Galvanized Angle Iron for Cable Trays

Cable trays can be effectively supported using galvanized angle iron by creating a secure framework with proper spacing, fastening, and corrosion protection.

Selecting and Preparing Galvanized Angle Iron

Use galvanized steel angle iron to resist corrosion and provide sufficient mechanical strength for the cable load. The size and thickness of the angle iron should be chosen based on the span of the cable tray and the total weight of cables, including any future expansion. Commonly, 1.6 mm to 3 mm thick angles are used for medium-duty installations .

Mounting Methods

1. Wall or Ceiling Brackets: Attach the angle iron to walls or ceilings using high-tensile bolts, washers, and nuts. Ensure the mounting surface can support the combined weight of the tray and cables .
2. Suspended Supports: For overhead runs, suspend the angle iron from threaded rods or hangers. The rods should be spaced according to the tray manufacturer's recommended span, typically 1.5–3 meters for ladder or solid-bottom trays .
3. Direct Fastening: Angle iron can be bolted directly to structural steel or concrete using appropriate anchors. Ensure the bolts are galvanized or stainless steel to prevent galvanic corrosion .

Attaching Cable Trays

• Place the cable tray on the horizontal flange of the angle iron and secure it using U-bolts, clamps, or tray-specific mounting brackets .
• Ensure the tray is level and aligned along the run to prevent cable stress.
• For long runs, use intermediate supports to prevent sagging and maintain the tray's load rating.

Load and Safety Considerations

• Verify the load class of the cable tray and ensure the angle iron support spacing does not exceed the manufacturer's recommendations .
• Consider dynamic loads, such as vibrations or short-circuit forces, when designing the support system .
• Maintain electrical continuity if required for grounding purposes, using bonding straps or grounding lugs between the tray and angle iron .

Corrosion Protection

• Galvanized angle iron provides basic corrosion resistance, but in high-humidity or chemical environments, additional coatings or stainless steel may be necessary .
• Avoid direct contact between dissimilar metals to prevent galvanic corrosion. By following these guidelines, galvanized angle iron can provide a robust, safe, and durable support system for cable trays in industrial and commercial installations.