Answer: Calculating cable pulling tension and sidewall pressure is critical for a safe and successful installation. The tension is the force exerted on the cable as it is pulled through a conduit, while sidewall pressure is the force the cable exerts on the inner wall of the conduit, especially at bends. Failure to correctly calculate these forces can lead to cable damage, such as stretching, insulation abrasion, or crushing, and can even cause equipment failure. By performing these calculations beforehand, engineers and technicians can select the appropriate pulling equipment, lubricants, and plan the pull direction to minimize stress on the cable and ensure a safe installation.