Electrician's Licensing Practice Exam

Why do stoves require a four-wire system?

1. For clock operation alone

2. To provide additional grounding

3. Two hots operate the stove neutral

4. For appliance efficiency

The correct answer is: Two hots operate the stove neutral

The requirement for a four-wire system for stoves primarily relates to the need for both safety and functionality. In a four-wire configuration, there are two hot conductors, one neutral, and one ground. This arrangement allows for a 240-volt circuit, which is typically required for electric stoves to ensure efficient operation and adequate power supply for the heating elements. The two hot wires provide the necessary voltage, while the neutral wire is essential for carrying unbalanced loads, particularly if the stove includes components that operate at lower voltages, such as lights or electronic controls. This arrangement helps mitigate the risk of shock and makes sure that each element of the stove functions properly without the risk of overloading the circuit. Grounding in this system also enhances safety by providing a path for fault current in the case of a short circuit, reducing the risk of electrical shock or fire. The use of a neutral wire assists in maintaining proper voltage levels and safety protocols by allowing devices that require 120 volts to function while still accommodating the 240-volt operation needed for stove performance. Thus, the option that indicates two hots operating the stove neutral highlights the essential mechanics of how electric stoves utilize a four-wire system, making this choice the most accurate.