National Grid provides detailed guidelines for property owners requesting a second electric service under M.D.P.U. 1570, Tariff 7C. While the preferred approach is to serve a property through a single service point, separate services and meters may be installed for detached structures like ADUs, garages, or barns, assuming no safety issues arise. For attached buildings, second service points require special written approval from an Authority Having Jurisdiction (AHJ), such as a building inspector or fire marshal, confirming compliance with fire and building codes. This resource also explains cost responsibilities, illegal submetering practices, and definitions for key electrical service components.