PVC is rated for applications up to 600 volts, while XLPE can handle up to 2000 volts or more with greater dielectric strength. Type TC (Tray Cable) tray-rated cables will be the most common type you will see on the market. 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. In general, tray rated cables are quality products that have been tested to withstand the rigors of severe environments. They are protected by either a plastic Jacket or metal armor over individual conductor insulations. They can be rated for outdoor, indoor, for corrosive areas, for hazardous. 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. THHN insulation consists of polyvinyl chloride (PVC) insulation with a nylon sheath. Today's industrial production environment is a digital environment.