Large span cable trays are designed to support heavy cable loads across long distances without intermediate supports. 126,000 feet of cable installed in a single outage! Snake Rack™ your cables in tunnels! Install the backbone support structure for what you need now and for future growth. All Snake Tray. ass reinforced polyester) cable trays. All Snake Tray. 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. Made from high-strength galvanized steel or stainless steel, these.