Final answer:
The wiring diagram for a contactor-controlled compressor, operated by a single-pole single-throw switch. Safety features like circuit breakers and protective casings must be included, and potential voltage drops in high-current scenarios should be considered.
Step-by-step explanation:
The student's wiring diagram to control a compressor using a contactor that is operated by a single-pole–single-throw (SPST) switch. A basic diagram would show a power source connected to a line terminal of the contactor. The contactor's load terminal would be connected to the compressor. The SPST switch would be connected in series with the coil of the contactor. When the switch closes, current would flow through the coil, creating a magnetic field that closes the contactor's contacts, thereby supplying power to the compressor.
The circuit should include safety features such as a circuit breaker or fuse to prevent thermal overload and a protective casing to avoid electrical contact and shocks. Note that high-current situations like motor control circuits can create additional considerations, such as the voltage drop explained in Figure 21.7.