Specifications for long-span cable trays in South Africa

Long-span cable trays in South Africa are typically made from pre-galvanised, hot-dip galvanised, or stainless steel, designed to support heavy cable loads over extended spans while complying with SANS and NEMA standards.

Materials and Finishes

Long-span cable trays are manufactured from mild steel, pre-galvanised steel (Z275), hot-dip galvanised steel, or stainless steel (304/316 grades), depending on environmental conditions and corrosion resistance requirements . Pre-galvanised steel is suitable for light-duty applications, while hot-dip galvanised and stainless steel are preferred for medium to heavy-duty or corrosive environments . Stainless steel options, including 3CR12, SS304, and SS316, are ideal for industrial, mining, and coastal installations .

Types of Cable Trays

• Ladder Type: Provides maximum support for heavy cables and allows airflow to prevent overheating. Suitable for power and control cables in industrial and commercial applications .
• Perforated Cable Tray: Features punched holes or slots for ventilation, balancing cable protection and airflow, ideal for moderate heat-generating cables .
• Wire Mesh Tray: Lightweight and flexible, suitable for IT, fiber optic, and network cables, allowing easy routing and cooling .
• Solid Bottom Tray: Continuous base and sides for maximum protection, used where cables require full shielding from environmental factors .

Dimensions and Load Capacity

Long-span trays are designed for horizontal or vertical mounting, with support intervals typically ranging from 1.0 m to 3.0 m, depending on the tray type and load . For example, the F76 cable ladder supports spans of 1.5, 2.0, or 3.0 m with a safe working load of 112 kg/m and a safety factor of 1.5, with deflection limits of 10–15 mm for end spans . The MT38 tray system supports widths up to 609 mm and is suitable for medium to heavy-duty applications .

Standards and Compliance

Cable trays in South Africa comply with SANS 3575:2008 / ISO 3575:2005 for pre-galvanised steel and NEMA VE1-2009 for load and deflection testing . Hot-dip galvanised trays follow ISO 1461:1999 for corrosion protection . These standards ensure structural integrity, safety, and durability for industrial and commercial installations.

Accessories and Installation

Long-span cable trays require support near each end and at the center, with accessories such as bolts, nuts, bends, and junctions designed to maintain structural continuity . Overlaps and bolted connections are commonly used, eliminating the need for splices in many systems . Installation must follow manufacturer guidelines to ensure compliance with load ratings and deflection limits.

Applications

Long-span cable trays are widely used in:

• Industrial plants and factories for power and control cables
• Data centers and IT facilities for fiber optic and network cabling
• Renewable energy plants for solar and wind power cable routing
• Commercial buildings and infrastructure projects requiring organized, safe, and durable cable management These trays provide efficient cable management, enhanced safety, and long-term durability, making them essential for modern electrical infrastructure in South Africa.