Which installation method should be used to minimize fire risk in vertical shafts?

The installation method that should be used to minimize fire risk in vertical shafts is to install with fire-resistant methods. This approach is crucial in vertical shafts, as these spaces can facilitate the upward movement of smoke and flames. Fire-resistant methods include using materials and techniques that are specifically designed to prevent fire spread, such as fire-rated cables, conduits, and other protective measures that can contain potential fires within a defined area and limit the transfer of heat and flames.

Implementing fire-resistant installation methods not only enhances the safety of the building but also complies with various fire safety codes and regulations. These methods are essential in mitigating the potential hazards associated with fire in vertical spaces, ensuring the overall integrity and protection of the building's electrical systems and contributing to the safety of its occupants.

Other methods, such as placing conductors loosely, using plastic conduits, or opting for shorter cable runs, may not adequately address the fire risks present in vertical shafts. They might limit other aspects of safety or flexibility without significantly reducing the potential for fire spread, making fire-resistant methods the preferred choice in this context.