Cable Tray Hanger Installation Materials

Cable tray hangers require materials and hardware selected for load capacity, environmental conditions, and corrosion resistance, including steel, stainless steel, aluminum, fiberglass, threaded rods, anchor bolts, and appropriate fasteners.

Common Hanger Materials

Steel: Hot-dip galvanized (HDG) or electro-galvanized steel is widely used for industrial and outdoor installations due to its strength and corrosion resistance. Pre-galvanized steel is suitable for indoor dry environments, while HDG provides superior protection in wet or coastal areas. Stainless Steel: Typically AISI 316L, stainless steel is ideal for chemical plants, food processing, or highly corrosive environments.

Its chromium and molybdenum content ensures excellent corrosion resistance and mechanical strength. Aluminum: Lightweight and naturally corrosion-resistant, aluminum alloys (5000 and 6000 series) are used where weight reduction and ease of handling are important. Aluminum can also be painted for aesthetic or protective purposes.

Fiberglass (FRP): Non-metallic, non-conductive, and corrosion-resistant, fiberglass trays are suitable for highly corrosive or non-magnetic environments. They provide a high strength-to-weight ratio and are fire-resistant.

Hardware and Fasteners

Threaded Rods: Used for ceiling suspension (trapeze hangers), rods must be pre-cut and threaded to support the tray load. Nuts and washers are pre-threaded to simplify installation. Anchor Bolts: Expansion bolts or drop-in anchors secure wall-mounted brackets or ceiling supports to concrete or structural members.

Brackets and Struts: Cantilever wall brackets, Unistrut channels, or trapeze cross members provide horizontal support. The choice depends on ceiling height, load, and tray configuration. Splice Plates and Couplers: Used to join tray sections, these must match the tray material to prevent galvanic corrosion.

Stainless steel or galvanized couplers are common. Washers and Lock Nuts: Square or flat washers distribute load, while lock nuts prevent loosening due to vibration. Grounding Straps: Copper bonding jumpers ensure electrical continuity across tray sections, critical for safety in metal trays.

Material Selection Guidelines

Indoor Dry Areas: Electro-galvanized steel or aluminum is sufficient. Outdoor or Industrial Wet Areas: Hot-dip galvanized steel or stainless steel is recommended. Chemical or Food Processing Plants: Stainless steel (316L) is preferred for chemical resistance.

Coastal or High Humidity Areas: HDG steel or stainless steel prevents premature corrosion.

Installation Considerations

Support Spacing: Typically 1. 5–2 meters for heavy power cables, up to 3 meters for light data cables. Hanger Types: Trapeze (swing) hangers for heavy loads, single rod for light cables, wall brackets for high ceilings or obstructions.

Corrosion Prevention: Match tray and hardware materials to avoid galvanic corrosion; use appropriate coatings. Pre-cut Rods and Beam Clamps: Save installation time and reduce on-site cutting errors. Selecting the correct materials and hardware ensures structural integrity, long-term durability, and compliance with NEC/CEC standards, while preventing sagging, corrosion, and electrical hazards.

Proper planning and material choice are critical for safe and efficient cable tray hanger installation.