Galvanized Cable Trays in New Zealand

Galvanized cable trays in New Zealand provide durable, corrosion-resistant support for electrical and data cabling, suitable for commercial and industrial installations.

Types of Galvanized Cable Trays

In New Zealand, galvanized cable trays are available in pre-galvanized (Galvabond) and hot-dip galvanized (HDG) finishes, offering protection against corrosion for both indoor and outdoor applications . Common types include:

• Ladder trays: Open design with rungs for heavy cables, excellent ventilation, and easy access for maintenance .
• Wire mesh or basket trays: Lightweight, flexible, and suitable for data and light power cabling .
• Trough or solid-bottom trays: Provide maximum protection for sensitive or small instrumentation cables .
• Single rail trays: Used for lighter loads or aesthetic-sensitive installations .

Material and Finish Considerations

Galvanized steel trays are coated with zinc to prevent corrosion. Pre-galvanized trays are coated before fabrication, while hot-dip galvanized trays are coated after fabrication, offering thicker protection and better durability in harsh environments . Some suppliers also offer powder-coated or custom-painted finishes for architectural or specialized requirements .

Installation Guidelines

• Support spacing: Typically, supports are installed at regular intervals depending on tray type and load. Ladder trays often allow spans of 1.5–3 meters, while solid-bottom trays may require closer support .
• Modular assembly: Most trays use splice plates, link plates, and T-brackets for quick assembly and flexibility .
• Load capacity: Medium-duty trays like FDG CT3 and CT5 can support loads from 35 kg/m to 220 kg/m depending on width and span .
• Cable securing: Cables should be fastened to rungs or tray bottoms to prevent sagging and maintain spacing, especially for multi-conductor or heavy power cables .
• Compliance: Installations should comply with NZS 4219:2009, AS/NZS 4680:2006, and other relevant New Zealand standards for structural and corrosion protection .

Suppliers in New Zealand

Several suppliers provide galvanized cable trays and accessories:

• Equip Supply Ltd: Stern Cable Trays in Galvabond and HDG finishes, suitable for commercial and industrial projects .
• Mechanical Support Systems (MSS): EMT and Kiwitray systems in pre-galvanized or hot-dip galvanized finishes .
• FDG NZ: FDG CT3 and CT5 trays, modular, adjustable, and compliant with NZ standards .
• Ideal Electrical Suppliers: Wide range of pre-galvanized and HDG trays, including splice plates and accessories .
• EzyStrut: Pre-galvanized and hot-dip galvanized trays with custom options for high-load or specialized installations .

Best Practices

• Ensure proper ventilation for heat dissipation in ladder or wire mesh trays.
• Avoid overloading trays beyond specified allowable loads.
• Use modular fittings to allow future cable additions or reconfiguration.
• Consider environmental exposure: HDG trays are preferred for outdoor or high-moisture areas.
• Follow manufacturer instructions for splice plates, hold-down brackets, and radius bends to maintain structural integrity . By selecting the appropriate galvanized tray type, finish, and installation method, electrical infrastructure in New Zealand can achieve durable, safe, and compliant cable management for a wide range of applications.