Which statement is true regarding thermocouple extension wires?

Thermocouple extension wires are specifically designed to match the characteristics of the thermocouple types they are intended to extend. Utilizing extension wires that are appropriate for the specific thermocouple type helps ensure accurate temperature readings by preserving the thermoelectric characteristics of the junction. In most installations, the requirement for extension wires is that they should be appropriately matched to the thermocouple type to maintain accuracy and minimize errors due to thermal or electrical resistance.

Using matched extension wires also helps to mitigate issues such as cold junction compensation, which is crucial for accurate temperature measurement. Therefore, stating that it is true in most installations recognizes that having the right extension wires is a common practice necessary for optimal functioning of thermocouple sensors.