1 Scope

1.1 These requirements evaluate the fire propagation characteristics of residential battery energy storage systems (BESS).

1.2 These requirements do not evaluate deflagration characteristics of residential ESS.

1.3 These requirements address fire hazards originating from the cells within the residential BESS and do not address external fire exposure for the residential BESS.

1.4 Though some toxic components may be present in the cell gas, these requirements do not constitute a comprehensive analysis of battery vent gas toxicity.

1.5 These requirements do not cover energy storage systems intended for non-residential use, commercial use, or industrial use that are greater than 20 kWh.

1.6 The scope of these requirements is limited to residential BESS intended for installation, operation and maintenance in accordance with:

1. a) The Standard for the Installation of Stationary Energy Storage Systems, NFPA 855;

2. b) The National Electrical Code, NFPA 70;

3. c) The Fire Code, NFPA 1;

4. d) The Standard for Energy Storage Systems and Equipment, UL 9540;

5. e) The Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1;

6. f) The General Requirements – Canadian Electrical Code, Part II, CSA C22.2 No. 0;

7. g) The National Electrical Safety Code, IEEE C2;

8. h) The International Fire Code, ICC IFC;

9. i) The International Residential Code, ICC IRC; and

10. j) Other codes affecting energy storage systems.