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CEDIA ESPA EST Practice Test

Category - DHTI

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Which of the following is the maximum number of conductors available in thermostat wiring?

Two
Seven
Four
Ten

Explanation

Answer - B - The maximum number of conductors available in thermostat wiring is seven.

Key Takeaway: The wiring used to connect a thermostat to the HVAC systems should be no less than 20-gauge wire. If the wires run longer than 100 feet, 18-gauge wire is recommended.
Thermostat wiring has two to seven conductors of solid core wiring. The color-coding for a seven-wire cable is white, red, green, blue, yellow, brown, and orange.

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