NCIDQ IDFX Practice Exam

What is depicted by a one-line diagram prepared by an electrical engineer?

1. The overall architecture of the building

2. A detailed construction schedule

3. The electrical system from primary feed to panel boxes

4. The layout of plumbing facilities

The correct answer is: The electrical system from primary feed to panel boxes

The one-line diagram, also known as a single-line diagram, is a simplified representation of the electrical system in a building. It illustrates the electrical distribution system from the primary feed—where the electricity enters the building—down to the various panel boxes throughout the facility. This diagram provides a clear and concise view of the connections and components of the electrical system, including transformers, circuit breakers, and load connections, all rendered in a single line format. This representation is useful for understanding the flow of electricity and the overall layout of the electrical distribution without delving into the complexity of multi-line drawings that include every individual wire or component. A one-line diagram is essential for electrical engineers to analyze the system's capacity, configuration, and safety aspects, making it a crucial tool for planning and troubleshooting electrical systems in buildings. The other options do not align with the purpose of a one-line diagram, as they pertain to areas outside electrical engineering specifically, such as architectural design or construction scheduling.