Residential HVAC Installation Practice Exam

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What is the typical gauge wire used in low voltage control circuits?

  1. A. 16 gauge

  2. B. 18 gauge

  3. C. 20 gauge

  4. D. 22 gauge

The correct answer is: B. 18 gauge

Low voltage control circuits typically use smaller gauge wire in the range of 18-22 due to their lower power needs. 16 gauge wire may be considered too large and unnecessary for these types of circuits. Similarly, 20 and 22 gauge wire may be too slim and may not be able to handle the current and voltage requirements of the circuit. Therefore, option B (18 gauge) is the best choice for typical low voltage control circuits.

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