In regards to service disconnects, what is the differentiating factor for multiple installations?

The correct choice emphasizes that service disconnects must be grouped in a single location when multiple installations are present. This requirement aligns with safety and accessibility standards established by the National Electrical Code (NEC). Having service disconnects in one location ensures that they can be easily accessed and operated during emergencies, maintenance, or servicing. This centralized arrangement helps improve safety, as it reduces the time needed to shut off power in case of a fault or other dangerous situation.

Grouping disconnects in a single location also facilitates compliance with code requirements, ensuring proper labeling and easier identification of each disconnect for anyone working on or around the electrical system. By having disconnects consolidated, it minimizes confusion and enhances operational efficiency.

Other options may imply different arrangements or numbers of disconnects that do not necessarily align with the NEC's emphasis on safety and operational practicality. Therefore, grouping service disconnects in one location serves a critical purpose in residential electrical installations, providing a clear method for managing electrical service safely and effectively.