So, straight away, Zone 0 is a no-go for cable trays. In Zone 1, you need trays designed to contain an explosion or stop sparks getting out. Picking the right material for Cable Trays in Chemical Plants. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. 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. MI, mineral insulated cable, with. The classic European explosion protection (Directive 2014/34/EU, hereinafter, ATEX Directive") refers to a device, for example, a lamp, a measuring instrument, a camera, or the like. Safety of such devices is usually ensured by the use of one or several ignition protection types which are clearly. cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or.