TTS™ Self-regulating heating cable for pipe freeze protection. TTS cut-to-length self-regulating heating cables are designed to provide freeze protection to metallic and non-metallic piping. TTS cables are approved for use in ordinary (non-classified) and hazardous (classified) areas. Suitable for freeze protection or low temperature maintenance, metallic or non-metallic piping, tanks and equipment, sewage pipes, intake and drain lines (external tracing only), water meters and outside pipes/taps, water pipes in unheated areas, sprinkler systems, refrigeration applications.