Galvanized flat iron connection for cable trays

Galvanized cable trays typically require flat iron (angle iron) or C-channel supports for proper installation and structural stability.

Support Requirements

Galvanized cable trays, whether perforated or solid, are usually mounted on MS (mild steel) support structures fabricated from angle iron (flat iron) or C-channels. These supports provide the necessary mechanical strength to hold the trays and cables, especially for long runs or elevated installations. For example, wall-mounted supports often use MS angles of 50 x 50 mm with 6 mm thickness, spaced at regular intervals, while bridge supports may use C-channels of 150 x 75 mm welded to the angle iron for additional stability.

Fastening and Connections

The trays are fastened to the support structure using high-tensile bolts, washers, and nuts, typically M8 galvanized or stainless steel hardware. Coupler plates are used to join two tray sections, ensuring alignment and load distribution. Welding may be applied where bridge supports are fabricated, and the welded areas are usually coated with primer and enamel paint to maintain corrosion protection.

Corrosion Protection

Since galvanized trays are prone to scratches or exposed steel at cut edges, flat iron supports should also be galvanized or painted to prevent galvanic corrosion. In outdoor or corrosive environments, hot-dip galvanization or compatible corrosion-inhibiting compounds are recommended at junctions between dissimilar metals.

Standards and Best Practices

Installation should comply with relevant standards such as BS EN 61537 for cable trays and BS 6946 for channel supports. Properly designed flat iron supports ensure that the trays can withstand imposed loads, including the weight of cables, wind, and other environmental factors, without deformation or failure.

Summary

In practice, flat iron (angle iron) or C-channel connections are essential for supporting galvanized cable trays, providing mechanical stability, proper alignment, and corrosion protection. Fastening with high-tensile bolts and ensuring compatible coatings at welded or joined areas are critical for long-term durability and compliance with installation standards.