Insulated Thermocouple Wire Considerations

There are many different types of thermocouple wire insulation based on the specific application required for each use.  Generally, the larger the wire diameter, the less flexible it will be.  The smaller the diameter flexibility increases but at the cost of strength.  The most common sizes are 20 and 24 awg solid or stranded.  30 and 36 awg sizes are also used for special applications.  Stranding will increase the flexibility with a minimal increase in overall diameter.   As you may assume the better the insulation is for temperature, moisture and abrasion resistance, the higher the cost.