Where should metal straps be placed on flexible conduit?

• A. Within 3 inches of boxes and 3 feet from couplings
• B. Within 12 inches of boxes and every 4 feet 6 inches of flex
• C. No more than 10 feet between straps and 3 feet from couplings
• D. Along every 8 feet of conduit

Answer: (B)

The placement of metal straps on flexible conduit is critical for ensuring proper support and stability of the wiring. Flexible conduits are designed to be used in a manner that allows for some movement and flexibility, but they still require adequate support to prevent strain on the wiring contained within.

The choice indicating that straps should be positioned within 12 inches of boxes and every 4 feet 6 inches of the flexible conduit is correct because it aligns with the general electrical codes and practices. This requirement ensures that the conduit is secured closely to the junction boxes where electrical connections are made, minimizing stress and potential damage as the conduit shifts or moves. Additionally, spacing the straps every 4 feet 6 inches provides regular support along the conduit run, preventing sagging and maintaining the integrity of the installation.

In contrast, other responses either lack sufficient support intervals or exceed the recommended distance between straps, which could lead to safety issues or code violations. Proper placement of the straps is essential for both the safety of the installation and compliance with electrical standards.