A Quick Guide to Thermocouple Wire Color Coding

Using the wrong thermocouple wire can be a costly mistake. Consistent labeling is key when it comes to differentiating exactly which types of thermocouple wire you’re working with or which types you need to order. That’s why there are established color codes in place to help.

There are two governing bodies that have developed color codes that are generally accepted around the world: The American National Standards Institute (ANSI) and the International Electrotechnical Commission (IEC). The color code you should follow depends on where you are. GeoCorp is in the U.S., so we follow ANSI color codes, while IEC standards are international.

There are plenty different types of thermocouples, so it’s good to get on the right page when it comes to color codes.