Swiss cable trays must comply with European directives, CE marking, and international standards for materials, load capacity, and corrosion protection.

Standards and Compliance

Cable trays in Switzerland are generally required to meet European and international standards, including CE marking for electrical safety and environmental compliance, as well as ISO 1461 for galvanization and ASTM A123 for steel quality (ABB) . National authorities may enforce additional inspections or certifications, such as IMQ or LCIE, to ensure compliance with safety and performance requirements . Cable trays must also conform to NEMA VE 1-2017 for metal cable tray systems and ANSI/NFPA 70 (National Electrical Code) for electrical safety .

Materials and Surface Treatments

Common materials include:

• Pre-galvanized steel: Economical, suitable for indoor commercial applications, with sacrificial zinc protection against corrosion .
• Hot-dip galvanized steel: Thicker zinc coating for outdoor or harsh environments, providing enhanced corrosion resistance .
• Stainless steel (AISI 316L/316): High corrosion resistance, often used in chemical or marine environments .
• Aluminum: Lightweight and corrosion-resistant, suitable for specific industrial applications. Surface treatments and finishes are selected based on environmental exposure, with galvanization or stainless steel preferred for high-humidity or corrosive conditions .

Types and Design

Cable trays are available in several configurations:

• Ladder trays: Open rungs for maximum ventilation and cable support, suitable for high-capacity power cables .
• Ventilated trays: Perforated or slotted bottoms for airflow and heat dissipation .
• Solid-bottom trays: Provide protection against dust, debris, and electromagnetic interference .
• Wire mesh trays: Lightweight, flexible, and ideal for light instrumentation or data cables . Rung spacing typically ranges from 150 to 230 mm, depending on cable type and load requirements . Some trays include Ty-Rap® slots for secure cable fastening .

Load Capacity and Installation

Cable trays are designed to support the weight of cables without deformation. Load ratings depend on material, width, and span between supports. Stainless steel and hot-dip galvanized trays offer higher structural strength for heavy-duty applications . Proper installation ensures minimum bend radius for cables and maintains electrical continuity and grounding .

Electrical and Fire Safety

Cable trays must maintain electrical continuity and proper earthing. Fire-resistant materials and coatings are recommended for installations where heat or fire risk is significant. Compliance with short-circuit and electromagnetic performance standards is also required .

Suppliers in Switzerland

Swiss distributors like Distrelec stock a wide range of cable trays, including ladder, ventilated, and solid-bottom types, with next-day delivery and technical support . Major manufacturers such as ABB and Legrand provide detailed technical guides and CAD/BIM models for design and specification . In summary, Swiss cable tray specifications emphasize compliance with European and international standards, material selection for corrosion resistance, structural strength, and proper installation practices to ensure safety and reliability in electrical installations.