Home Inspection Electrical Practice Test 2026 - Free Home Inspection Electrical Practice Questions and Study Guide

In a typical residential electrical service setup in the United States, three wires often refer to two hot wires and a neutral wire. This configuration can provide either 120 volts or 240 volts depending on how the system is wired.

When a home receives power from a split-phase system, it usually features two hot wires, each providing 120 volts with respect to the neutral wire. When you utilize the voltage across both hot wires, you effectively get 240 volts. This is the standard for larger appliances, such as dryers and ovens, which require more power to operate.

Thus, the correct interpretation of the three wires entering a home with respect to their voltage is that they can deliver 240 volts when used together from the two hot wires. The context of residential electrical wiring commonly involves these voltages, making this understanding crucial for assessing and working with home electrical systems.