Gas Fitter Practice Test

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How is a 240-volt power supply typically sourced in a residential circuit?

Line side of one branch circuit breaker and the line side of the second breaker
Load side of one main circuit breaker and the load side of the second main circuit breaker
Load side of one branch circuit breaker and the load side of the second branch circuit breaker
Line side of one main circuit breaker and the line side of the second main circuit breaker

The correct answer is: Line side of one branch circuit breaker and the line side of the second breaker

A 240-volt power supply in a residential circuit is typically sourced from the line side of two separate branch circuit breakers. This configuration allows for the use of both phases of power in the electrical system, which are usually provided by a split-phase service in North America. By connecting to the line side of two different circuit breakers, each of which taps into one of the two hot legs of a 120/240V service, you effectively create the necessary 240 volts. This setup is crucial for powering larger appliances that require more voltage, such as dryers, stoves, and HVAC systems. Each branch circuit breaker provides a 120-volt supply relative to the neutral line, so when connected together in this way, the voltage between the two phases creates the desired 240-volt circuit. Understanding this is essential for safe installation and operation, and it highlights the importance of correctly identifying breaker configurations in both residential and commercial electrical systems.