Which item is necessary for the continuous inspection of cable installations in a riser?

The necessity of the manufacturer's installation instructions for the continuous inspection of cable installations in a riser arises from the specific guidelines these documents provide. These instructions contain crucial information regarding the proper installation techniques, cable handling requirements, and any special considerations unique to the specific type of cable being installed. Adhering to these guidelines is essential for ensuring the safety and reliability of the installation, as well as maintaining compliance with relevant codes and standards.

While the other options can provide useful information, they do not specifically address the ongoing requirements for inspection during installation. Wiring diagrams help visualize the electrical system but do not guide the inspection processes themselves. Bending radius charts are important for understanding the physical constraints of cable installation, but they do not cover the procedural aspects that the manufacturer's instructions do. Voltage drop calculations are relevant for determining the efficiency of the system, but they are not focused on installation practices or inspections. Thus, the manufacturer's installation instructions are vital for ensuring proper cable installation and ongoing compliance checks.