Thermon Heat Tracers Pvt. Ltd. Manufactures Resistance Constant Watt Heating Cable. Thermon Heat Tracers Pvt. Ltd is an ISO 9001 certified company. The Company also manufactures various types of wires and cables. The Resistance Constant Watt Heating Cable of TESL series are used where circuit lengths exceed the limitations of parallel resistance heating cables. The Resistance Constant Watt Heating Cable can withstand temperature exposures associated with steam purging. This Cable has Operating Voltage of 600 VAC and Maximum Exposure Temperature of 260 Degree C.