hanger Type and Diameter

When using hanging rod supports, the rod diameter should be no less than 8 millimeters to provide adequate strength . For wall-mounted or cantilever supports, ensure the bolts and brackets are strong enough to handle the tray and cable weight without pulling out of the structure .

Practical Recommendations

• Heavy power cables: closer spacing (1–1.5 meters)
• Lightweight data cables: wider spacing (up to 3 meters)
• Industrial or high-load environments: follow the 1.5-meter rule to allow for future cable additions
• Material compatibility: use the same metal finish for hangers and trays to prevent galvanic corrosion By following these guidelines, cable trays remain stable, safe, and compliant with electrical codes, while also allowing for future maintenance and cable additions.