Recreational Vehicle (RV) Technician Practice Test

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Prepare for the RV Technician Test. Utilize flashcards and multiple choice questions with helpful hints and explanations. Get exam-ready!

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What is the minimum amp breaker required to protect a 120V water heater with a 1400 watt element?

10 amp
15 amp
20 amp
25 amp

The correct answer is: 15 amp

To determine the minimum amp breaker required for a 120V water heater with a 1400-watt element, you can use the formula for calculating amperage, which is: Amps = Watts / Volts In this case, the calculation would be: Amps = 1400 watts / 120 volts = 11.67 amps The National Electrical Code (NEC) typically requires that you size breakers to be at least 125% of the continuous load. Since the element operates continuously, you would multiply the 11.67 amps by 1.25: 11.67 amps x 1.25 = 14.59 amps To select a standard breaker size that can accommodate this requirement, you would round up to the next standard breaker size, which in this case is 15 amps. This ensures that the circuit can handle the load without tripping under normal operating conditions while also providing sufficient protection for any potential overload situations. Therefore, the minimum amp breaker required for a 120V water heater with a 1400-watt element is 15 amps, which aligns with the calculated requirements for safety and performance standards.