Natural Suitability of Ladder-Type Cable Trays
Ladder-type cable trays resemble a "cable staircase" with a robust, steel-like framework; their rung spacing and open structure make them inherently suitable for high-voltage/high-power applications:
Heat dissipation advantages: When cables generate significant heat, airflow can reduce the temperature rise by 15–20%.
High load-bearing capacity: A single layer of rungs can support a uniformly distributed load of 30 kg/m; stacking multiple layers doubles this capacity.
Ease of maintenance: The open design makes inspecting and repairing lines as simple as "flipping through the pages of a book."
Three Classic Scenarios for High-Power Applications
Main lines in power distribution rooms: Supports large-cross-section cables (35 mm² or larger); rung spacing is typically set at 150–200 mm.
Overhead routing in factories: When paired with anti-sway supports, it enables stable installation of power lines with spans of up to 10 meters.
Substation corridors: When multiple tray layers are installed side-by-side, a separation of at least 300 mm is maintained between high-power and low-voltage/signal cables.
Guide to Avoiding Selection Pitfalls
These details determine the performance of ladder-type cable trays in high-power applications:
Galvanized coating thickness: Must be at least 65 μm to ensure 20-year corrosion resistance.
Rung chamfering: Trays with rounded rung edges prevent damage to cable insulation.
Connector conductivity: The cross-sectional area of copper bonding jumpers should be at least 4 mm².
Installation inclination: The slope for high-power lines should be kept within 5° to prevent cable slippage.
