What if i IEC standard thermocouple wire is connected to ANSI standard TC connector ?

If you use an IEC standard thermocouple wire and connect it to an ANSI standard connector, the physical connection will work because the connectors are generally interchangeable in size and design. However, you will get an incorrect temperature reading or no reading at all due to mismatched polarity. 

The crucial problem is the difference in wiring polarity standards:

• In the ANSI standard, the negative lead is always red, and the positive lead has a different color depending on the thermocouple type (e.g., yellow for Type K).

• In the IEC standard, the negative lead is always white, and the positive lead has a color depending on the type (e.g., green for Type K). 

  
  

Here is what happens for a common Type K thermocouple:

• IEC Wire: Green (+) and White (-)

• ANSI Connector: Yellow (+) and Red (-) 

  
  

If you follow the color coding on the ANSI connector (connecting green wire to yellow pin and white wire to red pin), you will reverse the polarity in the circuit. This results in the voltage being generated in the wrong direction, which will lead to a significant error in the measurement, or an error that gets worse as the temperature changes. 

To make it work correctly, you must ignore the connector's color and match the wire's polarity based on the correct function (positive to positive, negative to negative). For example, with IEC Type K wire and an ANSI Type K connector, you must wire the green wire to the yellow connector pin and the white wire to the red connector pin. 

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