Installing cable trays at varying elevations requires taking multiple measurements to align them. They are not intended to be used as ladders, walk ways or support for people as this can cause personal injury and also damage the system and any. 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 industrial applications. A properly designed and installed cable tray system will provide. The cable support lengths and fittings can basically be designed as cable trays, cable ladders or mesh cable trays, in which cables are routed. - HV Cable laying and termination work.