IRC Electrical Inspector Practice Exam

The minimum requirement for branch circuits supplying bathroom receptacle outlets is a 20-amp circuit. This requirement is based on the National Electrical Code (NEC), which emphasizes safety and the proper handling of electrical loads in areas prone to higher moisture levels, like bathrooms.

A 20-amp circuit provides adequate capacity to handle multiple appliances or devices typically used in bathrooms, such as hair dryers, which can draw significant current. This helps reduce the risk of circuit overloads and potential electrical hazards in environments where water is present, ensuring user safety and compliance with electrical standards.

The options that suggest either a single 15-amp circuit or two 15-amp circuits do not meet the safety requirements for bathrooms, as they lack sufficient capacity for modern bathroom appliance loads. A 30-amp circuit is unnecessary and inappropriate for standard receptacle outlets in such settings, as it exceeds the necessary protection for typical household uses and could pose a safety risk if not properly managed. Thus, a 20-amp circuit is the mandated minimum to adequately support bathroom receptacle needs while ensuring compliance and safety.