What is the required square inch measurement for an electrical raceway serving an exit passageway and terminating at a steel box?

The required square inch measurement for an electrical raceway serving an exit passageway and terminating at a steel box is determined by applicable codes and standards, ensuring safe and efficient electrical installations in critical areas, such as exit passageways.

When considering the correct answer of 16 square inches, this measurement is typically based on the purpose of ensuring that the electrical raceway can adequately support the wiring and is in compliance with fire safety regulations.

In an exit passageway, the electrical systems must meet certain fire-resistance criteria to minimize the risk during an emergency. The size of the raceway is crucial as it affects both the physical space available for wiring and the overall safety of the exit route.

This context helps reinforce why a specification such as 16 square inches is necessary in this scenario. Such measurements are often dictated by national codes, like the National Electrical Code (NEC), where specific sizes are outlined based on the type of facility, anticipated traffic, and safety requirements.

Overall, the choice of 16 square inches aligns with these standards, highlighting the importance of adherence to code requirements to ensure safe egress during emergencies.