ICC Residential Electrical Inspectors Practice Exam

Where should the service disconnecting means be located according to the National Electrical Code?

1. At the center of the building

2. Nearest the point of the entrance of the service conductors

3. In the basement of the building

4. Within 30 feet of the main service panel

The correct answer is: Nearest the point of the entrance of the service conductors

The service disconnecting means is a crucial component of the electrical system in a residential building, serving as a safety feature that allows for the disconnection of electrical power in case of emergency or maintenance. According to the National Electrical Code (NEC), the service disconnecting means must be located at the nearest point of entrance of the service conductors. This requirement ensures that the disconnect is easily accessible and allows for a quick shutdown of power to the building. By placing the disconnecting means close to where the service conductors enter the building, it minimizes the distance that needs to be traveled in order to disconnect electrical service, enhancing safety for both residents and emergency responders. This location facilitates a more organized electrical system, helps prevent electrical hazards, and complies with code requirements that often dictate that the disconnect must be readily accessible. Other options, like placing the disconnect at the center of the building, in the basement, or within a specific distance from the main service panel, do not fulfill the criteria set forth by the NEC for accessibility and safety, making the second option the correct choice.