ICC Residential Electrical Inspectors Practice Exam

How many branch circuits are required to supply bathroom receptacle outlets according to NEC regulations?

1. One per circuit

2. Two per circuit

3. Three per circuit

4. Four per circuit

The correct answer is: One per circuit

According to the National Electrical Code (NEC) regulations, specifically in Section 210.11(C)(3), at least one 20-ampere branch circuit is required to supply at least one bathroom receptacle outlet. This rule is established to ensure that there is adequate power available for the circuits that serve bathroom areas, which often require dedicated circuits due to the potential for high power draw from devices such as hair dryers and other personal care appliances. This requirement helps to prevent overload conditions that could lead to tripped breakers or, in less favorable conditions, electrical fires. While the NEC provides for flexibility and safety in electrical design, it mandates that at least one circuit must be dedicated to serve bathroom receptacles specifically to enhance safety and functionality in these wet locations. The other options suggest a higher number of circuits than what is required, which does not align with the NEC's minimum requirements for bathroom receptacle outlets. Therefore, the single branch circuit provision establishes a clear standard for safety and adherence to successful electrical installation practices in residential settings.