For reliable, long-term prevention of frost heave under industrial freezer units, Delta-Therm uses only Mineral Insulated (M.I.) cable assemblies to maintain the optimum temperature of the permafrost layer beneath freezer floors. Delta-Therm M.I. cable assemblies are UL Listed and CSA Certified for permafrost prevention. They’re easy to install, and resist fire and degradation over time. All of our thermostats are UL Listed and rated from NEMA 1 to NEMA 4X. Essential accessories are provided with each system. Post-installation wiring inspections will extend the warranty period of Delta-Therm M.I. cable to 10 years.