NEC Commercial Electrical Practice Test

Busways must be securely supported at intervals not exceeding how many feet?

1. 5 feet

2. 10 feet

3. 3 feet

4. 8 feet

The correct answer is: 5 feet

Busways are designed to carry electrical currents and are used in various commercial and industrial applications. According to the National Electrical Code (NEC), busways must be securely supported to ensure safety and performance. The requirement for maximum support intervals is critical to prevent sagging or excessive stress on the electrical conductors. The correct answer is that busways must be securely supported at intervals not exceeding 5 feet. This close spacing helps maintain the structural integrity of the busway and reduces the risk of mechanical damage or stress that could lead to failure. Proper support also ensures that the busways are adequately aligned, reducing the chance of electrical faults or hazards. This requirement is particularly important in environments where busways may experience vibrations or other mechanical forces that can compromise their stability. By adhering to this 5-foot interval, electricians and engineers can ensure that the busways remain safe and reliable over time, minimizing the risk of electrical hazards in commercial settings.