Click on the following link to view RISBC-5 Rhode Island Electrical Code Title 5 as shown below: https://rules.sos.ri.gov/regulations/part/510-00-00-5

210.25 Delete NEC^® Section 210.25 and substitute the following:

210.25 Branch Circuits in Buildings with More Than One Occupancy.

A. Dwelling Unit Branch Circuits. Branch circuits in each dwelling unit shall supply only loads within that dwelling unit or loads associated only with that dwelling unit.

B. Common Area Branch Circuits. Branch circuits installed for the purpose of lighting, central alarm, signal, communications, or other purposes for public or common areas of a two (2) family dwelling, a multifamily dwelling, or a multi occupancy building shall not be supplied from equipment that supplies an individual dwelling unit or tenant space.

1. Exception: Smoke/CO Alarms in Existing Three-Family Dwellings.

Branch circuits installed for the purpose of associated smoke and carbon monoxide detection required for three (3) family dwellings located in the common areas of a three (3) family dwelling shall be permitted to be supplied from equipment that supplies an individual dwelling unit. Written documentation shall be supplied that there will be no interruption in service to said common area smoke and carbon monoxide devices.

a. Modifications to Existing Electric Service. When the electric service to a three-family dwelling with branch circuits installed in accordance with section 210.25(B)(1) is upgraded, or an electric meter is added for any other purpose, said property shall comply with sections 210.25(A) and (B).