How far must fasteners for a run of conduit be placed apart at a minimum?

The minimum distance for placing fasteners for a run of conduit is determined by the National Electrical Code (NEC) standards, which state that conduits should be securely fastened at intervals to ensure stability and integrity. According to NEC regulations, for standard-sized conduits, the requirement is typically that fasteners be placed no more than 10 feet apart. However, specific conditions or types of conduits can alter this standard.

In the case of the option provided, placing fasteners 4 feet apart aligns with commonly accepted practices for ensuring the securement of various conduits, particularly where vibration or movement might be an issue. This spacing helps maintain the conduit in a stable position without allowing it to sag or fall out of alignment, which could pose safety risks and reduce the effectiveness of the fire alarm and electrical systems.

Overall, following the specified minimum distance for fasteners helps ensure compliance with safety codes and standards, supporting the integrity of the installation and facilitating proper functioning in the face of fire safety concerns.