Which of the following statements is true regarding the installation of straps on flex?

Straps are crucial when installing flexible conduit, as they help secure the flexible flex to prevent sagging or movement that could lead to damage or safety hazards. The correct answer indicates that straps should be installed every 4 feet 6 inches of flex, which is in accordance with industry standards and guidelines to ensure proper support and stability of the conduit. This regular spacing helps maintain the integrity of the installation and ensures that the flex does not experience undue stress or strain.

The other statements do not align with the established protocols for installing flex. For example, suggesting that straps should only be placed every 10 feet does not account for the necessary support needed in between, potentially compromising safety and functionality. Proposing that straps are used only at junction points neglects the requirement for ongoing support throughout the length of the installation. Lastly, stating that straps are optional for short lengths of flex is misleading, as all lengths of flex should be adequately supported regardless of their size to adhere to safety regulations and best practices.