ICC Residential Electrical Inspectors Practice Exam

What is the minimum number of branch circuits needed for receptacle outlets in a detached garage with electric power?

1. One 15 Amp

2. One 20 Amp

3. Two 20 Amp

4. Two 15 Amp

The correct answer is: One 20 Amp

In a detached garage with electric power, the minimum requirement for branch circuits providing receptacle outlets is typically governed by the National Electrical Code (NEC), which emphasizes safety and practicality. The code stipulates that at least one 20 Amp branch circuit is necessary to ensure that sufficient power is available for general use, including lighting and running typical electric tools and equipment found in a garage. Choosing a 20 Amp circuit provides the flexibility to supply power to several receptacles without the risk of overloading. Since garages can often have multiple outlets for various equipment, having a 20 Amp circuit allows for greater capacity compared to a 15 Amp circuit, which may not accommodate more significant or simultaneous power demands effectively. While having more than one circuit can increase convenience and capacity for numerous devices, the question specifically pertains to the minimum number of circuits required, leading to the selection of a single 20 Amp circuit as the most practical and compliant choice.