At what intervals must flexible metal conduit be secured?

• A. 3.0 ft
• B. 4.5 ft
• C. 6.0 ft
• D. 5.0 ft

Answer: (B)

Flexible metal conduit must be secured at intervals of 4.5 feet. This requirement ensures that the conduit is properly supported to prevent mechanical damage or strain on the wiring it contains. By securing the conduit within this specified range, you ensure that it maintains its integrity and remains safe for use in electrical systems. This provision aligns with safety standards and codes set forth by organizations such as the National Electrical Code (NEC), which aim to promote safe and reliable electrical installations. The specific interval of 4.5 feet is also designed to accommodate the flexibility of the conduit, allowing for some movement while still providing adequate support.