Should the low-voltage electrical shaft be equipped with cable trays or conduits

Low-voltage electrical shafts can be equipped with either cable trays or conduits depending on mechanical protection, cable quantity, and installation requirements, with trays preferred for large bundles and conduits for exposed or hazardous areas.Cable TraysCable trays are ideal for supporting multiple low-voltage cables in a shaft, especially when there is a need for easy installation, future expansion, and organized routing. They provide:Mechanical support for large numbers of cables without the need for individual conduits .Ease of maintenance and upgrades, as cables can be added or removed without dismantling the system .Segregation of cable types, such as separating power and data cables to reduce electromagnetic interference .Compliance with standards like IEC 61537, which defines tray design, bend radii, and support spacing . Cable trays are generally installed along rigid partitions and can include ladders, troughs, or wire-mesh trunking. They are secured to prevent lateral or vertical movement and often include protective covers to prevent damage during installation .ConduitsConduits provide enhanced mechanical protection for cables, particularly in exposed, hazardous, or high-traffic areas. Key points include:Protection against physical damage, moisture, and chemical exposure .Suitable for low-voltage control or data cables that require additional shielding or isolation .Compliance with IEC 61386, which specifies conduit material, routing, and bend limitations .Often used in underground or outdoor applications, or where IP-rated protection is required . Conduits are more labor-intensive to install and modify compared to trays, but they are essential where cables are at risk of mechanical stress or environmental hazards.Best PracticesAssess cable quantity and type: Use trays for large bundles and conduits for sensitive or exposed cables .Segregate power and data cables to minimize electromagnetic interference .Plan for future expansion: Ensure trays or conduits have sufficient reserve space (typically 50% extra capacity) for additional cables .Follow EMC and safety standards: Proper earthing, spacing, and routing are critical to meet safety and electromagnetic compatibility requirements . In summary, low-voltage shafts often use a combination of cable trays and conduits: trays for bulk cable management and conduits for protection in critical or exposed sections. The choice should be guided by mechanical protection needs, cable type, installation environment, and compliance with IEC and local electrical codes.