Which condition indicates that an intermediate pull may be necessary during installation?

The need for an intermediate pull during installation is primarily indicated by the presence of multiple 90-degree bends in the cable route. When fiber optic cables are installed, they need to be handled carefully to avoid excessive stress or damage that can result from tight bends. Each 90-degree bend introduces a risk of loss or damage to the fibers within the cable, which can degrade signal quality.

To manage these bends effectively, technicians may choose to perform an intermediate pull, which allows them to reduce the amount of tension on the cable and ensure it is installed correctly without exceeding the manufacturer's bend radius specifications. By creating a more manageable installation scenario, installers can mitigate the potential issues that arise from sharp bends and maintain the integrity of the fiber optic system.

The other options represent conditions that, while important to consider, do not specifically necessitate an intermediate pull in the same way that multiple 90-degree bends do. For instance, humid conditions and high temperatures can affect the installation environment but do not influence the physical routing of the cable as significantly as sharp bends do. Similarly, short lengths of cable do not typically require an intermediate pull, as there would be less tension and fewer routing challenges encountered.