Illinois Home Inspector Practice Exam

What is a 240-volt circuit breaker typically referred to as?

1. Single pole breaker

2. Double pole breaker

3. Triple pole breaker

4. Quadruple pole breaker

The correct answer is: Double pole breaker

A 240-volt circuit breaker is referred to as a double pole breaker because it is designed to connect to both phases of a 120/240-volt electrical system. Each phase carries 120 volts, and combining two of these phases provides the necessary 240 volts for higher power appliances and equipment. In a typical residential setting, a double pole breaker has two handles, which allows it to control both circuits simultaneously, providing a balanced load and ensuring safety. This type of breaker is essential in circuits that require more power, such as for electric dryers, water heaters, and certain HVAC systems. The other options do not apply in this context. A single pole breaker connects to only one phase and is used for 120-volt applications. A triple pole breaker would handle three phases, generally for industrial or specialized applications, while a quadruple pole breaker would manage four phases, which is not typical in standard residential wiring. Thus, the designation of a double pole breaker is specifically appropriate for 240-volt circuits as it reflects its function and configuration in the system.