What is the maximum distance between supports for 1 inch rigid nonmetallic conduit?

The correct answer indicates that the maximum distance between supports for 1 inch rigid nonmetallic conduit is 3 feet. This measurement is established by the National Electrical Code (NEC), which sets standards for electrical installations, including conduit support spacing.

Rigid nonmetallic conduit, often made from PVC or similar materials, must be properly supported to prevent sagging or bending, which can make the conduit susceptible to damage and compromise electrical code compliance. The support requirements are based on the conduit size and material, ensuring that it remains secure and maintains its integrity over time.

While the other distances listed may seem reasonable, they do not align with the NEC requirements for this specific type and size of conduit. In a practical scenario, exceeding the recommended support distance could lead to potential issues, such as increased strain on joints and connections, exposure to physical damage, and difficulties in maintenance or inspection. Thus, adhering to the 3-foot maximum support distance is crucial for safety and performance in electrical installations.