FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Question: 1 / 1030

When used in fire detection systems with a single indicator light, how are thermal switches wired?

In series with each other

In parallel with each other and in series with the light

Thermal switches are typically wired in parallel with each other and in series with the indicator light in fire detection systems to ensure that all switches must detect a rise in temperature before the light will be activated. This means that if any of the switches do not detect heat, the circuit will remain open and the light will not turn on. Additionally, if they were wired directly to the power source (D) or in parallel with the light (C), the circuit would close and the light would turn on even if only one switch detected heat. Wiring the switches in series with each other (A) would not allow for any redundancy and could result in failure if one switch were to malfunction.

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In parallel with the light

Directly to the power source

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