Typical support spacing for steel cable trays ranges from 1. 5 meters to 6 meters depending on tray size, material gauge, and load conditions. Although BS 7671 touches on the subject of cable supports, it does not detail specifically what these support distances should be. 8 (Other Mechanical Stresses (AJ)) in that document provides requirements for cable support. Clause 522-08-04 Where conductors or cables are not supported. The safety of your people and the reliability of your electrical system depend on proper cable tray support spacing. Proper installation can significantly reduce electromagnetic interference, prevent fire hazards, and improve overall efficiency. This article provides an in-depth. Is your cable tray system optimized for safety, dependability, space and cost savings? Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and. eferred to support and protect numerous small instrumentation and control cables. Because of its closed design, this type of tray should e used in applications where there is minimal risk of heat generation and buildup.