How are insulated thermocouple wires identified?
The insulation used on thermocouple wire is usually color coded for easy identification. Common guidelines include that the negative lead in insulated thermocouple wire is red. The positive lead has the color of the thermocouple as well as the overall color of insulated extension grade wire. The outer jacket of thermocouple grade wire is typically brown. For high temperature wire, it is common to have a color coded tracer thread in the white material. For information on usable temperature ranges for the insulation see the “Wire Insulation Identification” table. Other tables at this link are also available for information on the metals used in the thermocouple wire, insulation color codes, and more.
