NEC Commercial Electrical Practice Test

What is the minimum height for entrances to large equipment spaces containing over-current devices?

1. 5 feet

2. 6 feet

3. 7 feet

4. 8 feet

The correct answer is: 6 feet

The minimum height requirement for entrances to large equipment spaces containing over-current devices is defined to ensure safe access and operation. The correct answer is 6 feet, which is the minimum clearance needed to allow personnel to move freely without the risk of contact with equipment or devices installed above. This height standard is particularly important for ensuring that maintenance personnel have adequate space to work safely, and it helps prevent potential accidents that could arise from working in cramped conditions. The National Electrical Code (NEC) emphasizes safe practices in electrical installations, and these height standards are part of ensuring systems are accessible without hazards. While the other options represent heights that may seem reasonable, they do not meet the NEC’s specific requirements, which are designed for functionality and safety in industrial and commercial environments.