What color is the positive wire on a thermocouple?

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Prepare for the NRCC Instrumentation Test. Study with flashcards and multiple-choice questions, each complemented with hints and explanations. Gear up for your exam success!

Multiple Choice

What color is the positive wire on a thermocouple?

Explanation:
Positive thermocouple leads are color-coded to reflect the designated polarity of the dissimilar-metal pair. For the common Type K thermocouple (Chromel–Alumel), the positive leg is wired with red, while the negative leg is blue. This polarity matters because the thermocouple voltage changes sign if the leads are swapped, causing the temperature reading to invert. So the red wire is the positive lead. Note that other thermocouple types use different color schemes, but red being positive is standard for many Type K applications.

Positive thermocouple leads are color-coded to reflect the designated polarity of the dissimilar-metal pair. For the common Type K thermocouple (Chromel–Alumel), the positive leg is wired with red, while the negative leg is blue. This polarity matters because the thermocouple voltage changes sign if the leads are swapped, causing the temperature reading to invert. So the red wire is the positive lead. Note that other thermocouple types use different color schemes, but red being positive is standard for many Type K applications.

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