Appendix ND (RD) Electric Energy Storage Provisions
Section ND101 (RD101) Scope
ND101.1 (RD101.1) General.
These provisions shall be applicable for new construction where solar-ready measures or an on-site solar PV system are required.
Section ND102 (RD102) General Definition
ENERGY STORAGE SYSTEM (ESS).
One or more devices, assembled together, capable of storing energy in order to supply electrical energy at a future time.
Section ND103 (RD103) Electrical Energy Storage
ND103.2 (RD103.2) Electrical energy storage energy capacity.
Each building shall have an ESS with a rated energy capacity of not less than 5 kWh with not fewer than four ESS-supplied branch circuits.
ND103.3 (RD103.3) Electrical energy storage system readiness.
Each building shall be energy-storage ready in accordance with Sections ND103.3.1 through ND103.4.
ND103.3.2 (RD103.3.2) System isolation equipment space.
Space shall be reserved to allow for the future installation of a transfer switch within 3 feet (305 mm) of the main panelboard. Raceways shall be installed between the panelboard and the transfer switch location to allow the connection of an ESS.
ND103.3.3 (RD103.3.3) Panelboard with backed-up load circuits.
A dedicated raceway shall be provided from the main service to a panelboard that supplies the branch circuits served by the ESS. All branch circuits are permitted to be supplied by the main service panel prior to the installation of an ESS. The trade size of the raceway shall be not less than 1 inch (25 mm). The panelboard that supplies the branch circuits shall be labeled, “Subpanel reserved for future battery energy storage system to supply essential loads.”
ND103.3.4 (RD103.3.4) Branch circuits served by the ESS.
Not fewer than four branch circuits shall be identified and have their source of supply collocated at a single panelboard supplied by the ESS. The following end uses shall be served by the branch circuits:
- 1.
A refrigerator.
- 2.
One lighting circuit near the primary egress.
- 3.
A sleeping room receptacle outlet.