TW/THW, or tracer wire, is used for general purpose wiring circuits, machines tool wiring, and internal wiring of appliances.
This type of wire is also found in residential, commercial and industrial buildings. Tracer wire is intended for use in dry areas not exceeding 90 degrees celsius, or around 200 degrees Fahrenheit. The insulation on TW/THW wire is a heat and moisture resistant polyvinyl compound (PVC).
Used to accurately locate underground pipes and lines. Tracer is laid alongside the pipes or lines during installation in order to find them at a later date for safe digging.
The conductor is a solid of stranded copper per spec ASTM B-1, B-3, or B-8
Insulation is yellow, high molecular weight polyethylene (HMWPE) ASTM D-1248
Operating temperature is 70 degrees celsius dry and wet
Voltage in 20 and 30 mil + 30-300 (45 mil+600 volts)