U.S. code adoption
California — energy & appliance code adoption
Yes — effectively. This page summarizes electrical (NEC), appliance-listing (UL 858), fire-code, and energy-storage (UL 9540 / NFPA 855) code adoption for California, with primary sources.
Is UL 858 required in California?
Yes — effectively. California requires fixed household appliances to be listed by a Nationally Recognized Testing Laboratory (NRTL), and UL 858 is the de-facto listing standard a household electric range must meet. Listing required by CEC; UL858 is the de-facto listing for household electric ranges.
Are NRTL-listed (UL / ETL / CSA) appliances required in California?
Yes. California's adopted code requires fixed electrical appliances to be listed by an NRTL (UL, ETL/Intertek, CSA, etc.) — CEC 110.3 / 422.6. Listed by an NRTL (UL, ETL, CSA, etc.) is required for fixed appliances.
Which edition of the NEC does California use?
California has adopted the 2020 edition of the National Electrical Code (NEC), effective 2023-01-01.
Is UL 9540 required for residential energy storage in California?
Yes. California's adopted code requires UL 9540 listing for stationary energy storage systems (ESS) in dwellings. California is the only state that explicitly mandates UL 9540A large-scale fire testing for ESS — CFC §1207 + CAL FIRE / OSFM enforcement, no opt-out for residential.
Is UL 9540A fire-propagation testing required in California?
Yes. California's adopted code requires UL 9540A listing for energy storage systems.
What is the residential energy-storage capacity limit in California?
California limits residential energy storage to 20 kWh per dwelling unit.
Which fire code does California enforce?
California enforces IFC 2022. California Fire Code
Code adoption summary
| NEC edition | 2020 NEC |
|---|---|
| Appliance listing (UL 858) | Effectively required |
| NRTL listing requirement | Required |
| Fire code | IFC 2022 |
| IRC edition | 2021 IRC |
| UL 9540 (residential ESS) | Required |
| UL 9540A propagation test | Required |
| Residential ESS cap | 20 kWh / dwelling |
| NFPA 855 edition | 2020 |
Local authorities in California
Sources
- NFPA — NEC enforcement maps
- California Building Standards Commission
- 2022 California Fire Code §1207 (BSC / CAL FIRE)
- Office of the State Fire Marshal — CAL FIRE
- DSIRE Insight — Plug-In Legislation
- CA AB 1772 (2023-2024) — Powered mobility devices: lithium-ion batteries