For service-drop cables supported on and cabled together with a grounded bare messenger wire, the vertical clearance should be at least _____ feet at the electrical service entrance to buildings.

The requirement for vertical clearance of service-drop cables supported on and cabled together with a grounded bare messenger wire is set to ensure safety, preventing electrical hazards and allowing adequate space for maintenance and other structures. The proper vertical clearance at the electrical service entrance to buildings must be at least 10 feet. This height minimizes the risk of accidental contact with the cables by people or equipment and helps to mitigate the effects of environmental factors, such as snow or ice accumulation, that could cause the cables to sag.

Ensuring a minimum clearance of 10 feet aligns with safety regulations and standards, emphasizing the importance of accessible routes and safe distances in electrical service installations. Thus, this specification is critical for both safety and compliance with electrical codes.