When selecting thermocouple wire, factors to consider include the temperature range of the application, the compatibility with the thermocouple type, the insulation material and its resistance to environmental conditions, and the required wire gauge and length for proper installation.

Extending or splicing thermocouple wire should be done carefully to avoid introducing errors in temperature measurement. If necessary, it is recommended to consult the manufacturer's guidelines or seek assistance from a qualified technician to ensure proper extension or splicing techniques are followed.

The lifespan of thermocouple wire depends on various factors, such as the operating conditions, the quality of the wire, and the level of wear and tear it experiences. Regular inspections and maintenance should be carried out, and thermocouple wire should be replaced if signs of damage, degradation, or loss of accuracy are detected.