What is the optional maintenance inspection for medium- and high-voltage shielded cable according to NETA specifications?

The correct answer is the maintenance inspection related to the physical condition of medium- and high-voltage shielded cable.

This inspection assesses the overall integrity and condition of the cable, which includes checking for any signs of wear, damage, or deterioration that could affect the cable's performance. Evaluating the physical condition is crucial because it helps identify potential issues that could lead to failures or safety hazards.

While insulation resistance testing, terminal connections, and fireproofing are all important aspects of cable maintenance and inspections, they fall into specific categories of testing and checks rather than being comprehensive for maintenance inspection as stated in the context of the question. Insulation resistance testing focuses on the effectiveness of the insulation material, terminal connections check for proper connectivity and tightness, and fireproofing pertains to the protective measures against fire hazards. Therefore, assessing the physical condition of the cable is the most relevant for the overall maintenance inspection as specified by NETA.