Which installation practice is crucial for ensuring the stability of conduits in a building?

Properly securing conduits with straps and fittings is essential for maintaining the stability and safety of the installation. Conduits, which are used to protect and route electrical wiring, must be anchored securely to prevent movement and potential damage to the wiring they enclose. If conduits are not adequately secured, they may sag or become dislodged, which can lead to bending, kinking, or even electrical faults that may pose safety hazards.

Straps and fittings help distribute the weight of the conduits and protect them from environmental stresses, such as vibrations or mechanical impacts that can occur during the normal operation of a building. By using appropriate securing methods, installers ensure that the conduits remain firmly in place, reducing the risks of wear and damage over time.

Other practices listed, like using a mix of different types of fittings, may not necessarily enhance stability and could introduce complexities into the installation. Locating boxes at frequent intervals and using shorter lengths of conduit may offer advantages in other aspects, but these practices do not directly address the critical need for secure fastening, which is fundamental to the integrity of the entire conduit system.