A cable tray system, according to the US National Electrical Code, is "a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways." Cable trays are used to hold up and distribute cables.
Cable trays are widely used as temporary usage of electric power in building site, industry and mining enterprise, decoration and mending where adopt the electric power of 220V and 380V.
With features of light weight, low cost, special shape, easy for installation, good ventilation etc, ladder type cable tray suit for laying of large diameter cable, especially suitable for high/low voltage power cable laying.